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In Reply to: RE: Rating (Voltage) question. posted by ianm0 on April 16, 2015 at 18:27:03
I wouldn't do it, as I am very fearful of insulation breakdown occurring. IMO, 500 V. is pressing your luck way too far.
Eli D.
Follow Ups:
may I have some suggestions as what kind of plug/sockets to use for 500VDC? Industrial stuff?
Check the Amphenol catalog. They make zillions of really nice plugs/sockets with various numbers of pins of various sizes. The catalog parts also carry voltage ratings.
I would use octal sockets and plugs. Either can be purchased with a shell for attaching to a cable end. These have been successfully used for many years in ham radio gear carrying up to 750V or so. Heathkit used the 11-pin variety, but those might cost more.
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Buy Chinese. Bury freedom.
Good thinking. But still need a bit more help.
Since I only need 4 pins, I could use tube socket for, say, 300B. But is there a male plug which will go into this female socket?
Or the same question for octal plug?
I don't recall seeing less than 8 pins on a round male plug w/shell, at least not anything made since the '60s. Plugs with a keyway (usually 8 or 11 pins) are more common and more convenient to use.
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Buy Chinese. Bury freedom.
Where can I get the Octal plugs and sockets? I have had some difficulty finding a supplier.
Here are the plugs, then you will need whatever flavor of
octal tube socket you like and you are good to go.Cal
Edits: 04/17/15
nada aqui
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Buy Chinese. Bury freedom.
Surplus Sales of Nebraska has the 11-pin variety:
https://www.surplussales.com/Tube-Sockets/TubeSkts-3.html
They also sell the Cinch-Jones type, but I don't know if they have a matching set with the correct gender for a complete system. It's important to construct the system so the male ends can never be exposed with high voltage. IOW, the power supply would have a socket (female) on the chassis, and the power supply end of the cable would be a plug (male). The other end of the cable would either be permanently installed in the amp/preamp, or it would have a cable-end jack (female) that mates with a chassis-mounted plug (male) at the amp.
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Buy Chinese. Bury freedom.
I am successfully using XLR (Cannon) connectors for the umbilical cable between my preamp (RPA, featured on my old site) and it's power supply.
Basically it's 4 wires, approximately 300V DC, ground, and 2 contacts for 12.6V elevated at 1/4 B+.
Never had issues with that cable or the connectors in more than 10 years.
When it comes to arc overs, just think of a capacitor or even better, PCB standards for minimum distance between tracks depending on the difference in potential (i.e. voltage).
For AC RMS, make sure you multiply the DC rating by 1.44 and for DC divide the AC RMS rating by 1.44 ...
******
http://rh-amps.blogspot.com/
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