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mine is minimum volume hum.
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A few questions:
1. Does the hum actually get louder as you turn the volume control down?
2. Do you observe any change of hum as you change the volume control when the grid of the 25L6 is disconnected?
3. Are you absolutely sure that the cap across the 330 ohm resistor in the cathode circuit of the 25L6 is connected correctly? Properly grounded?
4. Do you have a few more 25L6s to try?
jr