I purchased this second-hand unit at an electronics fair. It showed serious issues caused by years of complete neglect: the output tube bias had probably never been adjusted, the polyurethane tube sockets were completely deformed, making it difficult to insert or remove the tubes, and several electrolytic capacitors had shorted out, blowing the fuse.

I started by replacing the damaged sockets and rewiring the entire filament supply, which had originally been made with wires that were far too thin. I then replaced the faulty electrolytic capacitors and checked the condition of all the remaining components.

Unfortunately, during the first test, another issue appeared: the power transformer was also faulty. When powering up slowly with the variac, the current draw already exceeded 1 amp at just 50 volts. At that point, there was no alternative — I had to completely disassemble it and have a new one rewound.

Here is the rewound transformer, keeping the original bobbin and core, which had non-standard dimensions (probably measured in inches).

Once the restoration was complete, the unit was back to full working order. After many hours of work, it was finally time to enjoy the music once again.