Tektronix L 30 MHz Fast-Rise Plug-In (1969)

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BAMA Free L Manual and Schematic Download Site

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

Samples of e-Bay Prices
Orig CostLow BidHigh Bidaverage
$235 (1969)
$375 (1972)
...
$5.00 12/4/02 #1922494962 hangar18surplus
$6.51 12/20/02 #3101090182 hangar18surplus
no bids (asked $9.99) 5/5/05 #7517429080 nac98 (was working)
$17.02 6/21/05 #7523955387 the-macservice-group (3 bids $4.99 start) (untested, tubes missing)
$9.99 (+ ship 7 lb) 11/6/06 #180047763198 forrest62 (1 bid) (untested)
$10.50 (+? ship) 5/2/08 #290225651112 findersjeepers (2 bids $9.99 start) (untested-has all tubes)
$15.51 (+~$14 ship) 7/28/08 #360072852796 sunnking (2 bids $14.99 start) (untested)
$32.67 (+~$13 ship) 8/21/08 #360079626028 sunnking (8 bids $14.99 start) (untested-has all tubes)
$13.27 (+~$15 ship) 4/4/09 #170315925535 tommydo (3 bids $8 start) (untested-has all tubes)
$18.27 (+~$14 ship + $4 handling) 5/26/09 #120422932121 forrest62 (2 bids $9.99 start) (untested-seems complete)

QUICK SPECS / PHOTOS
  • DC-to-30 MHz fast-rise high-gain
  • Rise time .006uS
  • .05 - 20 V/CM AC/DC coupled
  • .005 - 2 V/CM AC coupled ( x10 gain)




    SPECIFICATIONS

    General Information
    The Type L Plug-In is a fast-rise, high gain, calibrated preamplifier designed for use with the Tektronix 530-, 540-, 550-, and 580- Series oscilloscopes. (Type 81 Plug-In adapter must be used with the 580-Series Oscilloscopes.) The unit contains a fast-rise DC amplifier similar to the Type K Plug-In Unit, plus a fast-rise high-gain AC amplifier which may be used to increase the sensitivity by a factor of 10.

    The L Unit alone has a risetime of 6 nanoseconds in AC or DC and 10 nanoseconds in X10 GAIN AC. Table 1-1 summarizes risetimes and bandwidth (upper bandwidth figure measured at a 3 dB point) when the L Unit is used in combination with various types of Tektronix oscilloscopes.

    Vertical Deflection Factors

    AC or DC position of AC-DC switch: 0.05 to 20 volts per centimeter in nine calibrated steps; also continuously variable (uncalibrated) between steps, and up to approximately 50 volts per centimeter.

    X10 GAIN AC position of AC-DC switch: 0.005 to 2 volts per centimeter in nine calibrated steps; also continuously varible (uncalibrated) between steps, and up to approximately 5 volts per centimeter.
        Step Attenuator (VOLTS/CM switch) Accuracy

    Within 3% of front-panel reading for all positions of VOLTS/CM switch.

    Input Characteristics

    Type L Plug-n Unit: 1 Megohm shunted by 20 picofarads.
    Type P6017 Probe: 10 Megohms shunted by 14 picofarads.
    Type P6000 Probe: 10 megohms shunted by 11.5 picofarads.
    Type P510 Probe: 10 Megohms shunted by 14 picofarads.
    Type P410 Probe: 10 Megohms shunted by 8 picofarads.

    Maximum Allowable Combined DC and Peak AC Input

    600 volts, AC-coupled.
    TABLE 1-1. TRANSIENT RESPONSE AND BANDPASS
    Type L Unit
    with Oscilloscope
    Type:
    RISETIME in nanosecondsBANDWIDTH
    Coupling
    AC or DC
    Coupling
    X10 GAIN AC
    Coupling
    DC
    Coupling
    AC ***
    Coupling
    X10 GAIN AC
    5327070DC to 5 MHz2 Hz to 5 MHz3 Hz to 5 MHz
    544
    541/541A
    543/543A/543B
    545/545A/545B
    546/547
    549
    555
    556
    1215DC to 30 MHz2 Hz to 30 MHz3 Hz to 24 MHz
    531A
    533/533A
    535A
    2323DC to 15 MHz2 Hz to 15 MHz3 Hz to 15 MHz
    *581
    *585
    1215DC to 30 MHz2 Hz to 30 MHz3 Hz to 24 MHz
    5511416DC to 25 MHz2 Hz to 25 MHz3 Hz to 22 MHz
    531
    535
    536
    3135DC to 11 MHz2 Hz to 11 MHz3 Hz to 11 MHz
    * Type 81 Plug-In adapter must be used with the 580-Series Oscilloscopes
    *** AC low-frequency response is extended to 0.2 Hz with 10X probe.

