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Tektronix Type S
Diode recovery tester plug-in
Type S front view

Compatible with 500-series scopes

Produced from 1960 to 1967

(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

The Tektronix Type S is a 500-series plug-in for measuring semiconductor diode recovery characteristics.

It can be thought of as having two parts, a stimulus subsystem and a measurement subsystem. The stimulus comes from mercury switch that drives a 6GM8/ECC86 tube that operates in a current-steering mode. The measurement subsystem is a wideband amplifier that converts the single-ended voltage on the diode under test to the differential signal that the oscilloscope mainframe takes. One terminal of the diode is grounded.

Measurements with the Type S are typically made by applying a current step to the diode while observing the voltage across the diode.

The Type S was introduced in 1960 and produced through 1966.

Key Specifications

Current ranges Forward – 1, 2, 5, 10, and 20 mA; Reverse – 0, 0.1, 0.2, 0.5, 1.0, and 2.0 mA
Vertical Deflection 50 or 500 mV/div
Shunt Capacitance ~16 pF at 50 mV/div, ~9 pF at 500 mV/div
Rise time 1 ns


Some Parts Used in the S

Page Class Description Used in
12AT7 Vacuum Tube (Dual Triode) dual high-gain triode 161 180 310 310A 315 316 360 502 502A 512 513 513D 514 514AD 514D 516 524AD 529 RM529 544 546 547 556 3A2 3A75 1M1 A B C G H K L M N K R S Z
12AU6 Vacuum Tube (Pentode) RF pentode 81 112 512 556 575 545 549 581 585 A B C G K H L M N O R S Z
6AK5 Vacuum Tube (Pentode) RF pentode B C CA G K L S Z 517 517A
6GM8 Vacuum Tube (Dual Triode) dual triode 81 516 S