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I am currently working on an neat old M O T Dickerson amp with a 6" field coil speaker. There is no volume control. Someone has added a toggle on/off switch and done some recapping. I don't know yet what else has been done. The preamp is a 6SF5 which I have never worked with before. This tube was biased by a bias cell from input jack to grid, pin 3. There was almost no volume so I attempted to read the voltage on the cell. There was none and one lead was almost corroded off. I replaced the cell with a short length of wire and have greater volume wih a bit of distortion.
The cathode, pin 2, appears to be grounded, just with a bit of wire.
Do any of the pros out there think it would be okay to replace that cathode ground with a resistor, say 400 ohms, and a .047 bypass cap?
The other tubes are 6V6 and 5Y3.
I have been searching the web where , of course, one can believe all that one reads and have seen many many differing opinions, so I came here, where I trust the opinions.
Any assistance would be appreciated.
The cathode, pin 2, appears to be grounded, just with a bit of wire.
Do any of the pros out there think it would be okay to replace that cathode ground with a resistor, say 400 ohms, and a .047 bypass cap?
The other tubes are 6V6 and 5Y3.
I have been searching the web where , of course, one can believe all that one reads and have seen many many differing opinions, so I came here, where I trust the opinions.
Any assistance would be appreciated.
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