Although I can't find it there anymore, the site for Brent Jessee Recording, as I recall, did mention at one point who they consider to be the top guy to repair and recalibrate tube testers. Maybe you could email or call them.
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There was a woman who advertised in VTV magazine that repaired Hickock tube testors. You could email Charlie Kittleson the publisher; I'm sure he could put you in touch with her. I think her name was Sue Chaffee or something like that.
John_tracy, I believe your thinking of Kara Chaffee, she repaired my Hickok 752 a couple of years ago but is no longer doing repairs.
The only repair I know of presently is here:
Here's a Great page for general info on tubes and testers by Harry Straub
Thanks everybody for their responses. Although it's not showing in this thread, one of these links connected me to a Mr. Kennedy at alltubetesters.com . He seems to be a freindly individual, and his prices are reasonable. In addition he offers technical assistance, which is probably the way I'm going to skin this particular cat.