HICKOK 539B tube tester problem!
Hi All:
I have a HICKOK 539B TUBE TESTER. It working in excellent condition. Few days ago , I just change the 83 rectifier tube. Then i test the power tubes or preamplifier tubes. The GM read value over the micromho metter. I change the original 83 tubes. The same effect. Anybody can give me any better solutions for the problem I would be thankful. Please e-mail liu |
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