Tektronix 3A72 (72) 650 kHz Dual-Trace Amplifier (1969)

Back to Tek Vintage Summary Page
BAMA 3A72 Manual Download Site

Tektronix Catalog CostLow BidHigh Bidaverage
$295 (1969)
$450 (1973)
...
no bids (asked $25) 7/9/04 #3826884031 simplymarvelous2 (untested)
$9.95 3/12/06 #7598106527 gsnelljr (1 bid) (tubes tested ok-w/cd manual)

  • Bandwidth : 650 kHz
  • Sensitivity : 10 mV/div to 20 V/div
  • Input Impedance : 1 MΩ 47 pF




    The Type 3A72 Amplifier is a general-purpose dual-trace plug-in unit that has two separate channels, each with identical characteristics. The unit can operate in any of five operating modes for a variety of single and dual-trace displays. This unit can be used in the Type 561B, 564B, or 565 Oscilloscope. It can also be used in the Type 568 Oscilloscope when digital readout is not required.

    BANDWIDTH
    DC to 650 kHz at 3-dB down. AC-coupled low-frequency response is 2 Hz, 0.2 Hz with 10X probe.

    DEFLECTION FACTOR
    10 mV/div to 20 V/div in 11 calibrated steps, 1-2-5 sequence, accurate within 3%. Uncalibrated, continuously variable between steps and to approx. 50 V/div.

    INPUT RC
    1 megohm paralleled by approx. 47 pF.

    MAXIMUM INPUT VOLTAGE
    600 V combined DC + peak AC.

    OPERATING MODES
    Includes Channel 1 only (normal or inverted); Channel 2 only; Alternate -- Channel 1 and 2 switched electronically on alternate sweeps; Chopped -- successive 16-µs segments of each channel are displayed at an approx. 30-kHz rate per channel. Chopped transient blanking is provided; Added -- outputs of Channel 1 and 2 algebraically added.

    MULTIPLE X-Y DISPLAYS
    Obtained with two Type 3A72 Plug-In Units; both synchonization and automatic pairing are provided. With two Type 3A72's operated in the dual-trace mode, Channel 1 of the left-hand unit is always plotted against Channel 1 of the right-hand unit.

    WEIGHTS
    Net wieght5lb2.3 kg
    Domestic shipping weight≈9 lb≈4.1 kg
    Export-packed weight≈14 lb≈6.3 kg


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

    (excerpt from Tektronix® Products 1973)