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Hi again,
The tank installed in a bag and foam strips really helped a lot. No oscillation/feedback now from the tank and it sounds good now. Still some hum but I guess that's just the way it is. It helped a lot to reduce noise to remove the grounding of the pots in the metal mounting plate and use cable back to the ground trace of the board and it's all reversible.
I want to change the 68 Ohm anode resistors of the power tubes that are only 1/2 watt carbon film to 2-3watts metal film as well, after that I'm done. It's a great sounding amp...
Thanks all for your tips.
The tank installed in a bag and foam strips really helped a lot. No oscillation/feedback now from the tank and it sounds good now. Still some hum but I guess that's just the way it is. It helped a lot to reduce noise to remove the grounding of the pots in the metal mounting plate and use cable back to the ground trace of the board and it's all reversible.
I want to change the 68 Ohm anode resistors of the power tubes that are only 1/2 watt carbon film to 2-3watts metal film as well, after that I'm done. It's a great sounding amp...
Thanks all for your tips.
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