    above excerpts from Tektronix Type L Plug-In Instruction Manual
    OPERATING INSTRUCTIONS
    Markings and Functions of Controls

    On the front panel of the L Unit, red markings are related to the red VARIABLE knob, blue and black markings are related to the black knobs. The black-numbered scale around the VOLTS/CM switch is used when the AC-DC switch is in AC or DC position, and the blue scale is used when the AC-DC switch is in X10 GAIN AC position.

    First-Time Operation

    To set the oscilloscope/Type L Plug-In Unit combination in operation for the first time the following procedure is suggested:

    1. Insert the Type L Unit into the plug-in compartment of the oscilloscope and tighten it with the securing rod.
    2.Set the front-panel controls as follows (controls not mentioned may be in any position):
    Oscilloscope:
    POWERoff
    INTENSITYfully counter-clockwise
    HORIZONTAL DISPLAYNORMAL ("A", INTERNAL SWEEP)
    MAGNIFIER (5X MAG.)OFF
    Main Sweep Controls:
    TIME/CM0.5 MILLISEC
    VARIABLE, TIME/CMCALIBRATED, fully clockwise
    TRIGGER SLOPE-INT.(-)
    TRIGGERING MODEAC (AC SLOW)
    (TRIGGERING SOURCE)(INT.)
    STABILITYfully clockwise
    TRIGGERING LEVELfully clockwise
    Type L Plug-In Unit:
    AC-DCDC
    VOLTS/CM0.5 (black numbers)
    VARIABLE, VOLTS/CMCALIBRATED, fully clockwise
    3.Connect the power cord to the instrument and to the source of power.
    4.Turn ON the POWER switch. Allow a minute for the filaments to heat and the time-delay relay to operate.
    5.Before increasing the intensity, center the trace vertically with the VERTICAL POSITION control, using the Beam Indicator neons of the oscilloscope as a guide. (When both vertical Beam Indicator neons are unlit, the trace is approximately centered.
    6.Rotate the INTENSITY control clockwise until the free-running trace appears on the crt. Center the trace with the vertical and horizontal positioning controls.
    7.Adjust the FOCUS, ASIGMATISM and INTENSITY controls to obtain a sharp trace with adequate intensity.
    8.Let the instrument warm up for at least 15 minutes before making any adjustment changes or accurate observations.

    above excerpts from Tektronix Type L Plug-In Instruction Manual
    MISC PART NUMBERS
    Knobs
    366-040Knob, Large Black, 1.375 OD 1/4" hole thru (VOLTS/CM)
    366-038Knob, Small Red (Variable)
    366-028Knob, Large Black, 1.225 flange (Vertical Position)
    366-028Knob, Large Black, 1.225 flange (AC-DC X10 Gain)
    Pots/Switches
    SW5002260-173Rotary Switch (AC-DC X10 Gain)
    SW5052260-172Rotary Switch (Volts/CM)
    R5362050-171680 ohm var WW (VARIABLE)
    R6522311-0282 x 100k var (VERTICAL POSITION)
    R6392311-0125k 2w var (Gain Adj)
    R6052050-035270 ohm var ww (X10 Gain Adj)
    R6242311-026100k 2w var (X10 DC Bal)
    R6812311-003100 ohms var (DC Bal)
    Tubes
    V5832157-0117-005654 Checked
    V5942154-0845654 (or 6AK5)
    V6042154-0845654 (or 6AK5)
    V6132154-0845654 (or 6AK5)
    V6242157-0388426
    V6342157-0388426
    V6632154-03912AT7
    V6732154-03912AT7