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The '''Tektronix Type 1A1''' plug-in for the [[500-series scopes]] has two channels and a -3 dB point of 50 MHz at 50 mV/Div, 28 MHz at 5 mV/Div, and 2 Hz to 15 MHz at 500 μV/Div when channels 1 and 2 are cascaded. | The '''Tektronix Type 1A1''' plug-in for the [[500-series scopes]] has two channels and a -3 dB point of 50 MHz at 50 mV/Div, 28 MHz at 5 mV/Div, and 2 Hz to 15 MHz at 500 μV/Div when channels 1 and 2 are cascaded. | ||
Early production used a [[Nuvistor]] front-end, and [[rotary_input_switch|rotary input switches]] that were concentric | Early production used a [[Nuvistor]] front-end, | ||
with the [[BNC]] jacks, while later units have FETs and lever switches. Type 1A1 uses the "ALT SWEEP SLAVE PULSE" signal that is sent by scopes on pin 7 of the plug-in connector. In a Type [[547]] mainframe, this signal allows channel 1 to be displayed using the "A" timebase and channel 2 using the "B" timebase. | and [[rotary_input_switch|rotary input switches]] that were concentric | ||
This is useful, for example, to view the IF and AF of a radio receiver at the same time. | with the [[BNC]] jacks, while later units have FETs and lever switches. | ||
Type 1A1 uses the "ALT SWEEP SLAVE PULSE" signal that is sent by scopes on pin 7 of the plug-in connector. | |||
In a Type [[547]] mainframe, | |||
this signal allows channel 1 to be displayed using the "A" timebase | |||
and channel 2 using the "B" timebase. | |||
This is useful, for example, to view the IF and AF of a radio receiver at the same time. | |||
Even after the front-end transitioned from Nuvistors to FETs, | |||
the output amplifier continued to use Nuvistors. | |||
Types 1A1 and [[1A2]] were [[introduced in 1964|introduced together in 1964]], | Types 1A1 and [[1A2]] were [[introduced in 1964|introduced together in 1964]], | ||