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EL34 tube problem on HICKOK 539B tube tester!!
Hi:
I have one Mullard EL34 tube. I test it on my HICKOK 539B tester. I turn the tester power on after 1-2 minutes the micromhos meter is read on 5600. But test after power on approximately 6-7 minutes the micromhos meter indicator is reverse and turn the BIAS VOLTS VR is no function. I test other EL34 tubes have no any problem on the 539B tester. Does the Mullard el34 or the tester have any problem ? Please help me to close the problem. Thanks and Regards!! |
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