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In Reply to: RE: This might be close. posted by joshie on January 16, 2022 at 10:12:32
Rather than "regulating" the bias supply, just change a resistor or two to get the voltage into range. Better to have the bias, plate and screen voltages change together with line voltage - if bias voltage is truly fixed, dissipation and operating point vary with supply voltage. They'll "track" if all are left unregulated (regulate screen and grid voltages and it will be even better, but that gets complicated...)
Follow Ups:
Ok I played with the divider in the bias supply and now I'm able to get -17 output tubes are drawing about 35 ma I don't know how accurate this old weston 911 is though.
Thanks for all the help guys especially Tom who has helped me with many amps from magavox to my heathkit aa-81 mono blocks.
I now suspect that the 10watt 560 ohm resistor I put in front of the input filter is really making some heat so should I find some 1k or 1.2k 10 watters and double up?
Ok nevermind about the paralleled resistors now that the output tubes are drawing proper current there's no need for the dropping resistor to be in there.
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