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The real question is, was that tube bad?
The finest NOS Telefunken tub can go for over $100; if it doesn't work it's worth nothing.
Maybe he thought the JJ was weak, maybe the tube wasn't the issue at all, maybe you need to communicate with the guy on a professional level and ask the reasoning of his decisions.
I am nothing other than professional with my repair guy. When I questioned why there was anything other than the tube I put in my amp, he pulled my tube out from the drawer in his repair room and put it back into my amp.
If the tube was weak or shot, the repair guy knew my feelings about what specific tube I would only use. There was no question about it.
However, what happened is I almost lost my tube (IMHO) for a tube that I did not want. That is the only point I was fully making. There is no extra anything. And if the tube was truely bad, then he would have told me it needed to be replaced.
It is not unusal for any of the parts or pieces of any amp to go bad. No problems with that at all.
Oh and by the way, I talk to just about anyone who works on my gear for long periods of time over the course of weeks until they can get my repair in and start working on it so I can know this person who I am going to trust with my gear.
I am certainly glad that there are some out in TB land that will trust their gear to anyone at the local repair shop or facility (personally I only take my gear to people I know).

I only use JJ Ecc83s tubes. Nothing was wrong with the tube. I am cooling off. Dropped the amp off to the guy is morning. Going to let him tell me what is wrong with it. However, my tube should have never been changed without my knowledge. And yes, anyone who works on my stuff should be ware that I have exact ideas about my tube and nothing will substitute what I prefer.
Again, did you make that clear to the guy before he worked on it??? - if not, you really can't bitch about him changing it out - it's really that simple...
- georgestrings
Apparently the OP did. Yes he should have at least made a reason known for changing the tube. I always TRY to return still usable tubes to my customers unless they are excessively weak, dead or microphonic. Most don't want them back even though I try to make it clear that spares are a good thing to have on hand.
I kinda feel sorry for the repair guy. You come off as a pain in the ... customer.
OK, I must have missed that... I suppose if it was discussed beforehand, then I could see the OP getting upset about something being done against his wishes... I will say that IMO/IME, one of those JJ tubes isn't anything special at all - and the tube choice in any single tube preamp doesn't usually make any earth shattering differences...
- georegstrings
^ agree. IME single 12AX7 pre's are more gimmick for the most part.