See the KB OP21/1 Transistor Rhapsody, in the Radio Museum
KB OP21/1 Service information
Notes; The KB Transistor Rhapsody is a similar chassis as the
The model OP21/1 can be identified by its 5/8th" diameter Ferrite rod. The
tuning condenser spindle is hexagonal.
If you want to use any image from this site please ask.