6 hours ago
Today I finished inspecting all the parts. The result is not very pleasing.
The first positive news:
1) The power transformer looks alive.
2) The speaker and field coil are alive.
3) The primary power capacitors C21, C22 are alive.
4) The power choke is OK.
5) All resistors are within normal limits.
6) All mica capacitors are within normal limits.
7) All lamps are most likely alive.
The second negative news:
1) All electrolytic capacitors C 8, 9,10,11,14,16,18 are dead (maybe not all, but I will still change them (repack).
2) Both potentiometers R11, R14 are broken (open or poor contact). I will try to restore them.
3) Most of the wires have cracked insulation and require replacement.
The third and very sad news:
Both audio transformers are broken.
I'll try to rewind it, but the phase inverter transformer can have over 10,000 turns in each coil, and the wire is less than 0.08 mm
It will be a terrible job to rewind. The output transformer is a little easier, but not much.
In the end, I'll probably start with restoring the case, and in parallel, step by step, I'll restore the circuit parts and chasis
Oh-oh-oh
The first positive news:
1) The power transformer looks alive.
2) The speaker and field coil are alive.
3) The primary power capacitors C21, C22 are alive.
4) The power choke is OK.
5) All resistors are within normal limits.
6) All mica capacitors are within normal limits.
7) All lamps are most likely alive.
The second negative news:
1) All electrolytic capacitors C 8, 9,10,11,14,16,18 are dead (maybe not all, but I will still change them (repack).
2) Both potentiometers R11, R14 are broken (open or poor contact). I will try to restore them.
3) Most of the wires have cracked insulation and require replacement.
The third and very sad news:
Both audio transformers are broken.
I'll try to rewind it, but the phase inverter transformer can have over 10,000 turns in each coil, and the wire is less than 0.08 mm
It will be a terrible job to rewind. The output transformer is a little easier, but not much.
In the end, I'll probably start with restoring the case, and in parallel, step by step, I'll restore the circuit parts and chasis
Oh-oh-oh

If you want to work, lie down and sleep, and everything will pass.