Classic Electronic Restoration, Vacuum Tube Audio, Technical History, Photography
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…
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…
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…
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,…
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.…