12ft Tesla coil: Get yours NOW!!
J. Aaron Holmes, Tue Aug 14 2007, 05:58AMYes, I know this is technically a "for sale", but since nobody here will be buying it and it's a Tesla coil, it seemed better off in this forum.
Click here for a good laugh.
Ahh-ha-ha-ha-haaaaAAAAAAAA!!! Ok, now this has to be about the worst/funniest/most pathetic example of an eBay Tesla coil sale I have EVER SEEN! It's quite clear the builder (probably the seller) had no idea what he was doing when he built it. My favorite parts are too numerous to list, but here are a few of them:
* The fact that the condition is listed as "new".
* The hideous 24:1 aspect ratio of the secondary.
* The primary and base, which look like souped-up versions of everybody's hackiest, most hastily thrown-together shop projects <shrug> ... but I'd never try selling my hackiest, most hastily thrown-together shop projects!
* The claim of 20' "arcs of lightning". Yeah...maybe if it tips into some overhead power lines!
* And last but not least: "I will sell the stand, the secondary coil, and a 10,500 volt neon sign transformer for $4,700"
Well...I don't know what more to say.
EDIT: Oh wait! I forgot:
* The topload that looks like a metalized shrimp pot buoy.
Cheers,
Aaron, N7OE
Re: 12ft Tesla coil: Get yours NOW!!
Kizmo, Tue Aug 14 2007, 06:03AM
URL doesn't work
Kizmo, Tue Aug 14 2007, 06:03AM
URL doesn't work
Re: 12ft Tesla coil: Get yours NOW!!
J. Aaron Holmes, Tue Aug 14 2007, 06:08AM
I fixed it. Sorry 'bout that!
J. Aaron Holmes, Tue Aug 14 2007, 06:08AM
Kizmo wrote ...
URL doesn't work
URL doesn't work
I fixed it. Sorry 'bout that!
Re: 12ft Tesla coil: Get yours NOW!!
Bennem, Tue Aug 14 2007, 06:58AM
LMAO
Yes...24:1 ratio is a bit much!
i would have at least gone for 22:1........
and used someone with 'sight' to wind it!
Mel
Bennem, Tue Aug 14 2007, 06:58AM
LMAO
Yes...24:1 ratio is a bit much!
i would have at least gone for 22:1........
and used someone with 'sight' to wind it!
Mel
Re: 12ft Tesla coil: Get yours NOW!!
Experimentonomen, Tue Aug 14 2007, 07:50AM
LOL
Experimentonomen, Tue Aug 14 2007, 07:50AM
LOL
Re: 12ft Tesla coil: Get yours NOW!!
sparky, Tue Aug 14 2007, 08:46AM
oh dear! What a waste...
sparky, Tue Aug 14 2007, 08:46AM
oh dear! What a waste...
Re: 12ft Tesla coil: Get yours NOW!!
ragnar, Tue Aug 14 2007, 08:51AM
Hehe, well spotted Aaron.
How about you leave him a question asking if he has photos of it working, and see if he passes off another coil as his own. =P
ragnar, Tue Aug 14 2007, 08:51AM
Hehe, well spotted Aaron.
How about you leave him a question asking if he has photos of it working, and see if he passes off another coil as his own. =P
Re: 12ft Tesla coil: Get yours NOW!!
Kizmo, Tue Aug 14 2007, 10:31AM
Just take saw and cut that in 8 or 9 equal pieces, that would work :)
Kizmo, Tue Aug 14 2007, 10:31AM
Just take saw and cut that in 8 or 9 equal pieces, that would work :)
Re: 12ft Tesla coil: Get yours NOW!!
Dr. Slack, Tue Aug 14 2007, 12:45PM
I would say go hit the "Make Offer" button, but I'm not certain it would accept negative numbers.
According to his feedback, he bought a 10lb spool of #28 wire at the end of June, so his flirtation with TCs didn't last too long.
He says "when properly tuned, is capable of producing 20' arcs". Translation - "I'd hoped for 20ft arcs, it doesn't work, somebody then mentioned tuning, I wonder what tuning is, there's nothing called tuning on eBay.
Oviously a sad case of "red Sports car envy".
Dr. Slack, Tue Aug 14 2007, 12:45PM
I would say go hit the "Make Offer" button, but I'm not certain it would accept negative numbers.
According to his feedback, he bought a 10lb spool of #28 wire at the end of June, so his flirtation with TCs didn't last too long.
He says "when properly tuned, is capable of producing 20' arcs". Translation - "I'd hoped for 20ft arcs, it doesn't work, somebody then mentioned tuning, I wonder what tuning is, there's nothing called tuning on eBay.
Oviously a sad case of "red Sports car envy".
Re: 12ft Tesla coil: Get yours NOW!!
J. Aaron Holmes, Tue Aug 14 2007, 02:47PM
)
Aaron
J. Aaron Holmes, Tue Aug 14 2007, 02:47PM
NeilThomas wrote ...
According to his feedback, he bought a 10lb spool of #28 wire at the end of June, so his flirtation with TCs didn't last too long.
Yes, I noticed that too and reached the same conclusion (originally I was checking his feedback to see what he normally charges for the junk he sells, and the wire purchase just jumped out at me). What's makes this even more pathetic is that somebody could build something like this so recently with all the great coiling resources online (i.e., all the stuff that tells you not to build things they way he built them According to his feedback, he bought a 10lb spool of #28 wire at the end of June, so his flirtation with TCs didn't last too long.
)NeilThomas wrote ...
He says "when properly tuned, is capable of producing 20' arcs". Translation - "I'd hoped for 20ft arcs, it doesn't work, somebody then mentioned tuning, I wonder what tuning is, there's nothing called tuning on eBay.
