500-series scopes
The 500 series of oscilloscopes from Tektronix includes:
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531 - 10 MHz dual timebase scope,1954
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RM31A - rack-mount 531
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532 - 5 MHz scope, 1955
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RM32 - rack-mount 532
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533 - 15 MHz scope, 1958
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535 - 10 MHz dual timebase scope, 1954
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RM35A - Rack-mount 535
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536 - X-Y scope (no trigger/sweep), 1957
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541 - 30 MHz single timebase scope, 1955
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543 - 30 MHz single timebase scope, 1958
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544 - 50 MHz single timebase scope, 1964
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RM544 - Rack-mount 544
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545 - 30 MHz dual timebase scope, 1955
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RM545 - Rack-mount 545
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546 - 50 MHz dual timebase scope
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RM546 - rack-mount 546
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547 - 50 MHz dual timebase, alternate sweep scope
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549 - 30 MHz storage scope, 1966
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551 - 27 MHz dual-beam, single timebase scope, 1958
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555 - 30 MHz dual-beam, dual timebase scope, 1959
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556 - 50 MHz dual-beam, dual timebase scope
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945 - 30 MHz dual timebase ruggidized scope
These scopes take letter-series and 1-series plug-ins.