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4hv.org :: Forums :: General Chatting
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Post Your Cool Pic Here!

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Author Post
Dr. Spark
Sat Jan 30 2010, 04:36PM
Registered Member #290
Joined: Mon Mar 06 2006, 08:24PM
Location: Arizona, USA
Posts: 1674
Nice to have friends indeed!

Spark on, Dr. Spark


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brtaman
Sat Jan 30 2010, 08:00PM
Registered Member #2161
Joined: Fri Jun 05 2009, 03:36PM
Location:
Posts: 244
Dr. Spark wrote ...

15,000 watt Liquid cooled VTTC standing over 7.5 feet...... ETA W.W.T. 2011!

Spark on indeed!
Dr. Spark









Nice coil Dr. Spark!

Which tube is it going to run? I assume a Russian one? Looks great like all your coils, just one thing, won't that secondary be a bit small for such high input, or is the spark/length ratio the name of the game?


Best Regards,
brtaman
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Dr. Spark
Sat Jan 30 2010, 10:18PM
Registered Member #290
Joined: Mon Mar 06 2006, 08:24PM
Location: Arizona, USA
Posts: 1674
Thanks for kind words; this is L1 as a magnifier. L2 will be normal size. L1 is using 16AWG for heavy current and primary lose coupling. (this will allow sparks away from coil and be able to use a large tank cap). It is using a GU10B, have started a little website @ Have two GU10Bs, both new, one for backup thanks to Dr. H!


Rgs,
Dr. Spark
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vasil
Mon Feb 01 2010, 04:08PM
Registered Member #229
Joined: Tue Feb 21 2006, 07:33PM
Location: Romania
Posts: 506
Magnifier, hmmm? Interesting idea... (I am planning to use 15 kV input on a GMI90 VTTC)...
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Dr. Spark
Mon Feb 01 2010, 05:00PM
Registered Member #290
Joined: Mon Mar 06 2006, 08:24PM
Location: Arizona, USA
Posts: 1674
GMI90 are nice little tubes rated at 33kv on plates. Tube will be loafing at 15kv, should be a fun project indeed. Are you going to modulate the screen or use a resistor follower off the plate?

Can you post a cool picture of the GM190?

Rgs,
Ch
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vasil
Mon Feb 01 2010, 05:27PM
Registered Member #229
Joined: Tue Feb 21 2006, 07:33PM
Location: Romania
Posts: 506
Screen modulation, 2 NSTs (10 kV@100 mA) in parallel, full rectifycation, bare copper primary, 10 nF primary cap. Have to start a thread for it, but dont have even 30% of parts.



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brtaman
Mon Feb 01 2010, 08:13PM
Registered Member #2161
Joined: Fri Jun 05 2009, 03:36PM
Location:
Posts: 244
Wow nice tubes everyone. Kinda makes me want to get into VTTC country. :)

Dr. Spark: Makes sense, I was thinking that the secondary was a bit smal. Love the magnifier idea looking forward to your results.Come to think of it don't remember seeing a VTTC Magnifier before? Will you be going for CW flame style spraks or the swords?

The question now is, once finished where do you go from here...;-) Maybe a GU-49A-1 ,notice the similarity to my avatar...8-)

Vasil: That is a beautiful tube, one of my favourites from the Russian tubes. But going strictly by looks the GMI2b is the one I would most love to own.

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Dr. Spark
Tue Feb 02 2010, 01:09AM
Registered Member #290
Joined: Mon Mar 06 2006, 08:24PM
Location: Arizona, USA
Posts: 1674
brtaman wrote ...

Wow nice tubes everyone. Kinda makes me want to get into VTTC country. :)

Dr. Spark: Makes sense, I was thinking that the secondary was a bit smal. Love the magnifier idea looking forward to your results.Come to think of it don't remember seeing a VTTC Magnifier before? Will you be going for CW flame style spraks or the swords?

The question now is, once finished where do you go from here...;-) Maybe a GU-49A-1 ,notice the similarity to my avatar...8-)

Vasil: That is a beautiful tube, one of my favourites from the Russian tubes. But going strictly by looks the GMI2b is the one I would most love to own.





Man that is one cooooooooooool tube. Starting to really enjoy working with Russian tubes indeed.
Pics of a few tube projects coming up.

Spark on,
Dr. Spark

P.S. Pulse mode on the GU10.




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Arcstarter
Tue Feb 02 2010, 05:21AM
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2252
Please Chris, stop it with the SFW porn! Hehehe, eye candy for sure! Most beautiful things are tubes! I prefer a large transmitting tube over a full bridge worth of CM600 24 modules any day!
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Steve Conner
Tue Feb 02 2010, 11:30AM
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Yikes! The plate curves on that thing go up to 120 *amps* O___o
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Dr. Dark Current
Thu Feb 04 2010, 03:16PM
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Here are my russian tubes I received today. They're nothing compared to your monsters but anyway I think they look cool


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mb
Thu Feb 04 2010, 07:23PM
Registered Member #2485
Joined: Fri Nov 27 2009, 02:31PM
Location: Germany
Posts: 11
My new litte class e sstc


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brtaman
Tue Feb 09 2010, 10:01PM
Registered Member #2161
Joined: Fri Jun 05 2009, 03:36PM
Location:
Posts: 244


This is how you show a free-wheeling diode (MUR1560) its place.
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MinorityCarrier
Tue Feb 09 2010, 11:47PM
Registered Member #2123
Joined: Sat May 16 2009, 03:10AM
Location: Bend, Oregon
Posts: 312
Another field termination bites the dust.
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Steve Conner
Wed Feb 10 2010, 09:57AM
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Dr. Kilovolt wrote ...

