Using DC for the output tube heaters is a challenge, not recommended! You can use a DC heater for the voltage amp section. If you rectify the heater supply, you will need high capacitance and you also need to drop the voltage. The main point of failure for amplifiers that use DC heaters is that capacitor and sometimes rectifier bridge.
Ηi my friend anatech.
is this a good solution ? this photo its from a member. He use external heavy bridge rectifier on chassis, and step down converter 10A.
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