SB-200, Harbach power supply board, Harbach soft start module, new Cetron
572b tubes initially burned in for 24 hours with high voltage and cut-off
bias and with about 10 hours of use on them.
Turned on amp and big bang sounding like rifle shot. No smoke, no smell.
Turned off immediately and checked all values and voltages. All OK. No
visual sign of arcing or burning.
Turned on again and been working fine all week.
Cause? Anything I should worry about? Anything I should fix?
Steve W4IMF
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