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How to run RH807 at 400V?
How to run RH807 at 400V?
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Old 23rd April 2011, 09:31 PM   #1
carbondated is offline carbondated  United Kingdom
diyAudio Member
Join Date: Jan 2011
Default How to run RH807 at 400V?

So I've decided to try out the RH807 as my second build, after the success of the RH84. It's almost the same circuit but with differently-rated components, and the choice of 807s, KT66, or 6V6 as output tube. Suggested voltage is 320-0-320 to produce a B+ of 350V. The author suggests it can be run with higher voltages, but with appropriate modifications... which he doesn't specify.

I'd like to run this with a 6L6 at around 400V, but (1) I have a Lundahl with 250, 48, and 250 windings. My first inclination is to use the 250+250 and drop this (high-wattage resistor voltage divider? but would that be detrimental to the sound?) somehow -- any suggestions? And (2) how much bigger would the choke have to be? Kitic adds just one more 10H/50mA to the RH84 power supply, but I suppose would be prudent to add another choke and capacitor (CLCLC) - say 20H/80mA and 200uF on each rail (or do I really have to split the two B+ rails?).

Here's the schematic:Click the image to open in full size.
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