Got this for $100 SGD with bad conditions and repair before by some unprofessional people. Power board use mix of power and driving transistors! Missing big filter caps cover and metal support x 3 pcs! PCB crack under the big cap due to movement. This is really a old set and heavy beast.
Repair done:
Remove all grease on pcb.
Clean and polish all the switches, then put contact oil to protect it.
Change all power and driver transistors to match pairs.
Clean and polish relay contact.
Repair crack pcb with wires, solder and solder mask.
Repair the wood board with wood wax.
Change the bias VR to 10 turn type for accurate adjustment.
Make metal support frame and cut big capacitor holder to secure it to prevent movement.
Finally all cleaning and painting of the cover to prevent rust.
Total repair many manhours!
Enjoy some pictures.
