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Author Topic: 76 Red Knob Concert Lead Output Transistors  (Read 124 times)

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76 Red Knob Concert Lead Output Transistors
« on: May 23, 2018, 10:00:33 pm »

I’ve got a red concert lead on my bench.  I’ve come to the conclusion from testing that Q3  is bad (reading voltage from collector to emitter). This unit has 22-3155 7613 transistors (not available) instead of the still available 2n3055 listed on the scheme. Are these interchangeable? Considering the scheme should I replace all 5 Q’s with 2n3055 like the original scheme? Can I just replace one or need they be changed in pairs similar to tubes?