Hehehh... "I've got this tuner, but it just seems to bounce around between 'flat' and 'sharp' while I've got the coil running. I think the spark gap noise might be getting in the way. Hmmm..."He says "when properly tuned, is capable of producing 20' arcs". Translation - "I'd hoped for 20ft arcs, it doesn't work, somebody then mentioned tuning, I wonder what tuning is, there's nothing called tuning on eBay.
Aaron
Re: 12ft Tesla coil: Get yours NOW!!
Shaun, Tue Aug 14 2007, 04:42PM
Hmmmmm, so if a 12 inch secondary gives me 500kV, then 12 12 inch secondaries in series should give me... 6 million volts!! At 1kV per mm, that's like 20ft arcs of lightning!!!!
See, this would not have happened if this poor, deluded fellow was a member of 4HV. By now he might have even cobbled together a working coil...
Shaun, Tue Aug 14 2007, 04:42PM
Hmmmmm, so if a 12 inch secondary gives me 500kV, then 12 12 inch secondaries in series should give me... 6 million volts!! At 1kV per mm, that's like 20ft arcs of lightning!!!!
See, this would not have happened if this poor, deluded fellow was a member of 4HV. By now he might have even cobbled together a working coil...
Re: 12ft Tesla coil: Get yours NOW!!
ShawnLG, Tue Aug 14 2007, 04:56PM
OMG! He used over half of the spool! LOL. 5lb of #28 is 9945 ft. of wire.
"oh dear! What a waste..."
Think of the time he wasted winding that 12ft coil.
ShawnLG, Tue Aug 14 2007, 04:56PM
OMG! He used over half of the spool! LOL. 5lb of #28 is 9945 ft. of wire.
"oh dear! What a waste..."
Think of the time he wasted winding that 12ft coil.
Re: 12ft Tesla coil: Get yours NOW!!
GreySoul, Tue Aug 14 2007, 06:07PM
...hrm... I couldnt resist... I had to contact the seller and ask what was up.
I offered him $10 for the coil, NST, and stand...
Maybe I'll get lucky and win big!
GreySoul, Tue Aug 14 2007, 06:07PM
...hrm... I couldnt resist... I had to contact the seller and ask what was up.
I offered him $10 for the coil, NST, and stand...
Maybe I'll get lucky and win big!
Re: 12ft Tesla coil: Get yours NOW!!
J. Aaron Holmes, Tue Aug 14 2007, 06:20PM
Perhaps his "no way!" response will reveal how much *he* paid for the stuff. That could be just as entertaining
Cheers,
Aaron, N7OE
J. Aaron Holmes, Tue Aug 14 2007, 06:20PM
GreySoul wrote ...
...hrm... I couldnt resist... I had to contact the seller and ask what was up.
I offered him $10 for the coil, NST, and stand...
Maybe I'll get lucky and win big!
...hrm... I couldnt resist... I had to contact the seller and ask what was up.
I offered him $10 for the coil, NST, and stand...
Maybe I'll get lucky and win big!
Perhaps his "no way!" response will reveal how much *he* paid for the stuff. That could be just as entertaining
Cheers,
Aaron, N7OE
Re: 12ft Tesla coil: Get yours NOW!!
Experimentonomen, Tue Aug 14 2007, 06:22PM
Haha:D
Experimentonomen, Tue Aug 14 2007, 06:22PM
Haha:D
Re: 12ft Tesla coil: Get yours NOW!!
ShawnLG, Tue Aug 14 2007, 07:10PM
I did some math to find out the resonant frequency of this coil in ideal conditions. The "Q" is really bad. The coil it's self has more surface capacitance than the topload.
Secondary inducance: 0.8H (Henries not MicroHenries)
Topload: 31pF
Resonant frequency: 31.9khz
ShawnLG, Tue Aug 14 2007, 07:10PM
I did some math to find out the resonant frequency of this coil in ideal conditions. The "Q" is really bad. The coil it's self has more surface capacitance than the topload.
Secondary inducance: 0.8H (Henries not MicroHenries)
Topload: 31pF
Resonant frequency: 31.9khz
Re: 12ft Tesla coil: Get yours NOW!!
Myke, Tue Aug 14 2007, 09:48PM
lol. Hmm... near audio resonant frequency Tesla coil. Wow 0.8H air coil.
Myke, Tue Aug 14 2007, 09:48PM
lol. Hmm... near audio resonant frequency Tesla coil. Wow 0.8H air coil.Re: 12ft Tesla coil: Get yours NOW!!
ragnar, Tue Aug 14 2007, 10:48PM
Sure...
ragnar, Tue Aug 14 2007, 10:48PM
wrote ...
"I don't have any pics of the coil running. It was not completed past the secondary and the stand. I did not have room for it and did not have good caps, transformer, and toroid. A coil with this many turns should produce extremely long streamers if tuned correctly. but will requir a powerful transformer to overcome resistance and a much larger toroid or sphere. as long as the winding is intact it should work if tuned right."
"I don't have any pics of the coil running. It was not completed past the secondary and the stand. I did not have room for it and did not have good caps, transformer, and toroid. A coil with this many turns should produce extremely long streamers if tuned correctly. but will requir a powerful transformer to overcome resistance and a much larger toroid or sphere. as long as the winding is intact it should work if tuned right."
Sure...
Re: 12ft Tesla coil: Get yours NOW!!
Coronafix, Tue Aug 14 2007, 11:57PM
Oh My God!! Funniest thing I've seen in weeks.
11,500 turns!!!??!! The resistance alone in that thing would be extreme.
Without the secondary, $3200 seems a fair price for a 10.5kV NST and
that state of the art stand with primary.
Coronafix, Tue Aug 14 2007, 11:57PM
Oh My God!! Funniest thing I've seen in weeks.
11,500 turns!!!??!! The resistance alone in that thing would be extreme.
Without the secondary, $3200 seems a fair price for a 10.5kV NST and
that state of the art stand with primary.
Re: 12ft Tesla coil: Get yours NOW!!
