Up for auction is a Hickok 600A Micromho Mutual Conductance(Gm) Tube Tester. I strive to make sure you are happy with your purchase. And should something arrive not as it should be- contact me before leaving feedback. Shipping is $40.00 for lower 48 states- more for Alaska and Hawaii. California residents must add 8% sales tax. The comprehensive listings over comes that problem. The only issue is that while the roller runs free. Should you need exact readings, you will have to have it calibrated. This one is not guaranteed to be calibrated. more of the manual and about the most complete set of tube settings charts you will find anywhere( 122 pages) As with most old vacuum tube testers. The"English" scale can be used two ways: as a simple good/bad reading, and as a calibrated Gm scale 0-3000/6000-15000. Three socket savers are already installed. Of special interest is the ability of this tester to measure the very oldest of tube such as the two digit numbered ones like 40, 80 etc. This tester will handle: 4.5,6,7,8 pin large base tubes 8 pin octals 7& 9 pin miniatures 8 pin micros 8 pin in line tubes. Its the only way to truly match tubes in amplifiers. Its actual amplification factor is measured as a Gm value on the meter. It applies individual voltages to all elements and sends a varying ac signal to the grid of the tube under test. HICKOK 600A VACUUM TUBE TESTER- MEASURES Gm This tube tester is superior to the simpler emission testers for sale.
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