I am working on trying to restore an old, possibly 1956, VTVM. It is a Precision model 78 made by Precision Apparatus Co., It is battery powered, not A.C.
It appears to take 2 "D" cells and than another type battery of which I have no idea. It has 1 tube, 1U4.
I got the meter on ebay and looks complete. Has all probes. It's very clean inside and out and would like to put it back into use.
A schematic, manual, anything at this point would be useful.
I have tried bama.com. I also emailed a few online vintage manual sources. No luck. One response was that it is a rare unit and would be extremely lucky to find any info.
It appears to take 2 "D" cells and than another type battery of which I have no idea. It has 1 tube, 1U4.
I got the meter on ebay and looks complete. Has all probes. It's very clean inside and out and would like to put it back into use.
A schematic, manual, anything at this point would be useful.
I have tried bama.com. I also emailed a few online vintage manual sources. No luck. One response was that it is a rare unit and would be extremely lucky to find any info.