Marko, Wed Aug 15 2007, 01:11AM
Blackplasma, how don't you understand.. more turns => bigger streamers
Huh!
Marko, Wed Aug 15 2007, 01:11AM
BlackPlasma wrote ...
Sure...
wrote ...
"I don't have any pics of the coil running. It was not completed past the secondary and the stand. I did not have room for it and did not have good caps, transformer, and toroid. A coil with this many turns should produce extremely long streamers if tuned correctly. but will requir a powerful transformer to overcome resistance and a much larger toroid or sphere. as long as the winding is intact it should work if tuned right."
"I don't have any pics of the coil running. It was not completed past the secondary and the stand. I did not have room for it and did not have good caps, transformer, and toroid. A coil with this many turns should produce extremely long streamers if tuned correctly. but will requir a powerful transformer to overcome resistance and a much larger toroid or sphere. as long as the winding is intact it should work if tuned right."
Sure...
Blackplasma, how don't you understand.. more turns => bigger streamers
Huh!
Re: 12ft Tesla coil: Get yours NOW!!
Mwahahaha, Wed Aug 15 2007, 04:53AM
To be more specific I used 95% of that roll of wire and it took me 4 days to finish it.
NO SALE
(by the way you offered me $5)
[Edit: No double posting]
Mwahahaha, Wed Aug 15 2007, 04:53AM
ShawnLG wrote ...
OMG! He used over half of the spool! LOL. 5lb of #28 is 9945 ft. of wire.
"oh dear! What a waste..."
Think of the time he wasted winding that 12ft coil.
OMG! He used over half of the spool! LOL. 5lb of #28 is 9945 ft. of wire.
"oh dear! What a waste..."
Think of the time he wasted winding that 12ft coil.
To be more specific I used 95% of that roll of wire and it took me 4 days to finish it.
GreySoul wrote ...
...hrm... I couldnt resist... I had to contact the seller and ask what was up.
I offered him $10 for the coil, NST, and stand...
Maybe I'll get lucky and win big!
In case you wondering...hrm... I couldnt resist... I had to contact the seller and ask what was up.
I offered him $10 for the coil, NST, and stand...
Maybe I'll get lucky and win big!
NO SALE
(by the way you offered me $5)
[Edit: No double posting]
Re: 12ft Tesla coil: Get yours NOW!!
Dr. Slack, Wed Aug 15 2007, 07:11AM
Well, you have to admire his balls for showing up.
Hi Mwahahaha, a couple of questions, as I'm intrigued.
Given that you obviously picked up enough info (from the net presumably) to know about the components, how come you settled on the 12ft x 6inch design for the secondary, when a little more digging on any reputable source, Pupman, here, or using any sort of TC calculator, gives an aspect ratio of like 4 (+/-1) :1 and around 1000 turns as being a good place to start?
Why give up now after all that effort? If you are short of good caps, then beer bottle caps are free and will get you going (OK, drinking all that beer is a tedious rotten job, but somebody has to do it!)
If your only crime is devoting money and building time before having done enough homework, then hey, we're all been sinners at some time, me particularly. Stick around, ask some questions. Maybe buy some 942s, maybe empty some bottles. Cut the secondary into several pieces, unwind one back to 24" and sell the others (there's no way anybody will buy 12ft, but they might buy a 3ft ready wound secondary, even if the wire is a bit thinner and the number of turns a bit higher than ideal). You may get your TC going after all.
<preach> Show an ability to learn and I've no doubt that the laughter will stop. This is a great forum for rational members who do their homework </preach>
Dr. Slack, Wed Aug 15 2007, 07:11AM
Well, you have to admire his balls for showing up.
Hi Mwahahaha, a couple of questions, as I'm intrigued.
Given that you obviously picked up enough info (from the net presumably) to know about the components, how come you settled on the 12ft x 6inch design for the secondary, when a little more digging on any reputable source, Pupman, here, or using any sort of TC calculator, gives an aspect ratio of like 4 (+/-1) :1 and around 1000 turns as being a good place to start?
Why give up now after all that effort? If you are short of good caps, then beer bottle caps are free and will get you going (OK, drinking all that beer is a tedious rotten job, but somebody has to do it!)
If your only crime is devoting money and building time before having done enough homework, then hey, we're all been sinners at some time, me particularly. Stick around, ask some questions. Maybe buy some 942s, maybe empty some bottles. Cut the secondary into several pieces, unwind one back to 24" and sell the others (there's no way anybody will buy 12ft, but they might buy a 3ft ready wound secondary, even if the wire is a bit thinner and the number of turns a bit higher than ideal). You may get your TC going after all.
<preach> Show an ability to learn and I've no doubt that the laughter will stop. This is a great forum for rational members who do their homework </preach>
Re: 12ft Tesla coil: Get yours NOW!!
Tom540, Wed Aug 15 2007, 03:31PM
LOL I was going to post this auction here the other day.
Tom540, Wed Aug 15 2007, 03:31PM
LOL I was going to post this auction here the other day.
Re: 12ft Tesla coil: Get yours NOW!!
GreySoul, Wed Aug 15 2007, 05:10PM
I doubt he'll be back. it's probably just a scam. I bet he's in cahoots with the Info Horribly Limited guy.
Oh, and yeah, I offered $5 for the coil, $10 was for the shipping :P my bad...
take $20 for everything?
[edit]
I see he added this disclaimer:
hey, with enough input power just about anything is possible....
But I still don't think you'd get anything out of it as presented (10 turn helical primary, no cap!, 10.5KV NST). And a 20' arc? Really? I've seen HUGE coils that can throw a 20' arc running at 15+ KVA, but they were still 5:1 and maybe 1200 turns of really heavy gauge wire... this is just junk on a pipe. Even the suggestion that a 20' streamer is possible with this coil borders on fraudulent, and is at the very least misinformed.
The guy might have better luck if he tried to sell it as an antenna.... or a sewer pipe.
