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Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
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>
Registered Member #546
Joined: Fri Feb 23 2007, 11:43PM
Location: Albuquerque, NM
Posts: 239
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.
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.
Registered Member #955
Joined: Wed Aug 15 2007, 04:28AM
Location:
Posts: 9
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 $20 for everything?
[edit]
I see he added this disclaimer:
ebay wrote ... On Aug-14-07 at 21:06:25 PDT, seller added the following information:
This secondary is not guarenteed [sic] to produce 20+ foot streamers. With 11,500 turns it should be able to though.
hey, with enough input power just about anything is possible....
But I still don't think you'd get anything out of it as presented (10 turn helical primary, no cap!, 10.5KV NST). And a 20' arc? Really? I've seen HUGE coils that can throw a 20' arc running at 15+ KVA, but they were still 5:1 and maybe 1200 turns of really heavy gauge wire... this is just junk on a pipe. Even the suggestion that a 20' streamer is possible with this coil borders on fraudulent, and is at the very least misinformed.
The guy might have better luck if he tried to sell it as an antenna.... or a sewer pipe.
Registered Member #941
Joined: Sun Aug 05 2007, 10:09AM
Location: in a swedish junk pile
Posts: 497
Mwahahaha, give it up, this stuff is NOT worth 1300$, 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.
Registered Member #546
Joined: Fri Feb 23 2007, 11:43PM
Location: Albuquerque, NM
Posts: 239
$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?
Registered Member #690
Joined: Tue May 08 2007, 03:47AM
Location: New Jersey, USA
Posts: 616
It's only worth as much as somebody is willing to pay for it; in this case I thinks that's, what, $5-20? lol but seriously you should scrap the base+topload and just cut up the secondary and either use the pieces or sell them.
Trust me, the people on this forum know EXACTLY what they are talking about.
Registered Member #955
Joined: Wed Aug 15 2007, 04:28AM
Location:
Posts: 9
HFsstc-freak wrote ...
Mwahahaha, give it up, this stuff is NOT worth 1300$, 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.
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12ft Tesla coil: Get yours NOW!!
