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In my experience,

HA-107 will take 1-2 mA imbalance in the primary. My driver circuit is a pair of 45 with a common cathode resistor. I matched tubes as best as I could, and then compensated for the remaining difference with additional small resistor in one of the cathodes. Due to drift, there could be 0.5 - 1 mA unbalanced current, but I did not notice any deterioration.


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  • In my experience, - sser2 14:00:01 03/12/07 (0)


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