Probably some “idiot” plugged a line source into the phono input, and blew it. Or not… but it remains the likely problem (could be static discharge, ground-fault or ground-loop problems while plugging in creating a ¹¹⁰/₂₂₀ volt tip-to-ring voltage. Lots of reasons)
Anyway, if so, then replacing the first transistor in the chain is also most likely the cure. That, and if it has a series DC blocking capacitor, it too could/should be blown. I'd replace the pair if I had precisely no troubleshooting/metrology equipment. Heck, if the parts were in my “crazy box of coveted doohickeys”, I might even just replace them both before digging heavily into the metrology.
Just saying…
GoatGuy
Anyway, if so, then replacing the first transistor in the chain is also most likely the cure. That, and if it has a series DC blocking capacitor, it too could/should be blown. I'd replace the pair if I had precisely no troubleshooting/metrology equipment. Heck, if the parts were in my “crazy box of coveted doohickeys”, I might even just replace them both before digging heavily into the metrology.
Just saying…
GoatGuy
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