Sansui 3000A Protect trips after warm up-FIX
Sansui 3000A. in addition to the usual crusty controls/switches and limp dial cord, this unit would trigger the protect circuit after 20min or so of run time.
Solution was to replace Tr901 2SC458, and Ca02 10uf /35vdc.
The xistor had a leaky junction that had just enough voltage to trip the gate of SCR
Perhaps this info will save someone a bit of troubleshooting time.