Shaun Merrigan
Classic Electronic Restoration, Vacuum Tube Audio, Technical History, Photography
Tag: Shaun Merrigan
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Originally posted in December 2023 Background The Tektronix SG5010 is an audio signal generator plug-in for the TM5000 modular test equipment system. It can generate five waveforms: sine wave, square wave, SMPTE/DIN intermodulation test signal, CCIF intermodulation test signal, and sine wave burst. All these signals may be swept in frequency and amplitude. It can generate…
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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.…