Pioneer SM83 Tube Stereo Amplifier 7189a El84 

New Tung-Sol 7189A tubes, all resistors (TE Connectivity Swiss low-noise) and capacitors replaced (Panasonic Nichicon 10,000 hours of operation at 105 degrees). New power switch, new oryginal volume, balance potentiometer, new tone control potentiometers.

The old selenium rectifier bridge has been replaced - selenium reacts with oxygen and such bridges should be replaced. New diodes, new banana plugs instead of screws, new power cord.

New tube sockets with more reliable contact, Potentiometers for this model, the power switch is unavailable on the market! Think about it when you buy such an amplifier where some idiot used chemical spray to clean them, causing the silver contacts to evaporate.

good luck :)