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Tech-Talk Amps / Re: BFlex - CT H
« Letzter Beitrag von paulbiagi am 11.08.2026 14:51 »After reflecting some more, the bias voltage is negative.
Floating the heaters with negative DC could exceed the heater-to-cathode voltage rating of a preamp tube.
It seems floating with positive DC would be more desirable.
But if there's no hum, a float may not be necessary.
Am I missing something? Why would the heaters be floated with negative bias voltage?
Floating the heaters with negative DC could exceed the heater-to-cathode voltage rating of a preamp tube.
It seems floating with positive DC would be more desirable.
But if there's no hum, a float may not be necessary.
Am I missing something? Why would the heaters be floated with negative bias voltage?

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