25-01-2022, 10:11 AM
Thanks for a comprehensive reply Mark
This one is from the 1980's I'm told.
The early ones apparently had no power transistor heatsink other than the metal case. This now has a large slab of solid aluminium which the power transistors are bolted to as are the bias diodes. Neatly done.
I have run it for hours (no hum at any volume), never played so much music for a long time, and the power electrolytics run cold and have no swelling so inclined to leave them. I find these fairly 'modern' ones last if the device is regularly used. I repaired a 60's radio that was used on FM every day. As it was wired it was easy to break the common earth connection and measure the currents with a true RMS voltmeter... virtually DC leakage free.
All input stages seem fine and no rustles and crackles so again inclined to leave the few small electros alone. If it were easy to remove the board I would change them but it isnt. If it gets problems in the next few years it can come back. In 40 years someone else can fix it.
Pots and switches seem perfect and the only fault was a broken track to the centre pin of the L Aux Phono connector so one channel dead. Fixed with a piece of fine wire and solder.
He actually uses the Aux sockets for the turntable via a Pre-Amp that also give a USB output to his laptop.
Rega Fono Mini A2D Phono Pre Amplifier Black (New Version) (hifix.co.uk)
thanks again Gary
This one is from the 1980's I'm told.
The early ones apparently had no power transistor heatsink other than the metal case. This now has a large slab of solid aluminium which the power transistors are bolted to as are the bias diodes. Neatly done.
I have run it for hours (no hum at any volume), never played so much music for a long time, and the power electrolytics run cold and have no swelling so inclined to leave them. I find these fairly 'modern' ones last if the device is regularly used. I repaired a 60's radio that was used on FM every day. As it was wired it was easy to break the common earth connection and measure the currents with a true RMS voltmeter... virtually DC leakage free.
All input stages seem fine and no rustles and crackles so again inclined to leave the few small electros alone. If it were easy to remove the board I would change them but it isnt. If it gets problems in the next few years it can come back. In 40 years someone else can fix it.
Pots and switches seem perfect and the only fault was a broken track to the centre pin of the L Aux Phono connector so one channel dead. Fixed with a piece of fine wire and solder.
He actually uses the Aux sockets for the turntable via a Pre-Amp that also give a USB output to his laptop.
Rega Fono Mini A2D Phono Pre Amplifier Black (New Version) (hifix.co.uk)
thanks again Gary
