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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As a fan of vintage tube equipment, it should come as no surprise that I prefer older quality computer equipment. In this article, I explain how to repair “Scanner System Failure” problems in a vintage HP Officejet R-series multifunction scanner-printer. Model R40xi is shown in the photos, but all models (R40, R40xi, R60, R60xi, R80,
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This article will discuss repair and calibration of the NRI Professional model 70 tube tester. High voltages are present, repairs should only be attempted by a qualified technician. Copyrighted, all rights reserved. Introduction Built by Precision Apparatus Co for NRI, the high-quality craftsmanship of the NRI Professional model 70 tube tester is readily apparent. It
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(©2008 Bob Putnak, all rights reserved.) This article discusses repair and calibration information for a number of vintage capacitor testers that all use the same fundamental test circuit. The article currently covers the EICO 950-series, PACO C-20, Knight KG-670, Heathkit C-2 and C-3, etc. (More models will be added on an ongoing basis as I
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This article discusses repair and calibration of the older tube-based Sencore Mighty Mite tube testers that use the 12AU7A tube inside, models TC130, TC136, and TC142. High voltages are present, repairs should only be attempted by a qualified technician. Copyrighted, all rights reserved. Introduction Sencore Mighty Mite testers employ a Cathode Emission test circuit, with
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