TECHNICS SU-50A solid state integrated amplifier junk

  

An integrated amplifier released by Technics in 1969. Technics, which achieved OTL (output transformer-less) with the 5-parallel push-pull tube power amplifier SU-20A, has achieved Japan's first OCL (output capacitor-less) with this SU-50A, After that, OCL became popular as an amplifier circuit.

I was able to get sound, but there are many problems. There are times when the speaker selector does not switch. The input selector switch is hard. There is a poor contact on the knob.

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