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6L6GC PP amplifier with SS phase inverter
6L6GC PP amplifier with SS phase inverter
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Old 11th October 2018, 07:02 AM   #31
artosalo is offline artosalo  Finland
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Quote:
Hopefully 100K... since I have a bunch of 100K linear pots...
6L6GC with 300 V at screen requires some -25 V to -30 V grid bias. Have you calculated what the raw minus supply should be with the present schematic and 100 k bias balance pot. I quickly calculated that at least some -200 V is reguired, because of so many voltage dividers.
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Old 11th October 2018, 04:19 PM   #32
H713 is offline H713  United States
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Quote:
Originally Posted by artosalo View Post
6L6GC with 300 V at screen requires some -25 V to -30 V grid bias. Have you calculated what the raw minus supply should be with the present schematic and 100 k bias balance pot. I quickly calculated that at least some -200 V is reguired, because of so many voltage dividers.
Now that I'm not running my op-amps off of the bias supply, I will probably just use a spare 120 or 130 volt winding on the PT. So in all likelihood I won't be too far off of the -200 number you mentioned.
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