Tektronix 503 450 kHz Differential Oscilloscope (1971)

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Tektronix Catalog CostLow BidHigh Bidaverage
$660 (1969)
$850 (1971)
...
$50.01 4/20/05 #7508232113 hoshikitsuneomega (10 bids $10 start) (tested)
$19.95 (+$25 ship) 11/23/06 #170050901268 kbjp6564 (1 bid) (has beam)
$41.00 (+$25 ship) 7/4/07 #170126069256 tonga94 (4 bids $14.99 start) (get green line)
$0.99 (+~$33 ship) 6/11/09 #140324491922 monster-deals2 (1 bid) (untested)
$14.99 (+~$36 ship) 8/3/09 #190324621571 sunnking (2 bids $14.99 start) (trace shown on screen)

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