3A1

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Tektronix 3A1
10 MHz dual-trace amplifier plug-in
Type 3A1 front view

Compatible with 560-series scopes

Produced from 1962 to 1968

Manuals
Manuals – Specifications – Links – Pictures

The Tektronix 3A1 is a 10 MHz dual-trace amplifier plug-in for 560-series scopes, introduced in 1962. It is compatible with all the scopes in the 560 series, other than the 560 itself, and also with the 129 four bay enclosure and power supply.

Key Specifications

Bandwidth 10 MHz
Risetime 35 ns
Deflection 10 mV/div to 10 V/div, 1−2−5 sequence
Input impedance 1 MΩ // 47 pF

Links

Documents Referencing 3A1

Internals

The input signal passes through compensated attenuators and then into a cathode-follower stage made of two 7586 Nuvistor tubes.

Channel switching in ALTERNATE mode is done using diodes. The output stage that drives the vertical deflection plates of the scope uses a pair of 8233 frame grid power pentode tubes.

Tektronix added a 260 ns delay line to the 3A1 to make the 3A6.

Pictures

Components

Some Parts Used in the 3A1

Part Part Number(s) Class Description Used in
6DJ8 154-0187-00 154-0305-00 Vacuum Tube (Dual Triode) dual triode 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
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