3A3

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Tektronix 3A3
dual differential amplifier plug-in
Type 3A3 Front View (SN 4990 up)

Compatible with 560-series scopes

Produced from 1964 to 1972

Manuals
Manuals – Specifications – Links – Pictures

The Tektronix 3A3 is a dual-trace differential amplifier plug-in 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, in 1−2−5 steps
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)

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

Components

Some Parts Used in the 3A3

Part Part Number(s) Class Description Used in
6DJ8 154-0187-00 154-0305-00 Vacuum Tube (Dual Triode) dual triode 067-506 111 132 161 310A 316 317 502 502A 503 504 506 515 516 519 526 529 RM529 533 535 536 543 544 545 545A 545B 546 547 549 555 556 561A 561S 564 565 567 581 581A 585 585A 661 1A4 1S1 60 2A60 63 2A63 67 2B67 3A1 3A1S 3A2 3A3 3A6 3A7 72 3A72 75 3A75 4S2 51 3B1 3B1S 3B2 3B3 3B4 3M1 3S76 3T77 3T77A 9A1 9A2 1121 80 81 82 86 B O W Z Telequipment D56 Telequipment S32A Telequipment D52 S-311 Telequipment TD51 Telequipment S52 Telequipment S51 Telequipment Type A TU-4
7119 154-0340-00 Vacuum Tube (Dual Triode) dual triode 067-506 067-0532-00 191 3A3 3B4 3B5 516 545B 549 661 Chemtrix 205
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