Hi, I cant find solution myself, so...
Bride of Zen build, almost all parts like original, except power supply transistor is bd239. Volume pot is 5Kohm, pot wiring is checked (output + in pot wiper). Tried different transformers, voltages were ~60V but also tried over and under voltages. Bias set 30ma. All parts stays pretty cool, under 40 degrees celcius.
Symptom is that at very low volume sound is little too much bass heavy. If volume is rised, then bass will become muffled and treble...
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Bride of Zen build, almost all parts like original, except power supply transistor is bd239. Volume pot is 5Kohm, pot wiring is checked (output + in pot wiper). Tried different transformers, voltages were ~60V but also tried over and under voltages. Bias set 30ma. All parts stays pretty cool, under 40 degrees celcius.
Symptom is that at very low volume sound is little too much bass heavy. If volume is rised, then bass will become muffled and treble...
Read more