got myself an xmas present, an A-156 Dual Quantizer and I noticed that the 7805
regulator sticks out beyond the panel.

see here: https://goo.gl/photos/DRdvVUyFmh4vc8Gs5

nothing I can't fix myself, but somebody else might have racked it as-is and
shorted something out on the module next to it...

Regards,

Vladimir