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Old 4th August 2007, 12:52 PM   #11
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Quote:
Originally posted by nhuwar

For b+ on the output tubes i am going to use rg58 with mhv connectors.

Nick
If you use RG58 or RG59 for HV the PTFE insulated variety is recommended.

The "bundle" on my Hallicrafters HT-45A "Loudenboomer" uses vinyl tubing.
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Old 4th August 2007, 01:35 PM   #12
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Quote:
The B+ wire is 1kV rated and the rest is 600V. All are stuck in some heat-shrink.
Sounds like what I've done with my RA-100a project

With +/- 600V supplies(!),I'm not playin around.
All wire is rated 1kV or 600V.Anything with a high-potential on it gets extra insulation-from some cat-5 cable and/or heatshrink.
Also,all the traces/solder points on the boards,and the octal output tube sockets get a coating of clear nail polish ( ) just to help insulate them,and prevent any arc-over.

Maybe it seems overboard,but 1200V can REALLY ruin your day.
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Old 5th August 2007, 03:41 PM   #13
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Quote:
Originally posted by dsavitsk
Anyhow, I know people (SY in particular) don't like the use of XLR connectors as power connectors (SY likes to say it is when, not if you will plug the wrong thing in the wrong place) but I can't get my 3 prong audio connectors to connect to the 5 prong XLR connectors I bought for power a while back, so I may just use them here. The Amphenols may have to wait until I build something larger and more military ready ...
Eeek, 5 pin XLR means DMX control line to me... I haven't seen them used on new gear in a long time but you used to see pieces of equipment with special 3 pin XLR connectors specially designed to be safe for 240V, even on the male plugs. I saw them used on 16mm projection equipment, among other things. I don't know if they are still available, but they could be useful.
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Old 5th August 2007, 05:01 PM   #14
nhuwar is offline nhuwar  United States
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My current amp that uses 1kv b+ as I said will have rg58 in the umbilical.

But inside the amp and on the bread board I'm currently using wire rated for 40kvdc 20 gauge just for safety while bread boarding.

When then supply chassis is built all hv connections will not have nail polish on them but will have corona dope covering them.


The thing is I am well experienced in working with very high voltages so it definitely comes in handy here.



Nick
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Old 5th August 2007, 05:14 PM   #15
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Quote:
Originally posted by thevoice
Eeek, 5 pin XLR means DMX control line to me...
Datasheet says they are good to 350V and a couple of amps.
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Old 5th August 2007, 05:21 PM   #16
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Quote:
Originally posted by dsavitsk


Datasheet says they are good to 350V and a couple of amps.
I'm sure they are, I just had visions of lighting desks catching fire.


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Old 6th August 2007, 01:25 AM   #17
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Quote:
When then supply chassis is built all hv connections will not have nail polish on them but will have corona dope covering them.
I tried looking for that stuff,but couldn't manage to find any!
Got any clues as to where I might find some?
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Old 6th August 2007, 02:07 AM   #18
nhuwar is offline nhuwar  United States
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http://www.gcelectronics.com/order/product_search.asp
Red insulating varnish is the ulitimate in high voltage insulation though and it's made by the same company, GC Electronics.

Hope that helps.


Nick
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