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Originally posted in December, 2018 This post continues my restoration of the Hickok 209A VTVM, SN 1333254, Part 2 Hickok 209A VTVM Restoration Part 6: Component replacement decisions In this Part 6 of the series I will document the condition of the passive circuit components in the Hickok 209A VTVM, and justify why I decided…
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Originally posted in May 2021 The Racal Dana Model 9478 Frequency Distribution System has an internal precision, oven-controlled crystal oscillator, or it can be phase locked to an external signal derived from a GPSDO or other master oscillator. The system will automatically lock to an external signal above 100 mV, and with a standard frequency…
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Original posted in June 2022 This is an update to my previous post documenting my restoration/repair of two Tektronix Type 114 Pulse Generators. As of this writing I have completed some cosmetic work on the cabinets, front panels and carrying handles of both units. This includes cleaning and painting the cases, cleaning the front panels, knobs,…
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Originally posted in November, 2016. I recently acquired two HP/Symmetricom Z3805A GPS Disciplined Oscillator receiver/clocks. These units seem to have several different configurations both inside the box and of the box itself, but all appear to have: Inside the box, I have seen reports of: The box itself can be Samsung rack mount or HP benchtop.…
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Welcome Welcome to my redesigned site documenting vintage electronics restoration, vacuum tube audio and radio repair, and the history of technology. Here I share hands‑on projects, repair walkthroughs, historical research, and high‑resolution photos from my bench. Relaunch note I’m rebuilding the site from the ground up to replace ageing, hard‑to‑maintain code with a cleaner, more…
Shaun Merrigan
Classic Electronic Restoration, Vacuum Tube Audio, Technical History, Photography