3A1S: Difference between revisions

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The Tektronix 3A1S is a vertical plug-in for the [[561#561S|561S]].
{{Plugin Sidebar
It is specified to have an input impedance of 47pF in parallel with 1 megohm.
|manufacturer=Tektronix
Input sensitivity in a 561S is from 10mV/div to 10V/div.
|series=561S
Risetime is specified to be 14ns, giving a -3dB frequency of 25MHz.
|type=3A1S
The input signal passes through a compensated attenuator switch and
|summary=25 MHz vertical sampling amplifier plug-in
then into a [[7586]] cathode-follower biased with 2mA plate current.
|image=Tek 3a1s.jpg
|caption=Tektronix 3A1S
|introduced=1961
|discontinued=(?)
|manuals=
* [[Media:070-417.pdf|Tektronix 561S/3A1S/3B1S Manual 070-417]]
}}
The '''Tektronix 3A1S''' is a Vertical Sampling Amplifier Plug-in for the [[561#561S|561S]].


It does not work in other 560-series mainframes.
{{BeginSpecs}}
{{Spec | Deflection      | from 10 mV/Div to 10 V/Div (in a 561S)  }}
{{Spec | Bandwidth      | 25 MHz }}
{{Spec | Rise time      | 14 ns }}
{{Spec | Input impedance | 1 MΩ // 47 pF }}
{{EndSpecs}}
==Internals==
The input signal passes through a compensated attenuator switch and then into a [[7586]] cathode-follower biased with 2 mA plate current.
The gain stages use a mix of transistors and  output stage driving the deflection plates is a transistor/pentode cascode circuit with T-coil loading.
The 3A1S is built in traditional ceramic-strip construction.
==Pictures==
<gallery>
<gallery>
File:Tek 3a1s left.jpg
Tek 3a1s.jpg
File:Tek 3a1s right.jpg
Tek 3a1s left.jpg
File:Tek-561s vert1.png|3A1S input amplifier and switching
Tek 3a1s right.jpg
File:Tek-561s vert2.png|3A1S output amplifier
Tek-561s vert1.png|3A1S input amplifier and switching
Tek-561s vert2.png|3A1S output amplifier
</gallery>
</gallery>
==Components==
{{Parts|3A1S}}
[[Category:560 series plugins]]

Latest revision as of 00:30, 29 November 2023

Tektronix 3A1S
25 MHz vertical sampling amplifier plug-in
Tektronix 3A1S

Compatible with 561S

Produced from 1961 to (?)

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

The Tektronix 3A1S is a Vertical Sampling Amplifier Plug-in for the 561S.

It does not work in other 560-series mainframes.

Key Specifications

Deflection from 10 mV/Div to 10 V/Div (in a 561S)
Bandwidth 25 MHz
Rise time 14 ns
Input impedance 1 MΩ // 47 pF

Internals

The input signal passes through a compensated attenuator switch and then into a 7586 cathode-follower biased with 2 mA plate current.

The gain stages use a mix of transistors and output stage driving the deflection plates is a transistor/pentode cascode circuit with T-coil loading.

The 3A1S is built in traditional ceramic-strip construction.

Pictures

Components

Some Parts Used in the 3A1S

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