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Thank you very much for your response, I am led to believe the issue is with a transistor in the power supply circuit causing the relay to not kick in. Does that sound accurate? I have got a service manual for the 7500, which I have used to identify original transistor models. I dont quite...

Hi there, refurbishing a Pioneer SA-7500 with intermittent relay. For substitute transistors, can I used higher rated Voltage. (Such as is the case for capacitors - higher V can be used as substitutes as long as uF is met.)