3B2

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Tektronix 3B2
Delaying timebase plug-in
Tektronix 3B2 front

Compatible with 560-series scopes

Produced from 1963 to 1974

Manuals
(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

The Tektronix Type 3B2 is a delaying timebase introduced in 1963 for 560-series scopes except the 560 and 565. It can trigger on signals up to 30 MHz (limited to 500 kHz when used with low frequency vertical plugins like the 3A2).

The 3B2 has a 6CW4 Nuvistor triode cathode-follower buffer amplifier at the trigger input, followed by a differential trigger amplifier made of a pair of PNP transistors, with a 2 mA tunnel diode acting as the actual trigger.

The 3B2 has a 1 MHz crystal oscillator and a counter made of discrete transistors. It generates output pulses that enable it to communicate with a digital unit such as the 6R1 or 6R1A.

The 3B2 uses a 6AL5 tube as the disconnect diode for the sweep.

Key Specifications

Trigger Frequency DC to 30 MHz
Sweep Speeds 1 sec/div to 2 μs/div
Sweep Types Normal and Delayed

Pictures

Components

Some Parts Used in the 3B2

Part Part Number(s) Class Description Used in
12AL5 154-0038-00 Vacuum Tube (Double Diode) high-perveance dual diode 3A2 3B2 545 545A 549 N
1N3714 152-0081-00 Discrete component 2.2 mA, 25 pF germanium tunnel diode 546 547 556 21A 22A 3B1 3B2 3B3 422 491 283
6AL5 154-016 154-0016-00 154-0038-00 Vacuum Tube (Dual Diode) high-perveance dual diode 163 181 190 1M1 310 310A 315 316 317 3B1 3B1S 3B2 3B3 3B5 502 502A 503 511 511A 512 516 517 517A 524 526 535 535A 545 545A 549 551 565 570 581 581A 585 585A C T Telequipment D52 Telequipment D56 Telequipment S52
6BL8 154-0278-00 Vacuum Tube (Triode/Pentode) triode-pentode combo 67 2B67 3B1 3B1S 3B2 3B3 3B4 503 504 506 516 549 561 561A 561S 564 565 567 Telequipment D52 Telequipment D56 Telequipment S31 Telequipment S32 Telequipment S32A Telequipment S51 Telequipment S52
6C4 154-029 154-0029-00 Vacuum Tube (Triode) VHF triode 190 3B2 507 511 511A 517 517A Chemtrix 205
6CW4 154-0323-00 Vacuum Tube (Triode) Nuvistor triode 1A7 3A8 3B2 3S76 6R1 565 S-311
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
TD714 152-0402-00 Discrete component 2.2 mA, 25 pF tunnel diode 1401 1401A 283 R283 3B2 3B3 422 491 546 RM546 547 RM547 556 RM556 SPG11 SPG12
ZZ1000 154-370 154-0370-00 Gas Discharge Tube (Voltage regulator) 81 V voltage reference 129 3B1 3B1S 3B2 3B3 3S76 422 S-311