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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, and a rackmount version, the R7403N, with the CRT to the left of 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. | ||
The 7403 was designed from the ground up. [[Phil Crosby]] | The 7403 was designed from the ground up. | ||
The design team, led by [[Phil Crosby]], 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. | 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 | Since the DC requirement was 3 screen diameters, the gain at the –3 dB 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The 7403N was discontinued around 1975, having been superseded largely by the popular [[7603]] introduced in 1973. | The 7403N was discontinued around 1975, having been superseded largely by the popular [[7603]] introduced in 1973. | ||