I have 3 Hickok tube testers all model 6000. Two of the units I cannot get to line adjust. The other has no meter at all. Where would be a good starting point after replacing the tubes to check for problems? I have not been able to find any information on the model 6000 ? The 6000a is different. Anyone know of a sight that has some information on the 6000? Somewhere I read that the meter could be replaced with a digital meter. Where would I find the information on this conversion? Any help or information for these testers would be greatly appreciated.
JB

See http://www2.gdi.net/~padgett/hickok.htm for
calibration info.

I am told that this company has a large inventory of Hickok Tube Tester Parts if you should have need for same.

www.scherrerinstruments.com