JCM 800 2205 dated 1987.
Since about 30 years old and last known service dated from 1998 with new output tubes, it now got all them electrolytic caps changed and a new pair of EL34 power tubes.
New F & T cap vs old one.
A pair of caps hidden under the circuit board.
Guts after service, only mod is 1 ohm bias resistors added.
/Krister