Here are my russian tubes I received today. They're nothing compared to your monsters but anyway I think they look cool





Nice coffee pots Dr. kV!
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Fabio
Sat Feb 13 2010, 12:36AM
Registered Member #122
Joined: Fri Feb 10 2006, 12:55PM
Location: Milano Italy
Posts: 148
Hi All!

My new toy!







Ciao!
Fabio.
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rp181
Sat Feb 13 2010, 02:30AM
Registered Member #1062
Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529
Nice machine! the color sucks though :)
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Fabio
Mon Feb 15 2010, 12:20AM
Registered Member #122
Joined: Fri Feb 10 2006, 12:55PM
Location: Milano Italy
Posts: 148
Nice machine! the color sucks though :)



Yes, but this is the most common color for mechanical machines in italy, almost the 40% of lathes are green here!
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Nicko
Mon Feb 15 2010, 05:19AM
Registered Member #1334
Joined: Tue Feb 19 2008, 04:37PM
Location: Nr. London, UK
Posts: 615
Fabio wrote ...



How stable is it on those blocks of wood? We always used to bolt floor-standing lathes to the floor and or two-pot epoxy to the floor as well.

If you get a decent mass spinning nicely that then jams for whatever reason (e.g. poor tool feed) the whole lot can tip over...
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ScotchTapeLord
Tue Feb 16 2010, 01:25PM
Registered Member #1875
Joined: Sun Dec 21 2008, 06:36PM
Location:
Posts: 632
Today I bought a server unit for 10 dollars from someone on another floor of my dorm. He just had it in his closet! He claimed he didn't need it since he had another one. I don't know anything about servers, and I didn't have the space to store it, so I did what I do best... I gutted it for what it was worth... in my opinion.

Many nice and fast IGBTs all over one board. MOSFETs for high voltage and moderate current, and some super low resistance high current FETs for low voltage. Also Schottkys in large-ish package styles. Also, my heatsink problems will be solved for the next week or so =P and I'm not sure what to do with all these fans... In fact, I'm not even sure what to do with all the wires coming out of the fans! Well, the yellow and blue ones, anyway. Big ferrite cores and some filter capacitors in there, too.

I kept one of the power supplies intact (there were two) and have it currently jury rigged to three very powerful fans (each 12V@ 2.4A!). In case you were wondering, I went through the trouble to confirm that a fan such as this will, in fact, easily cut into one's finger. I guess I'll be playing with my 90 watt fan setup until I get to work on my brick driver! Not sure what else to do with 12V at a maximum of 55 amps! (I'm open to ideas...)





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Linas
Tue Feb 16 2010, 06:55PM
Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 698
complicated way of making tea

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Dalus
Tue Feb 16 2010, 08:48PM
Registered Member #639
Joined: Wed Apr 11 2007, 09:09PM
Location: The Netherlands, Herkenbosch
Posts: 512
Guess it does work
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Renesis
Tue Feb 16 2010, 09:15PM
Registered Member #2028
Joined: Mon Mar 16 2009, 08:13PM
Location: Norway
Posts: 319
Linas wrote ...

complicated way of making tea




7,45A x 12V x 0,95 = 84,9W

0,2L x 4,18 x 90°C x 1000 = 1254Wmin
60

1254Wmin = 14,8min = 14 minutes and 48 seconds
84,9W


Not horribly quick tho
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Linas
Tue Feb 16 2010, 09:45PM
Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 698
it's working when current is 20A and voltage is 24V, but 2,2Ah akku can't take long and BMS shut down akku.
but water was boiling :)
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Avalanche
Sun Feb 21 2010, 11:20AM
Registered Member #103
Joined: Thu Feb 09 2006, 08:16PM
Location: Derby, UK
Posts: 828
war of the currents









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klugesmith
Mon Feb 22 2010, 06:43AM
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1418
Avalanche wrote ...
war of the currents

Beautiful pictures. Is the dynamo in a museum?

Less well known than the "war of the currents" is the more general "war of the systems". By 1895, polyphase AC was well ahead of single phase AC in orders for new generating plants and transmission lines.
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c4r0
Mon Feb 22 2010, 08:31PM
Registered Member #151
Joined: Sun Feb 12 2006, 02:53PM
Location: Poland
Posts: 153
E.T. phone home


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Avalanche
Mon Feb 22 2010, 10:11PM
Registered Member #103
Joined: Thu Feb 09 2006, 08:16PM
Location: Derby, UK
Posts: 828
Klugesmith wrote ...

Avalanche wrote ...
war of the currents

Beautiful pictures. Is the dynamo in a museum?

Less well known than the "war of the currents" is the more general "war of the systems". By 1895, polyphase AC was well ahead of single phase AC in orders for new generating plants and transmission lines.



The dynamo is actually here The hall has a small industrial museum attached to it, and that dynamo is coupled to a steam engine IIRC. There was also some switchgear nearby, I'll have to have another look through my pics.

I never realised there was any non-polyphase AC generation, other than those small portable generators
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radiotech
Thu Feb 25 2010, 07:34PM
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1440
This is a General Electric Cat#250229 oil test receptacle,

Transformer oil was placed in the cup to find the AC breakdown
voltage. One of the prongs slides in to adjust the gap spacing.

It was in our generation department and was used on the 66kV line.

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Dr. Dark Current
Fri Feb 26 2010, 02:33PM
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384


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