3A3

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Tektronix 3A3
Dual trace differential amplifier plugin Type 3A3 front view (SN 4990 up) Compatible with 560-series scopes Produced from 1964 to 1972 Manuals Tektronix 3A3 Manual (early) (PDF) / (DjVu) Tektronix 3A3 Manual (late) (PDF) / (DjVu) Tektronix 3A3 Factory Calibration Procedure, June 1968 Tektronix 3A3 Calibration Outline (PDF, OCR) (All manuals in PDF format unless noted otherwise)

Manuals – Specifications – Links – Pictures

The Tektronix 3A3 is a dual trace differential amplifier for 560-series scopes. It was designed by Roy Hayes.

Key Specifications

Bandwidth	500 kHz or 5 kHz (switch-selectable)
Deflection	0.1 mV/Div to 10 V/Div, 1−2−5
Input impedance	1 MΩ // 47 pF

Internals

Early 3A3s use a 7586 Nuvistor for the front end cathode follower. Serial numbers 4990 and up use a dual JFET.

Pictures

Older version (below SN 4990, Nuvistor in input stage)

Front
Right side
Left side
Nuvistor in input stage

Newer version (from SN 4990 up, FET in input stage)

Front
Right side
Left side
Top
Bottom
Dual JFET in input stage

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