I have a Superior model 616 tube tester the meter seems to be frozen... is there somewhere I can go for a replacement for this?

Dan, There used to be a guy that advertised in Antique Radio Classified - "Ye Old Meter Cellar" or something like that - he sold and repaired meters. I have not seen his ads in some time now and he may not still be around - but perhaps you can email Antique Radio Classified (ARC@antiqueradio.com) and ask.

Looking around I found this listing: "Leonard Cartwright - Restores & repairs old meters, moving coil, hot-wire and AC pre 1930. “Ye Olde Meter Cellar”, 23453 Rolling Hills Ct., Auburn, CA 95602. 530-268-9170". Yours is not pre-1930 - but perhaps he knows who can help you out.....