How many people wish they could maintain and/or service/modify their own tube equipment?

Right. Always pay professionals. Never do anything yourself. Above all never bother to learn how anything works. Brilliant strategy.

Og cold. Og try find fire builder. Og find no one. Og not try. Spark might hurt. Og go back cave, shiver dark alone.

I, like you, have no idea of what would need to be fixed, so I send all my tube stuff (and SS stuff) to Ralph Karsten at Atma-Sphere.
He knows his stuff and his recent work of finding the source of a buzz was priced so low, I can't believe it was worth his while.
Bob

Actually I didn’t mean for this to come off negative and rereading it some of it does. Sorry!
Just meant that a lot of people would like to be more DIY with their tube equipment but don’t know where to start. I was just wondering if there was a way learn to do it, do you think people would be interested?

Some shouldn’t ride Harleys, or Skydive.      Some should never pick up a hammer(for any reason), or soldering iron(near tube gear).      Some things are harder to get killed with, than others.      Gravity and high voltages, can prove very unforgiving.      Then again; the only people that never fail, are those that never try.      AND; there’s only one way to learn self-reliance.      The competent generally aspire, to rely on themselves and are willing to learn(yes: they would be interested).

I will do maintenance such as replacing tubes, bias adj. and simple repairs like a switch, lamp, bias resistor, etc... but if I can't easily troubleshoot I will send it to a pro or ideally where it was made

Fortunately I have excellent soldering skills.  I started working for my uncle at 15 .   He used to make black boxes for cable and I would remove the PROM and solder in a socket so he could burn the descrambler PROM and plug it in.... I got "paid" with black boxes.for the work . I kept a few and sold a bunch.    I have been into RC for 30 years so that soldering skill was handy.  I also solder routinely for work where we use a Pace rework station.   

It's a skill that's easy to learn but takes a while to master ,  with the right tools and some practice anyone can do it