Tektronix CA 24MHz Dual-Trace Amplifier (1972)

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Quick Specifications / Photos
Detailed Specifications
Operating Instructions
Misc. Part Numbers

Samples of e-Bay Prices
Orig CostLow BidHigh Bidaverage
$280 (1969-Ltd Dmd)
$450 (1972)
...
$20.00 2/7/02 #1699881197 erippen
$4.99 12/16/02 #3100106026 www.sumcomputers.com
no bids (asked $19.99) 12/31/02 #3101665738 billw86@hotmail.com
no bids (asked $9.99) 1/3/03 #3103563542 spidermanz
$9.99 (buy it now) 2/2/03 #3309225184 lyntec (untested)
no bids (asked $20) 3/15/03 #2514467079 coinsrus.com (untested)
no bids (asked $1.00) 6/7/05 #7520280103 uh...clem (working)
$10.50 4/9/06 #7607885421 volfanjnick (2 bids $6.99 start) (untested)
$9.95 (+$14.95 ship) 3/8/07 #120094473370 bearlius_max (1 bid) (very clean-untested)
$38.78 (+~$14 ship) 1/7/08 #250202487086 icecreamgirlie (7 bids $4.99 start) (was working 10 years ago-tubes intact)

The 1969 Catalog recommends using the 1A2 instead of the CA.
QUICK SPECS / PHOTOS
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    SPECIFICATIONS
    TEKTRONIX Plug-in CA Dual Trace, Pre-Amp. Calibrated. .05 - 20 V/CM. DC coupled. .01 V. Sec. Tubes are (4) 12AT7, 6AL5, (4) 12AV6, (4) 12AU6, (2) 6AK5. 10 pounds shippimg weight.
    ====================================
    This is a two channel all-tube plugin which is interesting, because when the 533A is equipped with it, there is not a single transistor left in the whole machine. It is not interesting because it is a very good amplifier, because it isn't. Though usable, it suffers from extensive DC drift while warming up, and unfortunately, the input selector switches do not have a "GND" position, so there is no quick way to reset the trace to the middle of the graticule, short of disconnecting the probe, which is a drag.
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    CHARACTERISTICS

    GENERAL

    The Type CA Unit contains two identical amplifier channels that can be electronically switched either by the oscilloscope sweep or at a free-running rate of approximately 100 kc. When amplifier switching is accomplished by the oscilloscope sweep, the two signals to be compared appear on alternate sweeps. Because the sweeps are identical, and time-delay characteristics of the two amplifier channels are closely controlled, time comparisons accurate within 1 nsec can be made.

    AMPLIFIER TRANSIENT RESPONSE
    RisetimePassband
    With Instrument TypeINPUT SELECTRO switch in any position INPUT SELECTOR switch in either DC positionINPUT SELECTOR switch in either AC position
    541/541A,
    545/545A,
    555,581,585
    15 nsecDC to 24 Mc2cps to 24 Mc
    0.2 cps to 22 Mc
    with P6000 or P6017 Probe
    55116 nsecDC to 22 Mc2cps to 22 Mc
    0.2 cps to 22 Mc
    with P6000 or P6017 Probe
    531/531A,
    533/533A,
    535/535A
    23 nsecDC to 15 Mc2cps to 10 Mc
    0.2 cps to 10 Mc
    with P6000 or P6017 Probe
    53635 nsecDC to 10 Mc2cps to 10 Mc
    0.2 cps to 5 Mc
    with P6000 or P6017 Probe
    53270 nsecDC to 5 Mc2cps to 10 Mc
    0.2 cps to 5 Mc
    with P6000 or P6017 Probe

    Either amplifier channel can be used separately without electronic switching, making the Type CA also useful in all single-trace applications withing its frequency-response and sensitivity capabilities. Maximum flexibility is obtained by providing separate positioning, sensitivity, and polarity-inverting controls for each channel.

    Operating Modes

    Channel A only
    Channel B only
    CHOPPED (Electronic switching at 100 kc.)
    ALTERNATE (Electronic switching on alternate sweeps.)
    ADDED ALGEBRAICALLY (Both channels combined at output (A +or- B)

    Amplifier Sensitivity

    Basic deflection factor -- 0.05 v/cm, ac or dc.
    Nine calibrated sensitivities -- 0.05 v/cm to 20 v/cm, accurate within 3% when set on any one step.

    Input Impedance

    Plug-In alone 1 megohm shunted by 20 pf.

    10 megohms at 14 pf with P6000 or P6017 probe.

    P410 probe with plug-in will be 10 megohms at 7.5 pf.

    Physical Characteristics

    Construction -- Aluminum alloy chassis.
    Finish -- Photo-etched anodized panel.
    Weight -- 4 1/2 lbs.

    Above excerpt from Textronix CA Type Plug-In Instruction Manual
    OPERATING INSTRUCTIONS
    MISC PART NUMBERS
    Knobs
    366-029Knob, Large Black, 1/4 Hole Thru (Volts/CM)
    366-031Knob, Small Red, 1/8 Hole Part Way (Variable)
    366-047Knob, Small Black, 1/8 Hole Part Way (Polarity)
    366-033Knob, Small Black, 1/4 Hole Part Way (Vertical Position)
    366-033Knob, Small Black, 1/4 Hole Part Way (A,B,ALT,Chopped,Add)
    Pots/Switches
    R3338 / R4338311-279770 Ohm WW (Variable)
    R3361 / R4361311-0282 x 100K 2W Var. (Vertical Position)
    Tubes
    V3323154-0146AK5
    V3334154-04012AU6
    V3354154-04012AU6
    V3364*157-0596AU6 selected pair
    V3374*157-0596AU6 selected pair
    V3375154-03912AT7
    V3382154-0166AL5
    V3384154-03912AT7
    V3393154-03912AT7
    V4323154-0146AK5
    V4334154-04012AU6
    V4354154-04012AU6
    V4364*157-0596AU6 selected pair
    V4374*157-0596AU6 selected pair
    V4383154-03912AT7