Tube DIY Asylum

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RE: Fixed bias problem, and no, it is not the tubes.

Posted by sony6060 on January 15, 2017 at 07:12:40:

My bias supplies. Note the poly type capacitors that last forever. I use two bias supplies. -19 volts for power 6V6GT tubes & -140 volts for the phase inverters. With bias the phase inverters do not need a large capacitor to ground. Hard to see, but the rectifier bridge is at the bottom. I used 4 diodes for each supply. The silver caps at bottom are .01uF @ 1000 volt capacitors across the bridges to shunt any possible noise. The bias supplies have less than .001 volts ripple.