520: Difference between revisions
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[[Phil Crosby]] was the project lead and designed the demodulation circuitry. | [[Phil Crosby]] was the project lead and designed the demodulation circuitry. | ||
[[Ron Olson]] designed the sweep. | [[Ron Olson]] designed the sweep. | ||
The HV oscillator's power transistor is mounted to the rear panel. | |||
Since its collector has 40 kHz with tens of volts peak-to-peak a decision was made to add metal plating to the transistor's Bakelite cover to prevent EMI. | |||
Unexpectedly, the outgassing from the Bakelite caused the metal plating to be blister, which shorted the collector to the case. | |||
When this problem was discovered, the metal plating was removed from the design. In hindsight, the designers didn't believe the plating was necessary in the first place. | |||
{{MissingSpecs}} | {{MissingSpecs}} |
Revision as of 09:29, 2 July 2022
The Tektronix 520 is a vectorscope introduced in 1967. Versions were made for NTSC and for PAL. Phil Crosby was the project lead and designed the demodulation circuitry. Ron Olson designed the sweep.
The HV oscillator's power transistor is mounted to the rear panel. Since its collector has 40 kHz with tens of volts peak-to-peak a decision was made to add metal plating to the transistor's Bakelite cover to prevent EMI. Unexpectedly, the outgassing from the Bakelite caused the metal plating to be blister, which shorted the collector to the case. When this problem was discovered, the metal plating was removed from the design. In hindsight, the designers didn't believe the plating was necessary in the first place.
Key Specifications
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Pictures
520
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520 catalog image
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520 PAL version