21-05-2015, 09:11 AM
Try to find out where the hiss is starting from before going down the route of just replacing bits on spec.
If you have a radio with a gram socket or an amplifier that you can use, try picking the audio from across the volume control and feeding it into your amp input. Or do you have a signal tracer? There are loads of little circuits for tracers on the net, only a few components, very cheap.
If the hiss is still there then, its not in the audio stages. Most possibly then its the detector diode in the last IF can.
My sheet for TR82C is the one with OC4* RF transistors and all OC72 AF, I think yours is later, may have OC72 and OC81 audio stages.
Is the electrolytic cap that goes to the volume control slider in the right way round? Should be + to pot?
If you have a radio with a gram socket or an amplifier that you can use, try picking the audio from across the volume control and feeding it into your amp input. Or do you have a signal tracer? There are loads of little circuits for tracers on the net, only a few components, very cheap.
If the hiss is still there then, its not in the audio stages. Most possibly then its the detector diode in the last IF can.
My sheet for TR82C is the one with OC4* RF transistors and all OC72 AF, I think yours is later, may have OC72 and OC81 audio stages.
Is the electrolytic cap that goes to the volume control slider in the right way round? Should be + to pot?
Boater Sam.
