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Questions about tubes and gear that glows. FAQ

RE: Rectifer Tube Choice for easy on the other components.............

Forward drop in 5Y3s is large. You may be hearing the reduction in B+ rail voltage.

If, as the schematic suggests, you're taking the "raw" B+ from pin 8 of the rectifier socket, try a Bendix/Red Bank 6106. It's a variation on the 5Y3 theme that is constructed with a cathode sleeve. Vacuum rectifiers with cathode sleeves exhibit slow B+ rail rise.

BTW, the original use for 6106s was in Nike SAM systems. Bendix/Red Bank is THE epitome of rugged and reliable.

Eli D.

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