*shrug* this is fun :)
-Doug again
GreySoul, Wed Aug 15 2007, 05:10PM
I doubt he'll be back. it's probably just a scam. I bet he's in cahoots with the Info Horribly Limited guy.
Oh, and yeah, I offered $5 for the coil, $10 was for the shipping :P my bad...
take $20 for everything?
[edit]
I see he added this disclaimer:
ebay wrote ...
On Aug-14-07 at 21:06:25 PDT, seller added the following information:
This secondary is not guarenteed [sic] to produce 20+ foot streamers. With 11,500 turns it should be able to though.
On Aug-14-07 at 21:06:25 PDT, seller added the following information:
This secondary is not guarenteed [sic] to produce 20+ foot streamers. With 11,500 turns it should be able to though.
hey, with enough input power just about anything is possible....
But I still don't think you'd get anything out of it as presented (10 turn helical primary, no cap!, 10.5KV NST). And a 20' arc? Really? I've seen HUGE coils that can throw a 20' arc running at 15+ KVA, but they were still 5:1 and maybe 1200 turns of really heavy gauge wire... this is just junk on a pipe. Even the suggestion that a 20' streamer is possible with this coil borders on fraudulent, and is at the very least misinformed.
The guy might have better luck if he tried to sell it as an antenna.... or a sewer pipe.
*shrug* this is fun :)
-Doug again
Re: 12ft Tesla coil: Get yours NOW!!
Mwahahaha, Wed Aug 15 2007, 08:48PM
How does $1300 sound?
Mwahahaha, Wed Aug 15 2007, 08:48PM
GreySoul wrote ...
I doubt he'll be back. it's probably just a scam. I bet he's in cahoots with the Info Horribly Limited guy.
Oh, and yeah, I offered $5 for the coil, $10 was for the shipping :P my bad...
take $20 for everything?
[edit]
I see he added this disclaimer:
hey, with enough input power just about anything is possible....
But I still don't think you'd get anything out of it as presented (10 turn helical primary, no cap!, 10.5KV NST). And a 20' arc? Really? I've seen HUGE coils that can throw a 20' arc running at 15+ KVA, but they were still 5:1 and maybe 1200 turns of really heavy gauge wire... this is just junk on a pipe. Even the suggestion that a 20' streamer is possible with this coil borders on fraudulent, and is at the very least misinformed.
The guy might have better luck if he tried to sell it as an antenna.... or a sewer pipe.
*shrug* this is fun :)
-Doug again
I doubt he'll be back. it's probably just a scam. I bet he's in cahoots with the Info Horribly Limited guy.
Oh, and yeah, I offered $5 for the coil, $10 was for the shipping :P my bad...
take $20 for everything?
[edit]
I see he added this disclaimer:
ebay wrote ...
On Aug-14-07 at 21:06:25 PDT, seller added the following information:
This secondary is not guarenteed [sic] to produce 20+ foot streamers. With 11,500 turns it should be able to though.
On Aug-14-07 at 21:06:25 PDT, seller added the following information:
This secondary is not guarenteed [sic] to produce 20+ foot streamers. With 11,500 turns it should be able to though.
hey, with enough input power just about anything is possible....
But I still don't think you'd get anything out of it as presented (10 turn helical primary, no cap!, 10.5KV NST). And a 20' arc? Really? I've seen HUGE coils that can throw a 20' arc running at 15+ KVA, but they were still 5:1 and maybe 1200 turns of really heavy gauge wire... this is just junk on a pipe. Even the suggestion that a 20' streamer is possible with this coil borders on fraudulent, and is at the very least misinformed.
The guy might have better luck if he tried to sell it as an antenna.... or a sewer pipe.
*shrug* this is fun :)
-Doug again
How does $1300 sound?
Re: 12ft Tesla coil: Get yours NOW!!
Experimentonomen, Wed Aug 15 2007, 09:44PM
Mwahahaha, give it up, this stuff is NOT worth 1300$, an NST can be found at a fleamarket for maybe 10$, the secondary coil form can be had for free by dumpsterdiving, wire can be had for free too, otherwise it cost maybe 10-50$ and caps for an mmc can be had for as low as 10$ on ebay. Add all this together and you end at maybe a few hundred bucks as max, but nowhere near your 1300$, unless your NST is brand new which i highly doubt.
I also guess your secondary isent even coated in any laquer/varnish, meaning the turns will collapse over each other by expansion from changing temperature. your best off cutting your 12ft secondary down to several smaller ones like 15-20 inches long. as it is now the wire resistance will overcome the voltage produced and greatly reduce streamer lenght.
Experimentonomen, Wed Aug 15 2007, 09:44PM
Mwahahaha, give it up, this stuff is NOT worth 1300$, an NST can be found at a fleamarket for maybe 10$, the secondary coil form can be had for free by dumpsterdiving, wire can be had for free too, otherwise it cost maybe 10-50$ and caps for an mmc can be had for as low as 10$ on ebay. Add all this together and you end at maybe a few hundred bucks as max, but nowhere near your 1300$, unless your NST is brand new which i highly doubt.
I also guess your secondary isent even coated in any laquer/varnish, meaning the turns will collapse over each other by expansion from changing temperature. your best off cutting your 12ft secondary down to several smaller ones like 15-20 inches long. as it is now the wire resistance will overcome the voltage produced and greatly reduce streamer lenght.
Re: 12ft Tesla coil: Get yours NOW!!
GreySoul, Wed Aug 15 2007, 09:49PM
$1300 sounds like you need to seriously reconsider the value of your labor.
...
The pipe and wire MIGHT be worth $20 to someone if they needed the pipe OR the wire, and were going to toss the other. Your labor isn't of any value in that case.
The copper is probably worth $5-6 to a recycler.
As 5 smaller coils it may be worth $50-80 each, but the ebay market is already saturated with 6" pre-wound coils. that already includes the labor.
