Many PCB sets in the tube era were built with the intention that the PCB be serviced while still mounted to the chassis...Most offered some way to get at the foil side to solder, but some makes Like GE and Philco encouraged crushing the body of a failed original part, leaving the original leads as points to wrap/J-hook the replacement parts leads onto. I have service Lit for GE that literally recommends and instructs how to replace a part in that manner.
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