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Precise 111m tube tester restoration
#12

Kenneth, here it the shot of the cap that was across the meter originally. It looks like an electrolytic to me. It looks original. The meter is still 'bouncy' even with the new cap. I wonder if this is correct or if there should be something else in there? It doesn't show this on the schematic.
   

I attempted calibration last night. It was out quite a bit, but not quite as much as I expected. Some of the pots were a little scratchy, but a few quick rocks with the adjuster cleaned them up. All went pretty well, according to the instructions - UNTIL I got to the point to calibrate the Em current. NOTHING! Double checked my settings, verified with another set of instructions, still nothing. Tried a different meter, - same, nothing. It is the step where you set the 6L6 for Em test, then put milliamp meter between the plate and grid jack on the front of the tester, then use the bias control to set for 20 ma, then set P11 for 3 on the 10v bias scale.  Soooo - could be the reason why this tester was never used?? Going to check resistors and controls around the Gm Em switch, shunt etc, voltages on the plate and screen switch, and see what is there - or not.

If I could find the place called "Somewhere", I could find "Anything" Icon_confused

Tim

Jesus cried out and said, "Whoever believes in me , believes not in me but in him who sent me" John 12:44


Messages In This Thread
Precise 111m tube tester restoration - by TV MAN - 05-27-2016, 11:00 AM
RE: Precise 111m tube tester restoration - by TV MAN - 07-09-2016, 10:46 AM



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