Tektronix TR501 100kHz-1.8GHz Tracking Generator for 7L12

Tektronix Catalog CostLow BidHigh Bidaverage
$3500.00 (1976-new)
$3900.00 (1978)
$4250.00 (1981-last)
...
$307.50 10/10/01 #1645813658 sales(astglobal) (missing knob)
No Bids (asked $399.99 + ~$20 ship) 11/12/10 #350411020988 toysnparts (tested-works fine)

The TR501 first appeared in the 1976 catalog but was last seen in the 1980 catalog (The TR502 was still in production and also able to work with the 7L12)
Production run = 6 years.
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    Tracking Generator for 7L12
    The TR501 is capable of the same performance with either the 7L12 or 7L13 Spectrum Analyzer.
    The TR501 is the more cost effective choice. (The TR502 also has provisions for dot marker function with the 7L13)

    A tracking generator is a signal source that follows the tuning of the spectrum analyzer. This instrument combination is ideal for making frequency response measurements. Because of the narrow bandwidth of the spectrum analyzer, the noise floor of an amplifier or system is reduced, allowing measurements with a dynamic range in excess of 120 dB. The tracking generator can also be used for precise frequency measurements, and is especially useful for measuring low-level signals in the presence of other higher level signals. The tracking generator derives its signal from the spectrum analyzer by mixing a local oscillator in the generator with the sweeping oscillators in the spectrum analyzer. A tracking generator is locked to the analyzer and can, by design, be no better than the analyzer in stability or drift.

    (excerpt from 1977 Tektronix catalog)