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Author Topic: Need assistance with tube tester  (Read 1422 times)
N4UE
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Posts: 904




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« on: November 14, 2003, 08:39:31 PM »

Hi all. I have a very mint Weston Model 981 tube tester that has a problem. This tester uses an internal oscillator (5 kHz) fed to the tube under test for checking Mutual Conductance (Gm). The problem is that the osc won't operate. I suspected bad caps (typical in equipment this old). The bypass and coupling caps were very leaky but the 3A4 tube is still not doing it's thing. I have another 'emission / short / leakage' tube tester, and the 3A4 checks good.
I have the schematic but the problem still evades me.
When the spring loaded Gm switch is operated, B+ is applied to the plate of the 3A4, (as it should) but still no 5 kHz output from the tube.
Does anyone have any experience with this model of tube tester?

thanks in advance!

ron

N4UE
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