Hi

Both my Hickok Cardmatics, KS-15874-L2 have been mothballed for about 10
years and both exhibit the same symptoms as well as both Cal. Cells are dead
(I've seen the reverse engineered schematic and wonder if anyone has had
success with repair or an external bypass.) I brought both up on a Variac,
no smoke and both draw a little over a 1/2 amp. Cal. B+ indicates the
meters are OK . For example neither will test a known good 12AX7, the meter
tries to go a little backward on Gm, and the 4 button lamp lights indicating
a dual section tube. Does anything come to mind of where I should start or
am I facing cleaning off the test bench and staring at hours of learning the
circuits for basic troubleshooting each mechanical and electronic section?
I kind of feel that there's a common fault that someone with lots of
experience might point out.

tnx & 73
hank wd5jfr