Here is an HP 8443A Tracking Generator-Counter. The restore signal on this unit is not working. The tracking generator, counter, and markers are working. Cosmetically this piece is in pretty good used shape though it is a bit dirty from previous use. Sold as is.

The HP 8443A Tracking Generator-Counter covers the 100kHz to 110MHz frequency range of the HP 8553B. It has a built-in counter, and precision RF attenuators. The 8443A can measure frequencies to an accuracy of +/-10Hz. When it is operated in the Track Analyzer mode, the counter will read the frequency at a tunable marker which is generated on the analzer CRT. The Restore Signal mode is a more convenient way to measure signal frequencies in wide scans because the counter reads the signal frequency automatically without fine tuning. The 8443A may also be used externally as a 120MHz direct reading counter.

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