Tektronix 1L5 Spectrum Analyzer Plug-In Unit (1969)

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Tek Catalog CostLow BidHigh Bidaverage
$1025 (1969)
$1300 (1973)
$1700 (1974)
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$74.55 1/13/03 #3105591724 recycledgoodies (6 bids $50 start)
$68.00 1/24/03 #3108704015 rocker-boy (untested) (5 bids $10 start)
$53.00 3/12/06 #7596115094 mvannelli (9 bids $0.99 start) (untested - some damage to knobs)
$122.50 4/11/06 #7607710558 o3enterprises (13 bids $9.99 start) (untested - nice cosmetically)
$120.07 (+$10 ship) 6/14/09 #160341488469 richardnelsonauctions (4 bids $49.99 start) (no testing ?-refund if DOA)

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    The Center Frequency Range is 50Hz-990kHz, making it useful for most kinds of audio measurements. The Dispersion (Hz/cm) can be set in steps from 10Hz to 100kHz. The input attenuator can be set in 22 steps from 100V/cm down to 1mV/cm. The vertical display can be set for linear or logarithmic, and the unit has ">60dB" dynamic range (noise level =<5 microvolts). The useful sweep rates are low (20ms recommended) and the sweep output of the scope is applied to the sweep input terminal of the 1L5.
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    Tektronix 1L5 Spectrum Analyzer plug-in. The 1L5 has a rated bandwidth of 50Hz to 1MHz so it is ideal for audio and low frequency RF applications. This plug-in is designed to work with the early Tektronix 530, 540, and 550 series of oscilloscopes. It will work with some other series with the proper adapters.