Tektronix 3A74 2 MHz Four Trace Amplifier (1969)

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Orig CostLow BidHigh Bidaverage
$650 (1969)
$900 (1973)
...
$9.99 1/4/03 #3103630001 chef_howard (untested) (1 bid)
$26.10 6/30/05 #7527697139 sams995 (5 bids $9.95 start) (untested-clean)
$45.00 (+$9.95 ship) 5/6/08 #310046129820 npcstar (5 bids $0.99 start) (untested)
$19.99 (+~$13 ship) 7/25/09 #260449275909 21stcenturyalchemist (1 bid) (untested-6DJ8 tube missing)

  • Bandwidth : 2 MHz
  • Risetime : 0.17 µs
  • Sensitivity : 20 mV/div to 10 V/div
  • Input Impedance : 1 MΩ 47 pF


    The Type 3A74 is a general purpose plug-in unit for use in the Type 561B, 564B or 565 Oscilloscope. It can also be used in the Type 568 Oscilloscope when digital readout is not required. Used in the Type 129 Power Supply, it can drive recorders, X-Y ploters, oscilloscopes, and other indicators.

    BANDWIDTH
    DC to 2 MHz at 3-dB down. AC-coupled low-frequency response is 2 Hz, 0,2 Hz with 10X probe.

    RISETIME
    Approximately 0.17 µs

    DEFLECTION FACTOR
    20 mV/div to 10 V/div in 9 calibrated steps, 1-2-5 sequence; accurate within 3%. Uncalibrated, continuously variable between steps and to approx. 25 V/div.

    INPUT RC
    1 megohm paralleled by approx. 47 pF.

    MAXIMUM INPUT VOLTAGE
    600 V combined DC + peak AC.

    WEIGHTS
    Net wieght7lb3.2 kg
    Domestic shipping weight≈11 lb≈5.0 kg
    Export-packed weight≈15 lb≈6.8 kg


    RECOMMENDED PROBES
    P6028 - 1X
    P6006 - 10X
    P6007 - 100X

    (excerpt from Tektronix® Products 1973)