The Laney GH50L head brought in non functioning wi…


The Laney GH50L head brought in non functioning with only one output tube having a working heater filament, now has a new pair of ceramic octal bases. The EL34s installed by the owner were a new matched pair. The switch on the rear for EL34 / 6L6 bias was in the correct position for the installed tubes but they were biased way too hot.
Having restored functionality to the power section we then find the amp has low output, excessive noise & the EQ section pretty ineffective.
V1-3 12ax7s all require replacement .

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