c.coyle
Fighting the Dunning-Kruger effect.
Here is 1970 Sansui AU-777A. It's in beautiful shape outside, but has mild-to-moderate smoking residue inside. Looks like the original owner was a smoker who took care of his equipment. Pots and switches are scratchy, but all the ins, outs, and controls work, and it sounds OK. A quick visual inspection reveals no obviously damaged components or bad solder joints. No glue on the boards.
This will be a winter project. First step is a thorough interior cleaning to get rid of the smoke residue, followed by cleaning the pots, switches, and connectors.
It has some cool bells and whistles: separate stepped tone controls for each channel (with defeat), balance check switch, stereo reverse, three mono options, selectable pickup load for phono 2, and mic input.
A little quirk: The loudness lever switch doesn’t detent. No clicks or stops, it just moves smoothly from one end to the other. Loudness comes on OK, but it doesn’t sound like variable loudness. The schematic just shows an off-on switch. I don’t know if the switch is defective or if it’s built that way.
And the pièce de résistance: An original fold-out schematic in an envelope on the bottom! The schematics on Hi-Fi Engine the AK database are pretty fuzzy, so I'll try to do a high-res scan and upload it.
These triple-digit black beauties are gorgeous.
This will be a winter project. First step is a thorough interior cleaning to get rid of the smoke residue, followed by cleaning the pots, switches, and connectors.
It has some cool bells and whistles: separate stepped tone controls for each channel (with defeat), balance check switch, stereo reverse, three mono options, selectable pickup load for phono 2, and mic input.
A little quirk: The loudness lever switch doesn’t detent. No clicks or stops, it just moves smoothly from one end to the other. Loudness comes on OK, but it doesn’t sound like variable loudness. The schematic just shows an off-on switch. I don’t know if the switch is defective or if it’s built that way.
And the pièce de résistance: An original fold-out schematic in an envelope on the bottom! The schematics on Hi-Fi Engine the AK database are pretty fuzzy, so I'll try to do a high-res scan and upload it.
These triple-digit black beauties are gorgeous.