The ellipsoid topload is worth maybe $10 - it's clearly 2 bowls attached to each other... or is it something else? in any case, a toroid would be preferable. Again, labor might be worth an extra $5-10 to someone... but a nice spun aluminum toroid is where people with money go for their top loads.
The base is really not all that impressive. It looks decently well built, and I apologize for my dissing on it';s construction... but it's worth maybe $50 in wood and part, and .... maybe took an hour or two to build.... I'd say maybe get $75 for it, if someone wants to buy rather than build.
the primary coil is only worth somethign if it's tuned to the coil you're selling... and even then it's worth maybe $20.
The Neon Sign Transformer, at 10.5KV and not knowing it's design or power rating it close to worthless.
if it's a 90ma old style NST you can probably get $40-60 at a hamfest if it's in good shape, maybe a little more on ebay if you get the right day and buyer.
If it's a brand new iron core NST it's worth a bit more...
If it's a high frequency modern NST with circuit protection built in it's worthless for coil use.
Whatever capacitor you have is not clear - if it's a beer bottle cap it's hard to value - the beer inside is gone....And you can't really demand payment for drinking the beer....Still, I'd probably pay $100 for a well built working bottle cap demo unit (no, I don't need one, thanks everyone)
if it's a well built MMC then it could be worth $100-200 or maybe more if it's a large well made MMC.
...so honestly, since you seem a little more legitimate than the average fly-by-night scammer... you've come back, that says a lot to me...
Why do you think that coil is worth so much, or why are you asking so much if you know it's not?
-Doug
GreySoul, Wed Aug 15 2007, 09:49PM
$1300 sounds like you need to seriously reconsider the value of your labor.
...
The pipe and wire MIGHT be worth $20 to someone if they needed the pipe OR the wire, and were going to toss the other. Your labor isn't of any value in that case.
The copper is probably worth $5-6 to a recycler.
As 5 smaller coils it may be worth $50-80 each, but the ebay market is already saturated with 6" pre-wound coils. that already includes the labor.
The ellipsoid topload is worth maybe $10 - it's clearly 2 bowls attached to each other... or is it something else? in any case, a toroid would be preferable. Again, labor might be worth an extra $5-10 to someone... but a nice spun aluminum toroid is where people with money go for their top loads.
The base is really not all that impressive. It looks decently well built, and I apologize for my dissing on it';s construction... but it's worth maybe $50 in wood and part, and .... maybe took an hour or two to build.... I'd say maybe get $75 for it, if someone wants to buy rather than build.
the primary coil is only worth somethign if it's tuned to the coil you're selling... and even then it's worth maybe $20.
The Neon Sign Transformer, at 10.5KV and not knowing it's design or power rating it close to worthless.
if it's a 90ma old style NST you can probably get $40-60 at a hamfest if it's in good shape, maybe a little more on ebay if you get the right day and buyer.
If it's a brand new iron core NST it's worth a bit more...
If it's a high frequency modern NST with circuit protection built in it's worthless for coil use.
Whatever capacitor you have is not clear - if it's a beer bottle cap it's hard to value - the beer inside is gone....And you can't really demand payment for drinking the beer....Still, I'd probably pay $100 for a well built working bottle cap demo unit (no, I don't need one, thanks everyone)
if it's a well built MMC then it could be worth $100-200 or maybe more if it's a large well made MMC.
...so honestly, since you seem a little more legitimate than the average fly-by-night scammer... you've come back, that says a lot to me...
Why do you think that coil is worth so much, or why are you asking so much if you know it's not?
-Doug
Re: 12ft Tesla coil: Get yours NOW!!
Shaun, Wed Aug 15 2007, 10:06PM
It's only worth as much as somebody is willing to pay for it; in this case I thinks that's, what, $5-20? lol but seriously you should scrap the base+topload and just cut up the secondary and either use the pieces or sell them.
Trust me, the people on this forum know EXACTLY what they are talking about.
Shaun, Wed Aug 15 2007, 10:06PM
It's only worth as much as somebody is willing to pay for it; in this case I thinks that's, what, $5-20? lol but seriously you should scrap the base+topload and just cut up the secondary and either use the pieces or sell them.
Trust me, the people on this forum know EXACTLY what they are talking about.
Re: 12ft Tesla coil: Get yours NOW!!
GreySoul, Wed Aug 15 2007, 11:48PM
I refute your accusation and suggest that 7 + 12 = 9
GreySoul, Wed Aug 15 2007, 11:48PM
Shaun wrote ...
Trust me, the people on this forum know EXACTLY what they are talking about.
Trust me, the people on this forum know EXACTLY what they are talking about.
I refute your accusation and suggest that 7 + 12 = 9
Re: 12ft Tesla coil: Get yours NOW!!
Mwahahaha, Thu Aug 16 2007, 01:38AM
Its is coated with several layers of varnish
Mwahahaha, Thu Aug 16 2007, 01:38AM
HFsstc-freak wrote ...
Mwahahaha, give it up, this stuff is NOT worth 1300$, an NST can be found at a fleamarket for maybe 10$, the secondary coil form can be had for free by dumpsterdiving, wire can be had for free too, otherwise it cost maybe 10-50$ and caps for an mmc can be had for as low as 10$ on ebay. Add all this together and you end at maybe a few hundred bucks as max, but nowhere near your 1300$, unless your NST is brand new which i highly doubt.
I also guess your secondary isent even coated in any laquer/varnish, meaning the turns will collapse over each other by expansion from changing temperature. your best off cutting your 12ft secondary down to several smaller ones like 15-20 inches long. as it is now the wire resistance will overcome the voltage produced and greatly reduce streamer lenght.
