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Registered Member #2028
Joined: Mon Mar 16 2009, 08:13PM
Location: Norway
Posts: 319
William Monk wrote ...
A lot.
Just one simple tip. On the right of your posts you have three small buttons, one of which is called "Edit". It is preferrable that you use the edit function instead of double posting. In fact the forum rules states that you should do so, unless your previous post is older than two days.
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
your cap looks like a filter cap. you can try charging them + and - 9kv DC with your neon utilizing a fullwave center tap. It is probibly more sutible as a VTTC power supply cap or hv dc power supply. what you need is a pulse type capacitor.
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
some filter caps act like a short to 60hz NST's have you tried charging it with HV DC. Try about 10 1n4007 in series with one pole and ground from your neon sign transformers
Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
It reads "Paper Capacitor" on the ID tag if you look carefully.
I have used Sprague Mica doorknob caps for SGTC with my 12/30, which worked fine. When I used my 12/60 it killed the transformer because Mica's short when they are pushed too hard in pulse duty. They are designed for CW, so don't use them for SGTC unless you can risk the cap and transformer.
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
Hi William I found thease I have seen them used for SGTC's and DRSSTC you may need a bunch in series paralell configuration. if you live in the UK or EU Franell may also have them.
the mica cap is not a pulse rated cap and would be best in a vacuum tube TC but with a helthy derating and a safty gap and proper filter for neon sign transformer. any how this is my expierience. Any SGTC you build should have the filter and safty gap.
if you think that you are up to the the task you have two of the main ingreadiance for a VTTC.
Registered Member #2470
Joined: Tue Nov 17 2009, 05:47AM
Location: Simi Valley, CA
Posts: 43
Teravolt, That is the exact path that i am going down. I am going to go buy that mica cap tomorrow, and i'm going to look for some tubes. You never know, i might just get lucky. Electronics surplus stores can be a treasure hunt.
Also, i found a good deal on some CDE 942C's and ordered 40. Then one of my NST's blew up. So I now have 40 new capacitors all nice in an array that i'll probably never use (as configured). In the mean time, i am going to make a VTTC, but once i finally find a pole pig, i will finalize my SGTC. I think that VTTC's are more elegant, but the long sparks of a SGTC are made to impress.
You can see my thread about my capacitor bank that i worked on ALL DAY making. Oh well, I guess it happened for a reason.
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Look what i picked up today!
