My first job in the industry in 1974 was a small company in Lexington Ma. Next door to us was a Tektronix office that also did repair and calibration. Every day they would line up the chassis’ of all the scopes in for repair on the loading dock and go at them with a garden hose. I’m sure it was the final rinse in the cleaning process. I rebuilt a Heathkit SB-101 transceiver last summer. Stripped the chassis of tubes and the VFO and scrubbed it in the kitchen sink with warm water, Dawn detergent and a paint brush followed by 2 hours at 150 f in the oven. No harm to any of the boards, components, coils or transformers. Brought the cable harness colors back to life. You have to re-lube all the pots and switches.
I recently worked on my 465 that was almost as old. It was much cleaner inside since it is mainly solid state, fewer air vents and less convection pulling air pollution into it.
Dave , W1BVV
