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Originally posted in March 2022 I recently completed the construction of a PC controlled vacuum tester: The Roetest. This is a computer-controlled tube tester which works as follows: Construction Details: Using the PC software, load the data for the TUT (Tube under Test). Pinout and base connection information is taken from an extensive database of…
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Originally posted in January, 2022 The BK Precision 879B is a good quality, dual display 40,000 count LCR (inductance, capacitance, resistance) meter with 0.1% basic accuracy. It was first manufactured in 2010 and is still available (2021) for around $420 Cdn. I purchased mine several years ago and find it very convenient and easy to…
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Originally posted in December, 2018 Early in 2018, I purchased an HP 3562A Dynamic Signal Analyzer for an excellent price on Ebay. The display looked great and it was physically in good condition. However, the unit failed the power on self test as follows: This error code indicates a ROM IC failure. HP3562A Diagnostic LED’s…
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Originally posted in March, 2018 I purchased a couple of HP 1340A XYZ Displays which I thought would be useful as troubleshooting aids and as graphical displays of CRT technology (oscilloscope clocks, and the like). Upon receiving them, they both worked, but careful visual inspection showed some potentially serious problems. I will document the repair…
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Originally posted in August 2017 Tektronix 7854 Waveform Keyboard Rebuild From the Tek Wiki: The Tektronix 7854 Waveform Processing Oscilloscope, introduced in 1980, is a 400 MHz combined analog / digital mainframe in the 7000 series that takes two vertical and two horizontal 7000-series plug-ins. In addition to a conventional analog (real time) scope, it contains an…
Shaun Merrigan
Classic Electronic Restoration, Vacuum Tube Audio, Technical History, Photography