Tektronix WR501 Word Recognizer

Tektronix Catalog CostLow BidHigh Bidaverage
$1500 w/ probes (1977-new)
$2000 (1982)
...
$52.00 8/15/01 #1626041837 sales (TM503, WR501 & LA501W)
$49.95 9/2/01 #1631699797 kurtmcd
$28.50 8/7/04 #3831560262 sams995 (6 bids $10 start) (untested)
$36.00 (+~$11 ship) 7/19/07 #330146615643 ridge_equipment (3 bids $19.99 start) (untested)
$48.56 (+$10 ship) 7/11/09 #280369014586 buttonbright (7 bids $0.99 start) (testing not mentioned-returnable)

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    Tektronix WR501 description:
    Sixteen data inputs plus a clock and qualifier. Word selection by 16, three position toggle switches. Modes are synchronous or asynchronous. Two delay modes. For use in TM500 series power module.