The Tektronix 3A5 is a 15 MHz "Automatic/Programmable Amplifier" plug-in for 560-series scopes. It can automatically seek and select a suitable deflection factor to display an unknown signal.

Tektronix 3A5
Automatic/programmable amplifier plug-in
Tektronix 3A5

Compatible with 560-series scopes

Produced from 1965 to 1972

(All manuals in PDF format unless noted otherwise)

Range seeking is initiated through a switch on the unit, a button on the P6030 probe, or a signal through the PROGRAM connector (using a 263 programmer).

The 3B5 is a time base with similar features.

Key Specifications

Deflection 1 mV/Div to 50 V/Div , 1−2−5
Bandwidth 15 MHz (50 V/Div to 10 mV/Div), 5 MHz (5 mV/Div to 1 mV/Div)
Seeking circuit frequency range 30 Hz to 20 MHz
Input impedance 1 MΩ // 24 pF


Documents Referencing 3A5



Some Parts Used in the 3A5

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
8233 154-0361-00 Vacuum Tube (Pentode) special quality 10 watt pentode 3A1 3A1S 3A5 3A6 9A1 9A2