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High voltage electrolytics

Does anyone know of a good source for HV electrolytics (600 or above)? Or are "NOS" or eBay the only options any more? Are any companies still making them in small runs for those of us who (in growing numbers) are still using and preferring tube audio? Most values can be found in up to 450V or 500V ranges, but most tube setups use voltages around 600V and I've blown 500V units attempting to use them as suitable replacements. Been able to find various values at many different suppliers, but does anyone know of a good 'one stop shop' for these beasts?

Reply to
EricM
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Don't bother with NOS. They deteriorate sitting around unused. If you need a 600v+ V rating just use 2 in series with balancing resistors around 220k. Say you need a 40u @ 600wvdc, use 2 80s @ 350 or better in series. The ESR will add in series but for a plate/filament transformer based pwr supply it won't make a big difference. Look at this schemo for an example:

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Reply to
boardjunkie

Don't bother with NOS. They deteriorate sitting around unused. If you need a 600v+ V rating just use 2 in series with balancing resistors around 220k. Say you need a 40u @ 600wvdc, use 2 80s @ 350 or better in series. The ESR will add in series but for a plate/filament transformer based pwr supply it won't make a big difference. Look at this schemo for an example:

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That's standard practice in a HV tube B+ supply. Most of the overvoltage situations in tube amps occur at startup before the tubes start to draw current. You can clamp the B+ using zeners to protect your caps at startup if it's a problem, and/or wire up a switch to apply power to the heaters before the B+ gets turned on.

Reply to
Dave

Greetings Eric..

As I look, it appears that Mouser has them all the way up to

800WVDC.

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In any event, even if they don't have exactly what you're looking for, give them a call and they'll know who does OR the manufacturer to contact.

Cheers, Mr. Mentor

Reply to
dBc

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