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Originally posted in August 2017 HP 8903B Audio Analyzer PCB Pad Replacement Visual inspection of my recently acquired HP 8903B Audio Analyzer revealed that the polymer pads on the bottom side of the main PCB were seriously deteriorated: Besides making an unsightly mess, this residue may form corrosive products which, over time, could damage the PCB.…
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Originally posted in June of 2021 I recently completed repairing/refreshing and calibrating two Tektronix Type 114 Pulse Generators. This is a solid state pulse generator with variable pulse width (100ns – 10ms) and period (1us to 100mS). It can produce pulses of both polarities (-10v to +10v into 50 ohms). It was introduced in 1965.…
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Originally posted in December, 2018 This post continues my restoration of the Hickok 209A VTVM, SN 1333254, Part 1 Recall that the D-cell battery holder was badly corroded. Here is process I used to restore the battery holder: Once all the corrosion product was removed and neutralized I decided to prime and paint the battery…
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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…
Shaun Merrigan
Classic Electronic Restoration, Vacuum Tube Audio, Technical History, Photography