tester calibration

I wasn't aware it was that difficult to calibrate these. Do you have the manual?

you could try music technology in springfield va. Not sure they do this but they do work on a lot of vintage tube gear and they are great to deal with

Go to Ebay and type in this number under the Ebay Search
280177488657 It will be for a B&K 747 calibration service.
They may have manuals, etc. I know they can perform the service. The calibration may not be hard but if your unit requires tubes you have to have the calibration tube in it. If it is solid state it may be much easier and maybe not require anything but the turn of a few buttons. Do a google search for the model you have along with the word manual and you should get some hits. Ctech may be able to help too.
Alltubes.com is a nice site too. I've been there before as well. You may be able to get a manual from them there.

Good Luck

Contact William Waters AKA The Hickok Doc at [email protected] He is located in Mt. Airy Maryland.