Re: Bush DAC90A hum - AGAIN!
I think this has been mentioned but the UL41 is def prone to hum due to internal leakage. I see you have changed it but is the replacement new ? They can be zapped to fix this, do a search for “zapping a ul41” or similar, in the forum. A DAC90A of mine was bad until I replaced the UL41 with a new one. I guess the valve base could give the same problem so if the valve is def OK, a new base could be the next move.
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