I can find nothing wrong. Checks diode tubes ok. When you push the LINE voltage test, does it swing the right way? Possibly somebody swapped the leads to the meter? The Hickok commercial testers A, A, etc use a 49 lamp as a fuse in the bias circuit. If it is open the meter will deflect backwards. It is separate from the 81 which is used as a mains fuse. I don't know if the military testers use a bias fuse or not.
Update, thanks to all for your efforts and comments. I did clean the heck out of all rotary and push button switches using contact cleaners, but as it turns out that was not the problem. It checked rectifiers tubes ok and meter test was normal, that led me to start checking the precision resistors. Long story short, I replaced a total of 5 with carbon resistors matched with my Leads Northrop galvanometer resistance decade box. The only explanation I have is that constant temperature change and the aging of the plastic bobbins broke the fine wire at solder points on the bobbins.
Western Electric. Antique Tubes. Transmitting Tubes. Audio Triodes. Audio Pentodes. Tube Tester Manuals The following tube tester manuals are available at any time. I have listed everything that I have, so if you don't see the manual that you need listed, it is not yet available.
Operating Instruction with Schematic. Tube Set-Up Chart. Tube Set Up Chart. TT-1 Tube Tester. Hickok Instruction Manual Wit Schematic. Foreign Tube Roll Chart Supplement contains tubes not on roll chart.
Obsolete Tube Roll Chart Supplement contains tubes not on roll chart. Not Available Yet--I need this one. Foreign Tube Roll Chart Supplement includes tubes not on roll chart. Obsolete Tube Roll Chart Supplement includes tubes not on roll chart. Roll Chart In Book Form. Hickok A. Obsolete Roll Chart Supplement contains tubes not on roll chart. Instruction Manual With Schematics.
Price Each. Knight A. Precision Set Of Roll Chart Supplements. Covers models Precision , , , , , , , , , , , , , Paco T
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