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The Tektronix Type 3A1 is a dual-trace amplifier plug-in introduced in 1963 for 560-series
{{Plugin Sidebar
oscilloscopes.  Bandwidth is 10MHz (35 nanosecond risetime).  The input impedance is 47pF.
|manufacturer=Tektronix
Deflection factor ranges from 10mV/div to 10V/divThe input signal passes through
|series=560-series scopes
compensated attenuators and then into a cathode-follower stage made of two 7586 Nuvistor
|type=3A1
tubes.  Channel switching in ALTERNATE mode is done using diodes. The output stage that
|summary=Dual trace amplifier plugin
drives the vertical deflection plates of the scope uses a pair of 8233 frame grid power
|image=3a1 front2.jpg
pentode tubes.
|caption=Type 3A1 front view
|introduced=1962
|discontinued=1968
|manuals=
* [[Media:070-343.pdf|Tektronix 3A1 Manual 070-343]]
* [[Media:070-0343-01.pdf|Tektronix 3A1 Manual 070-0343-01]]
* [https://bama.edebris.com/download/tek/3a1/3a1.djvu Tektronix 3A1 Manual] (DjVu @ BAMA)
* [[Media:Tek 3a1 fcp nov 1963.pdf|Tektronix 3A1 Factory Calibration Procedure, November 1963‎]]
}}
The '''Tektronix Type 3A1''' is a 10 MHz dual-trace amplifier plug-in for [[560-series scopes]], [[introduced in 1962]].
 
{{BeginSpecs}}
{{Spec | Bandwidth       | 10 MHz }}
{{Spec | Risetime        | 35 ns }}
{{Spec | Deflection     | 10 mV/div to 10 V/div, 1−2−5 sequence}}
{{Spec | Input impedance | 1 MΩ // 47 pF }}
{{EndSpecs}}
 
==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.
 
==Pictures==


<gallery>
<gallery>
Image:3a1 front2.jpg
3a1 front2.jpg |Front view
Image:3a1 right2.jpg
3a1 right2.jpg | Right side
Image:3a1 right.jpg
3a1 right.jpg | Right side
Image:3a1 top.jpg
3a1 top.jpg | Top view
Image:3a1 bottom.jpg
3a1 bottom.jpg | Bottom view
3a1 input amp and switching.png|input amplifier schematic
</gallery>
</gallery>
{{Parts|3A1}}
[[Category:560 series plugins]]

Revision as of 13:09, 10 July 2022

Tektronix 3A1
Dual trace amplifier plugin
Type 3A1 front view

Compatible with 560-series scopes

Produced from 1962 to 1968

Manuals
Manuals – Specifications – Links – Pictures

The Tektronix Type 3A1 is a 10 MHz dual-trace amplifier plug-in for 560-series scopes, introduced in 1962.

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

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.

Pictures


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