Shaun Merrigan

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

Tag: Electronics Repair

Tektronix SG5010 Audio Signal Generator Repair

13/11/2025

Restoration of Classic Electronic Test Equipment, Tektronix

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…
Racal 9478: Widespread Electrolytic Capacitor Failure

13/11/2025

Restoration of Classic Electronic Test Equipment

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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