| I … use a slightly different approach. I use the center-tap as a fixed DC balance (cathode bias resistor solo from c.t. to ground) and use the balance pot with the bypass cap only to ground for adjustable AC balance. Regardless if you try this approach or not, I always recommend padding the hum balance pot to reduce the effective DC resistance that the pot adds into the circuit. As an example, using a 100-ohm balance pot, your effective (series) resistance with the bypass cap is 25 ohms. Using a pair of 12 ohm resistors (wiper to each end) drops this to ~5 ohms. It helps... and there's no such thing as too quiet. |
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