3A1: Difference between revisions

Revision as of 18:42, 16 September 2023

Tektronix 3A1
10 MHz Dual trace amplifier plugin Type 3A1 front view Compatible with 560-series scopes Produced from 1962 to 1968 Manuals Tektronix 3A1 Manual 070-343 Tektronix 3A1 Manual 070-0343-01 Tektronix 3A1 Manual (DjVu @ BAMA) Tektronix 3A1 Factory Calibration Procedure, November 1963‎ (All manuals in PDF format unless noted otherwise)

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.

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

Pictures

3A1 Front
3A1 Right
3A1 Right
3A1 Top
3A1 Bottom
3A1 Input Amplifier Schematic

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	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
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

@@ Line 3: / Line 3: @@
 |series=560-series scopes
 |type=3A1
-|summary=Dual trace amplifier plugin
+|summary=10 MHz Dual trace amplifier plugin
 |image=Tek 3a1 front.jpeg
 |caption=Type 3A1 front view
@@ Line 29: / Line 29: @@
 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==
 <gallery>
-a1 front2.jpg |Front view
+a1 front2.jpg |3A1 Front
-a1 right2.jpg | Right side
+a1 right2.jpg |3A1 Right
-a1 right.jpg | Right side
+a1 right.jpg |3A1 Right
-a1 top.jpg | Top view
+a1 top.jpg |3A1 Top
-a1 bottom.jpg | Bottom view
+a1 bottom.jpg |3A1 Bottom
-a1 input amp and switching.png|input amplifier schematic
+a1 input amp and switching.png|3A1 Input Amplifier Schematic
 </gallery>