Hi
If you can get out to Queens you can give Scott Grammlich a call.
SG Custom Sound
40-33 235th Street
Douglaston, NY 11363
718-224-5083
http://www.sgcustomsound.com/services/index.htm
Scott has fixed various gear for me and he has always been professional and has done quality work. Whenever I've been to his shop he has some kind of tube amp on his bench.
Also check out this thread for more info about techs in the NY area.
http://forum.audiogon.com/cgi-bin/fr.pl?aamps&1326121810&openfrom&1&4#1
Good luck