A reader asked me why 12AX7 were testing weak on a BK 600 tube tester, but testing OK on a BK 707 (top panel Gm test). The 600/606, and the bottom panel of BK 700/707, will overdrive a 12AX7 at plate(cathode) current levels that a 12ax7 tube is not really designed to handle. [FYI – […]
why 12ax7 may test weak on BK 600-606 Read More »
This article discusses repair and calibration of the B&K 600 / 606 tube testers. Both models can share the same tube setup data book, and therefore both models are functionally equivalent. Model 606 will be example shown in this article. Electrical voltages are present, repairs should only be attempted by a qualified technician. Copyrighted
B&K 600-606 tube tester Read More »
This article discusses the solid-state B&K 607 / 667 tube testers. Both models use the same tube setup data book, and therefore both models are functionally equivalent. Model 607 will be example shown in this article. Electrical voltages are present, repairs should only be attempted by a qualified technician. Copyrighted, all rights reserved. This series
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I am frequently asked by B&K and Hickok owners to explain how to replace a #83 tube with a solid state version. This question is popular because #83 tubes are scare and expensive. Other benefits are increased reliability (no tube to wear down), less heat generated inside the tester case, and less load on the
Solid state replacement for #83 tube Read More »
©2008, Bob Putnak. All rights reserved. This article discusses the B&K 707 Dyna-Jet Dynamic Mutual Conductance tube tester, including repair and calibration. The discussion is also relevant to the B&K 700 (the 700 is almost identical except for socket configuration) and some of the information is applicable to the B&K 650. The B&K 707 tube
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