Recently my much older friend said "nobody knows how to properly adjust a Vibroplex[1] any more"

I've not willingly sent CW in about 40 years, but I think I'm going to ask him to show me how to adjust one, just to know.

I've learned more about repairing vacuum tube equipment than I'll ever need to know, I'm actually thinking I could do it. It's the 1000+ volts in amplifiers that scares the sh*t out of me, and why I'll not be doing that myself, thank you very much.

[1] https://www.vibroplex.com/contents/en-us/d12_SEMI-AUTOMATIC_...

It turned out to be interesting, details abound, but it's not magic.