Mwahahaha, give it up, this stuff is NOT worth 1300$, an NST can be found at a fleamarket for maybe 10$, the secondary coil form can be had for free by dumpsterdiving, wire can be had for free too, otherwise it cost maybe 10-50$ and caps for an mmc can be had for as low as 10$ on ebay. Add all this together and you end at maybe a few hundred bucks as max, but nowhere near your 1300$, unless your NST is brand new which i highly doubt.
I also guess your secondary isent even coated in any laquer/varnish, meaning the turns will collapse over each other by expansion from changing temperature. your best off cutting your 12ft secondary down to several smaller ones like 15-20 inches long. as it is now the wire resistance will overcome the voltage produced and greatly reduce streamer lenght.
Its is coated with several layers of varnish
Re: 12ft Tesla coil: Get yours NOW!!
Mwahahaha, Thu Aug 16 2007, 01:46AM
6 inch dia 13 foot pvc pipe: $50
10 lb roll of 28 AWG magnet wire: $50
Can of Varnish: $10
Labor: $150-$200
12 foot Secondary: Priceless
Mwahahaha, Thu Aug 16 2007, 01:46AM
GreySoul wrote ...
$1300 sounds like you need to seriously reconsider the value of your labor.
...
The pipe and wire MIGHT be worth $20 to someone if they needed the pipe OR the wire, and were going to toss the other. Your labor isn't of any value in that case.
The copper is probably worth $5-6 to a recycler.
As 5 smaller coils it may be worth $50-80 each, but the ebay market is already saturated with 6" pre-wound coils. that already includes the labor.
The ellipsoid topload is worth maybe $10 - it's clearly 2 bowls attached to each other... or is it something else? in any case, a toroid would be preferable. Again, labor might be worth an extra $5-10 to someone... but a nice spun aluminum toroid is where people with money go for their top loads.
The base is really not all that impressive. It looks decently well built, and I apologize for my dissing on it';s construction... but it's worth maybe $50 in wood and part, and .... maybe took an hour or two to build.... I'd say maybe get $75 for it, if someone wants to buy rather than build.
the primary coil is only worth somethign if it's tuned to the coil you're selling... and even then it's worth maybe $20.
The Neon Sign Transformer, at 10.5KV and not knowing it's design or power rating it close to worthless.
if it's a 90ma old style NST you can probably get $40-60 at a hamfest if it's in good shape, maybe a little more on ebay if you get the right day and buyer.
If it's a brand new iron core NST it's worth a bit more...
If it's a high frequency modern NST with circuit protection built in it's worthless for coil use.
Whatever capacitor you have is not clear - if it's a beer bottle cap it's hard to value - the beer inside is gone....And you can't really demand payment for drinking the beer....Still, I'd probably pay $100 for a well built working bottle cap demo unit (no, I don't need one, thanks everyone)
if it's a well built MMC then it could be worth $100-200 or maybe more if it's a large well made MMC.
...so honestly, since you seem a little more legitimate than the average fly-by-night scammer... you've come back, that says a lot to me...
Why do you think that coil is worth so much, or why are you asking so much if you know it's not?
-Doug
$1300 sounds like you need to seriously reconsider the value of your labor.
...
The pipe and wire MIGHT be worth $20 to someone if they needed the pipe OR the wire, and were going to toss the other. Your labor isn't of any value in that case.
The copper is probably worth $5-6 to a recycler.
As 5 smaller coils it may be worth $50-80 each, but the ebay market is already saturated with 6" pre-wound coils. that already includes the labor.
The ellipsoid topload is worth maybe $10 - it's clearly 2 bowls attached to each other... or is it something else? in any case, a toroid would be preferable. Again, labor might be worth an extra $5-10 to someone... but a nice spun aluminum toroid is where people with money go for their top loads.
The base is really not all that impressive. It looks decently well built, and I apologize for my dissing on it';s construction... but it's worth maybe $50 in wood and part, and .... maybe took an hour or two to build.... I'd say maybe get $75 for it, if someone wants to buy rather than build.
the primary coil is only worth somethign if it's tuned to the coil you're selling... and even then it's worth maybe $20.
The Neon Sign Transformer, at 10.5KV and not knowing it's design or power rating it close to worthless.
if it's a 90ma old style NST you can probably get $40-60 at a hamfest if it's in good shape, maybe a little more on ebay if you get the right day and buyer.
If it's a brand new iron core NST it's worth a bit more...
If it's a high frequency modern NST with circuit protection built in it's worthless for coil use.
Whatever capacitor you have is not clear - if it's a beer bottle cap it's hard to value - the beer inside is gone....And you can't really demand payment for drinking the beer....Still, I'd probably pay $100 for a well built working bottle cap demo unit (no, I don't need one, thanks everyone)
if it's a well built MMC then it could be worth $100-200 or maybe more if it's a large well made MMC.
...so honestly, since you seem a little more legitimate than the average fly-by-night scammer... you've come back, that says a lot to me...
Why do you think that coil is worth so much, or why are you asking so much if you know it's not?
-Doug
6 inch dia 13 foot pvc pipe: $50
10 lb roll of 28 AWG magnet wire: $50
Can of Varnish: $10
Labor: $150-$200
12 foot Secondary: Priceless
Re: 12ft Tesla coil: Get yours NOW!!
Mwahahaha, Thu Aug 16 2007, 01:49AM
Is there an equation that can find the resonant frequency of the primary and secondary coils.
Mwahahaha, Thu Aug 16 2007, 01:49AM
Is there an equation that can find the resonant frequency of the primary and secondary coils.
Re: 12ft Tesla coil: Get yours NOW!!
Mwahahaha, Thu Aug 16 2007, 02:04AM
I decided on the 6" dia 13 foot coil because i wanted to make the largest possible coil and the largest roll of magnet wire i could find was ten lbs. Any smaller than 28 Awg and it would break to easily. and any larger and i would require more than 10 lbs to coat the pipe. I thought about using an 8 inch diameter 13 foot pipe, but i couldn't find enough wire to coat it. As for the caps some are leyden jars made from mayonaise jars, the other is made from sheets of aluminum stacked between plates of 1/4 inch glass.
do you know where i can find a good resonant frequency equation for primary and secondary circuits.
