This article discusses repair and calibration of the Sprague model TO-3 Tel-Ohmike Resistor-Condenser Analyzer. Serious electrical voltages are present, repairs should only be attempted by a qualified technician. Copyrighted by Bob Putnak, all rights reserved. Model TO-3 Tel-Ohmike “Capacitor Tester” is based on the older Sprague design.It is a balanced-bridge design with the following specifications: […]
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This article discusses repair and my calibration procedure of the Precision model 10-12 tube tester. Serious electrical voltages are present, repairs should only be attempted by a qualified technician. Copyrighted by Bob Putnak, all rights reserved. Introduction The Precision Apparatus Company (commonly known as PACO) manufactured some very high-quality test equipment. Among their offerings are
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This article discusses repair and calibration of the Signal Corp I-177 tube tester. Serious electrical voltages are present, repairs should only be attempted by a qualified technician. Copyrighted by Bob Putnak, all rights reserved. Introduction Model I-177 is a very old US Military dynamic mutual conductance tube tester that was used during World War II
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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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