Unstable"zero" adjustment CT160

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Unstable"zero" adjustment CT160

Postby TubeKing » Mon Jan 19, 2015 9:21 pm

Hi Jack,

Wondering if you can help me here, while testing the CT160 that i'm restoring i used these instructions to measure Anode Current and GM of a 6L6 tube.
http://www.jacmusic.com/Tube-testers/AV ... INDEX.html
The problem what i have with both tests is that i cannot get the meter stable at "0" when turning the left anode current knob. I use the correct range and set it to "0", but shortly after it will go under or over it. Any thought what i need to check or clean?
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