1A1: Difference between revisions
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There were three distinct versions of 1A1. | There were three distinct versions of 1A1. | ||
* The first version, from 1964 to 1966, has a [[Nuvistor]] front-end, and [[rotary_input_switch|rotary input switches]] that were concentric with the [[BNC]] jacks. The knobs to invert the input channels are concentric with | * The first version, from 1964 to 1966, has a [[Nuvistor]] front-end, and [[rotary_input_switch|rotary input switches]] that were concentric with the [[BNC]] jacks. The knobs to invert the input channels are concentric with the vertical position knobs. | ||
* The second version, from 1966 to ??? has fluted round V/cm knobs, and lever switches. The channel inversion control is an organ-style pull-push knob. | * The second version, from 1966 to ??? has fluted round V/cm knobs, and lever switches. The channel inversion control is an organ-style pull-push knob. | ||
* The third model, from ??? until the end has four-sided V/cm knobs and a FET front-end. | * The third model, from ??? until the end has four-sided V/cm knobs and a FET front-end. | ||
Revision as of 12:27, 12 April 2019
Template:Plugin Sidebar 2 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.
There were three distinct versions of 1A1.
- The first version, from 1964 to 1966, has a Nuvistor front-end, and rotary input switches that were concentric with the BNC jacks. The knobs to invert the input channels are concentric with the vertical position knobs.
- The second version, from 1966 to ??? has fluted round V/cm knobs, and lever switches. The channel inversion control is an organ-style pull-push knob.
- The third model, from ??? until the end has four-sided V/cm knobs and a FET front-end.
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.
Type 1A1 has an External Trigger output for mainframes prior to the 547 that don't support plug-in triggering.
Types 1A1 and 1A2 were introduced together in 1964, the former for high-end use, the latter as an upgrade/replacement for Type CA. Both remained available until the 500-series scope line was discontinued.
The 1A1 is not a perfect superset of the 1A2; it supplies external trigger from channel 1 only.
The 1A1 may have evolved from the Type J, which never went into production.
Specifications
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Links
Pictures
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Early 1A1
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left: Nuvistor right: FET
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left: Nuvistor right: FET
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left: Nuvistor right: FET
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Early 1A1 front end
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Late 1A1 Output Amp
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Early 1A1 Left View
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Latest version of 1A1
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556 with second version 1A1 in left bay and first version 1A1 in right bay.
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Black 1A1
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Latest version 1A1. Photo courtesy of Dan Wilson (Hideaway Studio).