Mwahahaha, Thu Aug 16 2007, 02:04AM
NeilThomas wrote ...
Well, you have to admire his balls for showing up.
Hi Mwahahaha, a couple of questions, as I'm intrigued.
Given that you obviously picked up enough info (from the net presumably) to know about the components, how come you settled on the 12ft x 6inch design for the secondary, when a little more digging on any reputable source, Pupman, here, or using any sort of TC calculator, gives an aspect ratio of like 4 (+/-1) :1 and around 1000 turns as being a good place to start?
Why give up now after all that effort? If you are short of good caps, then beer bottle caps are free and will get you going (OK, drinking all that beer is a tedious rotten job, but somebody has to do it!)
If your only crime is devoting money and building time before having done enough homework, then hey, we're all been sinners at some time, me particularly. Stick around, ask some questions. Maybe buy some 942s, maybe empty some bottles. Cut the secondary into several pieces, unwind one back to 24" and sell the others (there's no way anybody will buy 12ft, but they might buy a 3ft ready wound secondary, even if the wire is a bit thinner and the number of turns a bit higher than ideal). You may get your TC going after all.
<preach> Show an ability to learn and I've no doubt that the laughter will stop. This is a great forum for rational members who do their homework </preach>
Well, you have to admire his balls for showing up.
Hi Mwahahaha, a couple of questions, as I'm intrigued.
Given that you obviously picked up enough info (from the net presumably) to know about the components, how come you settled on the 12ft x 6inch design for the secondary, when a little more digging on any reputable source, Pupman, here, or using any sort of TC calculator, gives an aspect ratio of like 4 (+/-1) :1 and around 1000 turns as being a good place to start?
Why give up now after all that effort? If you are short of good caps, then beer bottle caps are free and will get you going (OK, drinking all that beer is a tedious rotten job, but somebody has to do it!)
If your only crime is devoting money and building time before having done enough homework, then hey, we're all been sinners at some time, me particularly. Stick around, ask some questions. Maybe buy some 942s, maybe empty some bottles. Cut the secondary into several pieces, unwind one back to 24" and sell the others (there's no way anybody will buy 12ft, but they might buy a 3ft ready wound secondary, even if the wire is a bit thinner and the number of turns a bit higher than ideal). You may get your TC going after all.
<preach> Show an ability to learn and I've no doubt that the laughter will stop. This is a great forum for rational members who do their homework </preach>
I decided on the 6" dia 13 foot coil because i wanted to make the largest possible coil and the largest roll of magnet wire i could find was ten lbs. Any smaller than 28 Awg and it would break to easily. and any larger and i would require more than 10 lbs to coat the pipe. I thought about using an 8 inch diameter 13 foot pipe, but i couldn't find enough wire to coat it. As for the caps some are leyden jars made from mayonaise jars, the other is made from sheets of aluminum stacked between plates of 1/4 inch glass.
do you know where i can find a good resonant frequency equation for primary and secondary circuits.
Re: 12ft Tesla coil: Get yours NOW!!
Mwahahaha, Thu Aug 16 2007, 02:23AM
when i put that coil on ebay i didn't really expect it to sell, but i've got to say i'm surprised that there was a forum thread created to make fun of it.
Mwahahaha, Thu Aug 16 2007, 02:23AM
J. Aaron Holmes wrote ...
Yes, I know this is technically a "for sale", but since nobody here will be buying it and it's a Tesla coil, it seemed better off in this forum.
Click here for a good laugh.
Ahh-ha-ha-ha-haaaaAAAAAAAA!!! Ok, now this has to be about the worst/funniest/most pathetic example of an eBay Tesla coil sale I have EVER SEEN! It's quite clear the builder (probably the seller) had no idea what he was doing when he built it. My favorite parts are too numerous to list, but here are a few of them:
* The fact that the condition is listed as "new".
* The hideous 24:1 aspect ratio of the secondary.
* The primary and base, which look like souped-up versions of everybody's hackiest, most hastily thrown-together shop projects <shrug> ... but I'd never try selling my hackiest, most hastily thrown-together shop projects!
* The claim of 20' "arcs of lightning". Yeah...maybe if it tips into some overhead power lines!
* And last but not least: "I will sell the stand, the secondary coil, and a 10,500 volt neon sign transformer for $4,700"
Well...I don't know what more to say.
EDIT: Oh wait! I forgot:
* The topload that looks like a metalized shrimp pot buoy.
Cheers,
Aaron, N7OE
Yes, I know this is technically a "for sale", but since nobody here will be buying it and it's a Tesla coil, it seemed better off in this forum.
Click here for a good laugh.
Ahh-ha-ha-ha-haaaaAAAAAAAA!!! Ok, now this has to be about the worst/funniest/most pathetic example of an eBay Tesla coil sale I have EVER SEEN! It's quite clear the builder (probably the seller) had no idea what he was doing when he built it. My favorite parts are too numerous to list, but here are a few of them:
* The fact that the condition is listed as "new".
* The hideous 24:1 aspect ratio of the secondary.
* The primary and base, which look like souped-up versions of everybody's hackiest, most hastily thrown-together shop projects <shrug> ... but I'd never try selling my hackiest, most hastily thrown-together shop projects!
* The claim of 20' "arcs of lightning". Yeah...maybe if it tips into some overhead power lines!
* And last but not least: "I will sell the stand, the secondary coil, and a 10,500 volt neon sign transformer for $4,700"
Well...I don't know what more to say.
EDIT: Oh wait! I forgot:
* The topload that looks like a metalized shrimp pot buoy.
Cheers,
Aaron, N7OE
when i put that coil on ebay i didn't really expect it to sell, but i've got to say i'm surprised that there was a forum thread created to make fun of it.
