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In Reply to: RE: Screen voltage regulator. posted by DAK on May 01, 2017 at 17:02:30
DAK, are you referring to a circuit that can be built into an amplifier, or do you mean a variable bench supply (250-450V)? There are lots of circuits around for the latter. Building a supply like that into an amplifier is awkward due to size constraints. Semiconductors aren't generally very reliable at those voltages, although I suppose it can be done. I've never tried, because I usually flesh out new designs on the bench, then use a fixed voltage in the gear.
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Buy Chinese. Bury freedom.
Follow Ups:
I'm going to disagree. I used MOSFET voltage regulators for B+ as I find it makes for better sound. I basically modded a Nelson Pass design (Nelson only does SS). it worked fine, I retrofitted the amps I had and put it in all subsequent builds. I go overkill when I engineer, so I use MOSFETS rated for more voltage than I think the device will see, and reliability has not been an issue.
Hi TK, i am considering an on amp design like the "maida regulator" or Kevin at K&K, sells one too. I am thinking about giving the K&K one a go on my amp to see if it is worthwhile to do it.
Are you interested in the solid state regulator because it's variable? If I remember correctly, the Maida site states 10%. That's a much smaller window than the 250V - 450V numbers you mentioned earlier. Actually, I'm not sure what the SS version buys you that a little experimentation with gas regulators wouldn't accomplish. Besides, they glow! :)
0D3 and 0A2 (150V): pink/lilac
0C3 and 0B2 (105V): pink
0B3 (90V): purple/indigo
0A3 and 0C2 (75V): orange
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Buy Chinese. Bury freedom.
Initially i was going to go with them and i bought various ones like you outlined, but besides the additional space required i read that tvr produce a fair amount of "noise" or distortion. I am not sure if this is true or maybe circuit dependant, but adding up the pros and cons i now feel that it maybe easier to go with the SS voltage reg. Just a few wires going in and out.
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