3A1
The Tektronix Type 3A1 is a 10 MHz dual-trace amplifier plug-in for 560-series scopes, introduced in 1962. It is compatible with any scopes in the 560 series other than the 560.
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
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3A1 Front
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3A1 Right
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3A1 Right
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3A1 Top
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3A1 Bottom
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3A1 Input Amplifier Schematic