Re: 12ft Tesla coil: Get yours NOW!!
Mwahahaha, Thu Aug 16 2007, 02:27AM
if anybody is interested i also have a 24 inch 4 inch diameter coil for sale on ebay.
Mwahahaha, Thu Aug 16 2007, 02:27AM
if anybody is interested i also have a 24 inch 4 inch diameter coil for sale on ebay.
Re: 12ft Tesla coil: Get yours NOW!!
GreySoul, Thu Aug 16 2007, 02:40AM
Ok, first read the forum rules: NO double posting, let alone quintuple posting....
Second, what you paid for new materials and what they're worth after you've purposed them are two differnt things. I'm sorry you're getting the short end on this one, but consider it a lesson learned.
FWIW, I could wind a 12' coil in about an hour, and that includes setting up the lathe for a 12 foot bed.... I don't think your winding labor is worth $200/hr. manually wound coils are not a commercially viable product and shouldn't be sold as "new" unless they're completely flawless ... that's just my opinions, others may feel other ways.
I'm glad you didn't waste your time on an 8" coil.... 8" pipe isn't cheap.
...
And why did you bother to wind a coil without knowing anything about the theory behind them? A cursory search of google for "tesla coil calculators" should result in plenty of information. the 4hv wiki would also be a good place to start.
And why pay to list an itom on ebay if you don't plan to sell it?
... I dunno guy, seems like you're way ahead of yourself ... slow down and read up first. This is a great place to start.
a 24" x 4" coil could actually be useful....depending on the number of turns.
..anyways stop multi-posting. It's not good.
-Doug
GreySoul, Thu Aug 16 2007, 02:40AM
Ok, first read the forum rules: NO double posting, let alone quintuple posting....
Second, what you paid for new materials and what they're worth after you've purposed them are two differnt things. I'm sorry you're getting the short end on this one, but consider it a lesson learned.
FWIW, I could wind a 12' coil in about an hour, and that includes setting up the lathe for a 12 foot bed.... I don't think your winding labor is worth $200/hr. manually wound coils are not a commercially viable product and shouldn't be sold as "new" unless they're completely flawless ... that's just my opinions, others may feel other ways.
I'm glad you didn't waste your time on an 8" coil.... 8" pipe isn't cheap.
...
And why did you bother to wind a coil without knowing anything about the theory behind them? A cursory search of google for "tesla coil calculators" should result in plenty of information. the 4hv wiki would also be a good place to start.
And why pay to list an itom on ebay if you don't plan to sell it?
... I dunno guy, seems like you're way ahead of yourself ... slow down and read up first. This is a great place to start.
a 24" x 4" coil could actually be useful....depending on the number of turns.
..anyways stop multi-posting. It's not good.
-Doug
Re: 12ft Tesla coil: Get yours NOW!!
Dr. Slack, Thu Aug 16 2007, 06:02AM
Some of what you say has an element of reason behind it, but with only half the story you're coming to the wrong conclusion.
so ... if a transformer secondary produces x volts per turn, then you get a higher output voltage with more turns? Right? so more turns is more volts? right? Yes, if it's conventional transformer, that is strongly coupled and non-resonaant. Unfortunately, the Tesla coil is double tuned weakly coupled resonant system, and it has to be designed as a system. All parameters are significant, but Q is possibly one of the most so, and this needs few turns of thick wire. Whatever the size of the coil (disruptive spark), it seems that the best performance, in terms of best streamer length, is given when the number of turns is in the 1000 ballpark, though 800-1600 are not uncommon.
Doing what you've done is not a crime, but continuing to do it, once you've had the error of your ways pointed out, is. Enter the 12 step program. Say, "my name is Mwahahaha, and I don't fully understand the design principles of Tesla coils". I didn't understand once, to be honest I'm not sure I completely understand all the subtleties now. But I do know I need to learn.
I get off most on seeing people understand new things. Go on, do you and me a favour by waking up, recognising well meant criticism and guidance, and attempt to learn some more.
Dr. Slack, Thu Aug 16 2007, 06:02AM
Some of what you say has an element of reason behind it, but with only half the story you're coming to the wrong conclusion.
so ... if a transformer secondary produces x volts per turn, then you get a higher output voltage with more turns? Right? so more turns is more volts? right? Yes, if it's conventional transformer, that is strongly coupled and non-resonaant. Unfortunately, the Tesla coil is double tuned weakly coupled resonant system, and it has to be designed as a system. All parameters are significant, but Q is possibly one of the most so, and this needs few turns of thick wire. Whatever the size of the coil (disruptive spark), it seems that the best performance, in terms of best streamer length, is given when the number of turns is in the 1000 ballpark, though 800-1600 are not uncommon.
Doing what you've done is not a crime, but continuing to do it, once you've had the error of your ways pointed out, is. Enter the 12 step program. Say, "my name is Mwahahaha, and I don't fully understand the design principles of Tesla coils". I didn't understand once, to be honest I'm not sure I completely understand all the subtleties now. But I do know I need to learn.
I get off most on seeing people understand new things. Go on, do you and me a favour by waking up, recognising well meant criticism and guidance, and attempt to learn some more.
Re: 12ft Tesla coil: Get yours NOW!!
Bjørn, Thu Aug 16 2007, 06:23AM
This thread failed completely to stay on topic so it is closed.
In addition Mwahahaha managed to set an unbeatable record by posting 6 times in a row and advertising items for sale even if he does not have the required number of posts.
If anyone has something sensible and important to say or ask they can start a new on topic thread.
Bjørn, Thu Aug 16 2007, 06:23AM
This thread failed completely to stay on topic so it is closed.
In addition Mwahahaha managed to set an unbeatable record by posting 6 times in a row and advertising items for sale even if he does not have the required number of posts.
If anyone has something sensible and important to say or ask they can start a new on topic thread.
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