B&K 607 – 667 Tube Tester

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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Repairing HP Officejet R-series

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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