Tektronix O 25 MHz Operational Amplifier Plug-in (1969)

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Orig CostLow BidHigh Bidaverage
$560 (1969)
$825 (1973-Ltd Dmd)
   
$49.00 12/22/05 #7573284294 sunnking (5 bids $9.99 start) (untested)
$14.95 (+~$17 ship) 8/11/07 #140144902440 rjc333 (1 bid) (untested)
$76.01 (+$25 ship) 1/2/08 #120202543446 smsithacany (5 bids $29.99 start) (in 132 Power Supply-untested)
$29.99 (+free ship) 1/8/08 #290196844386 strat112 (buy-iy-now) (was running fine)
$28.00 (+~$11 ship) 5/22/08 #250248426559 friends_of_marcus (3 bids $19.99 start) (untested)
$41.77 (+$12 ship) 7/13/09 #290329529461 tomelcam (3 bids $24.99 start) (clean-"is a working unit")

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    This unusual device plugs into any 530-540-550 scope mainframe. It provides two (vacuum-tube) op amps whose input and feedback impedances are selected by rotary knobs or plugged into the panel. The user can implement filters, integrators, differentiators, or gain blocks and display the output on the scope.