551: Difference between revisions
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Image:551 block.gif|Block diagram | Image:551 block.gif|Block diagram | ||
Image:551 vert.gif|Vertical amplifier | Image:551 vert.gif|Vertical amplifier | ||
Image:Tek 551 trigger.png|trigger schematic | |||
Image:Tek 551 block.png|block diagram | |||
</gallery> | </gallery> | ||
Revision as of 08:51, 8 July 2011
The Tektronix Type 551, introduced in 1960, is a 27MHz dual-beam scope that takes two letter-series and 1-series plug-ins. Unlike the 555, it has only one set of horizontal deflection plates and the trigger and sweep circuitry are built in to the mainframe. Like the 555, the 551 has an external power supply unit. The external power supplies of the 555 and 551 are not interchangeable. The vertical amplifiers of the 545A, 551, and 555 are identical.
A factory modification, MOD 108A, was available for increasing the CRT acceleration voltage. This improved trace visibility at high sweep rates.
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Front view.
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External power supply.
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Left side.
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Right side.
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Top view.
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Block diagram
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Vertical amplifier
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trigger schematic
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block diagram
