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7403N: Difference between revisions
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There are two versions, the benchtop 7403N with the CRT above the plug-ins, | There are two versions, the benchtop 7403N with the CRT above the plug-ins, | ||
and a rackmount version, the R7403N, with the CRT to the left of the plug-ins. | and a rackmount version, the R7403N, with the CRT to the left of the plug-ins. | ||
The 7403 was designed from the ground up. | |||
[[Phil Crosby]] led the design. | |||
The design team decided to use a discrete transistor vertical output amplifier rather than a hybrid on beryllium oxide. | |||
The output stage approximated a 3 pole MFED response with an additional real pole closer to the origin. | |||
Since the DC requirement was 3 screen diameters, the gain at the -3db point could be substantially less, | |||
meaning that the load resistor (and output stage dissipation) could be reduced, | |||
allowing the design to meet scan bandwidth and corner shift criteria | |||
with substantially reduced power dissipation. | |||
The 7403N was discontinued around 1975, having been superseded largely by the popular [[7603]] introduced in 1973. | The 7403N was discontinued around 1975, having been superseded largely by the popular [[7603]] introduced in 1973. | ||