I heard a low buzz few tubed failed and passed. The main system did turn on and was able to test 4 different tubes I had laying around.
Because, I did not ground the wire and power cord is due for a replacement tested to on it powered but light turn.
This will need calibration from a service technician. The Hickok 123a is a true mutual conductance tester and holy grail of cardmatic. With scuffs, scratches, dings or marks and some surface corrosion. I have somewhere near 500 cards also the calibration set of coming.
No manual but copies are available. The system seemed to function.
specifications cassettevintagee:
brand: Hickok
model: 1234
type: Tube Tester
Ratings:
Everything was wrapped up really nice! 08-03-17
all is good 08-02-17
item came really fast thank you 07-31-17
Fast shipment and item was as advertised. 08-03-17
I-177 Hickok Tube Tester Calibrated Mutual(35.6% similar) Shorts test good, it could a good exit bath on switches, etc. Also accurate in rectifiers, shorts test good. Line check is good. Here is a nice solid Hickok I-177 tester from an estate collection. Chris hated calibrated vintage tube services lab in Rockford mi. Photo copy of article on this tester ...(February 25th, 2017)