I agree with Arthur. The Cabinet was kind of a universal "catch-all" used by Bell Telephone in the late 60s and early 70s.
If you got shocked, then there was something SERIOUSLY wrong. That cabinet cover is fiberglass and is NOT conductive. Aside from the line voltage feeding the power supply which should have been a molded female cable assembly and the voltage adjustment taps should have had a plastic cover over them the only other voltage that could give one a little jolt would be the ring generator.
Rcaman
