Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12, 2025) x

Thread Closed

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



Users browsing this thread: 2 Guest(s)
[-]
Recent Posts
54C Complete Teardown/Rebuild
I don't think that I have encountered a 12Z3 before, curious how it uses one of those but includes a #43, which is a 25 ...Arran — 02:17 PM
HiFi (Chifi) tube amp build - but my own design.
It's the other forum. I'm also in DIY, but mostly read there. Honestly, I kinda jumped into this without much thought to...TV MAN — 10:43 AM
Philco 71 Code 125
Hello,  I am in need of a schematic for this radio. Mine has the three separate circular tube shields and a shadow me...dconant — 08:06 AM
Stromberg Carlson 1500 Squeal
And life just keeps getting more complicated.dconant — 07:57 AM
54C Complete Teardown/Rebuild
Hello Roy, here is this one sincerely Richardradiorich — 12:45 AM
54C Complete Teardown/Rebuild
Richard, Had grabbed it already but thank you just the same.  I find myself wanting to find some way to block out the...glyphmon — 12:03 AM
54C Complete Teardown/Rebuild
Hello roy, here is a link to the schematic . Sincerely Richardradiorich — 11:54 PM
54C Complete Teardown/Rebuild
Richard, The Silvertone 2014 also is a transformerless set, so I am incorporating a 1:1 600 ohm audio isolation transfo...glyphmon — 11:37 PM
Preliminary work on wife's Silvertone 2014
Did an alignment today which was interesting.  IF alignment went great, almost all was already spot-on.  Adjusting on th...glyphmon — 11:35 PM
54C Complete Teardown/Rebuild
The main problem with adding a Bluetooth input is that this set lacks a traditional power transformer to isolate it from...radiorich — 11:19 PM

[-]
Who's Online
There are currently 2272 online users. [Complete List]
» 1 Member(s) | 2271 Guest(s)
Avatar

>