Tektronix 11B2 Delayed-Sweep Time Base

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Orig CostLow BidHigh Bidaverage
$950 (1973) ...

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    The 11B2 has delaying sweep, and time per division of 5 seconds down to 0.1 microsecond.
    Plugin made for the model 647 oscilloscope, and may work in the 647A.