3A1
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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
Front view
Right side
Right side
Top view
Bottom view
input amplifier schematic
Some Parts Used in the 3A1
| Page | Class | Description | Used in |
|---|---|---|---|
| 7586 | Vacuum Tube (Triode) | Nuvistor triode | M • 1A1 • 1A2 • 1A5 • 10A2 • 10A2A • 11B1 • 11B2A • 321 • 321A • 3A1 • 3A3 • 3A5 • 3A6 • 3A7 • 3A8 • 3A74 • 3S76 • 3S76A • 3T77 • 3T77A • 4S1 • 6R1 • 6R1A • 82 • 86 |
| 8233 | Vacuum Tube (Pentode) | special quality 10 watt pentode | 3A1 • 3A5 • 3A6 • 9A1 • 9A2 |