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520: Difference between revisions
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The HV oscillator's power transistor is mounted to the rear panel. | 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. | 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 | Unexpectedly, the outgassing from the Bakelite caused the metal plating to 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. | 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. | ||