Harmony H400A - Professor Dan's Workbench

The Harmony H400A is a "widow maker" amp, i.e., it has no power transformer and is notoriously problematic for shocking users. This amp has been converted completely with a power transformer with multiple secondaries. The tube rectifier was replaced with diodes and the output stage replaced with a 12AQ5.

The three input jacks now have varying resistance for more tonal colors.

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