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If AC for powering the filaments may generate hum in the signal, is there an easy way to give 6.4 DC to theses tubes instead of AC ?

I was thinking of using a diode bridge followed by a capacitor an a regulator based on a 2n3055 with a zener. Maybe there is existing 6.4 volts regulator already on the market ?

Maybe the current for all the tubes is too big to think about rectifying and regulate it after all ?


Thank's for your answers.

P.S. I don't know if it is the right place to post that kind of questions. If not, please tell me.

Generally, it's not a great idea to rectify the heater supply, as often it introduces high frequency buzz noise into the amp. If you do a lot of filtering and regulation it can work, but just for the preamp valves. It's a lot of unnecessary complexity. Even some very high gain amps like the Soldano SLO 100 use AC filaments. Usually, keeping the heater wires away from the other electronic components, plus "DC elevation" of AC heaters works better. In this you apply a +ve DC bias to the heater supply. The simplest way is to connect the heater supply's centre-tap to the cathodes of the power tubes (in a cathode-biased amp).

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Great answer, as always.

Many thanks Zaphod !