560-series scopes
The 560 series scopes which were introduced with the 560 and 561 in 1961 were tube scopes that began to introduce some solid state circuitry. They use 2-series or 3-series vertical plug-ins and 2-series or 3-series horizontal plug-ins (exception: 560 only takes 2-series because of weak power supply).
560-series mainframes contain neither delay lines nor amplifier stages, requiring the plug-ins to drive the CRT deflection plates directly, at the disadvantage of needing to calibrate gain or sweep when swapping plug-ins.
560 series scopes
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560 - Basic mainframe (1961)
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561 (1961)
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561A (1962)
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564 - Storage scope (1962)
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565 - dual-beam scope, two plug-ins; built-in trigger, sweep, and horizontal amplifier]] (1963)
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568 - Sampling scope (1967)
560 series plugins
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3A1S - 25 MHz vertical amplifier (1961)
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3A7 - differential amplifier
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3A74 - four-channel vertical plug-in (1963)
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3A9 - 1 MHz differential amplifier (1969)
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3B1S - timebase plug-in (1961)
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3L5 - 1 MHz spectrum analyzer
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3S1 - dual-trace sampling plug-in
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3S3 - sampling plug-in
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3S7 - sampling plug-in (1971)
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3S76 - dual-trace sampling plug-in
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3T7 - sampling timebase and pulser (1971)
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