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First you need to ask the seller of the board to help you with the power supply board because it is obvious that the schematic is wrong in the rectifiers part. Maybe the board is designed correctly (full wave rectifier).

Second, the total heater consumption of all vacuum tubes at 6.3V is more than 1.5A and if your transformer can only supply 1A on that secondary, it will be overloaded and overheat. You should also check that.

If you have a DMM, measure the voltages for heating and +B in the DC and AC positions on the output pins of the rectifier board, and send it here.


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