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Tektronix 1A5
50 MHz Differential Amplifier
Tektronix 1A5 Differential Amplifier

Compatible with 500-series scopes

Produced from 1967 to 1975

Manuals – Specifications – Links – Pictures

The Tektronix Type 1A5 is a differential amplifier plug-in for 500-series scopes. It was designed by Bill DeVey after consultation with John Kobbe.

It has an Amphenol 165 series connector on the front panel for direct connection of the Type P6046 Active Differential Probe.

Type 1A5 was introduced in 1967, replacing Types W and Z, and lasted until the end of the 500-series scope line.

Key Specifications

Bandwidth 50 MHz down to 5 mV/div, 40 MHz at 1 mV/div
Deflection 1 mV/div to 20 V/div, 1−2−5
Common-mode rejection 20,000:1 DC to 100kHz, 10,000:1 up to 1MHz, 200:1 at 20 MHz

Like most Tektronix differential plug-ins, the 1A5 has three modes: VA−VC, VA−VB, and VC−VB.

VC is controlled by a ten-turn potentiometer and can vary from −5 V to +5 V (0.5 V on the 5 V/div to 20 V/div ranges).



Some Parts Used in the 1A5

Part Part Number(s) Class Description Used in
7586 154-0306-00 Vacuum Tube (Triode) Nuvistor triode M 1A1 1A2 1A5 10A2 10A2A 11B1 11B2A 321 321A 3A1 3A1S 3A3 3A5 3A6 3A7 3A8 3A74 3S76 3T77 3T77A 3B5 4S1 4S2 6R1 6R1A 9A1 9A2 82 86 S-311