Nero s auto draw voltage7/3/2023 ![]() Adjusting this stage is 'overall' so it also affects the E元4 stage, which is drives. There is a phase reversal stage in here, with two ECC82, and it has an adjustment potentiometer. This will definitely damage the tube heaters, but also DC voltages and currents inside become wrong, and the mains transformer may produce mechanical hum.įrom this schematic it gets clearer what you need to look at. ![]() ![]() Plug a 220V amplifier in 240V, means 10%. Heater voltage tolerance of tubes is maximum 5%, but taking 5% as a default is a very bad idea also. It should be well known, but I just mention it here anyway, you can not connect 220V amplifiers to 230V or even 240V without a mains adpating transformer, unless the amplifier is specified to do so. Imagine, he is not the only one with that problem, but perhaps the only one that draws the schematic before he begins. I was given a hand made schematic by a person, who helped himself.
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