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RE: Thomas stereo organ amplifier 6973 to 6cz5 conversion

The RCA data sheet states 500K maximum for fixed bias, not 100K. In any event, when fixed bias is used, it's assumed the grid resistor will be connected to a low resistance node of the negative bias supply, not ground.

About dropping the anode supply, you might want to consider a small string of Zener diodes. Adding series resistance will degrade supply regulation.





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