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Old 12th February 2012, 12:21 PM   #1
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Join Date: Aug 2011
Default AVO CT160: Testing dual triodes

I have recently acquired AVO CT160 tester. Calibration looks fine and have had test several tubes. Testing 12A*7 tubes have been ok but I am stuck with the 6DJ8/ECC88/6922/CCa.

I started the test following this procedure:
Avo CT-160 in use

Testing the first half of triodes at A1 electrode selector go well but when switch to A2 electrode selector the meters went very bad either to the left or right of the edge.

I have changed the anode current but still did not solve the problem and it's strange to have an extreme different of anode current on a known and tested tubes.

Can anybody help or share if have similar experience?
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