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Tektronix 3T6
Programmable sampling sweep plug-in
Tektronix 3T6

Compatible with 560-series scopes

Produced from 1969 to (?)

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

The Tektronix 3T6 is a sampling plug-in for 560-series scopes. It is particularly suited, and programmable, when used in a 568.

In addition to the usual two 560-series connectors on the rear of the plug-in, the 3T6 has two extra connectors, J24 and P23. J24 is used for programming the 3T6. P23 is a coaxial feed (via a Gremar connector) of the trigger input signal. Both of these connectors mate with corresponding connectors in the 568.

The 3T6 contains a digital delay that controls the time between when the trigger event is recognized and when the sweep ramp is started. The purpose of this delay is the same as any delayed sweep: to zoom in on a region of a waveform that is not immediately after the trigger event. The digital delay in the 3T6 can be controlled by digital rotary switches on the front panel of the 3T6 or remotely, through the 568, via connector J24.

Mod 651C give 100 / 1000 samples/sweep switch. The original has 1 / 1000 samples/sweep switch. Later units appear to have the 100 / 1000 switch as standard.

The indicator lamps in the 'Time/Div' display can occasionally burn out. They can be replaced with 5V, 80mA, 2.5mm x 4.5mm, 'grain of wheat' style lamps.

Key Specifications

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Some Parts Used in the 3T6

Part Part Number(s) Class Description Used in
SMTD994 152-0177-01 Discrete component 10 mA, 2 pF tunnel diode 067-0587-01 067-0580-00 3T5 3T6 485 5S14N 7D14 7T11 7T11A S-53
SMTD995 152-0140-01 Discrete component 10 mA, 8 pF tunnel diode 1S1 1S2 1502 21A 22A 3T5 3T6 475 475A 475M 544 R544 546 RM546 547 RM547 556 R556 581A 585A RM585 7B52 7B53N 7B70 7B71 7D10 7D11 7T11 7T11A R7912 S-51 S-52 TU-5 067-0572-00 067-0572-01 067-0681-00