[ARC5] Way OT -- SX-28

[Richard Knoppow]

    I think contact bias is the reason given. While this trick 
was very widely practiced its difficult to find anything about it 
in the technical literature. Hallicrafters did mention the 
resistor in their service bulletin about the noise limiter but 
didn't give a reason.

On 8/6/2021 8:18 PM, Hubert Miller wrote:
>> The lowered filament voltage was common on both diode detectors and especially diodes used as series noise clippers.
> The idea was to reduce hum from the electron cloud of the cathode (I am drawing blanks today, there is a proper name for this effect).
>
> Is this the "space charge", which is the same phenomenon which makes "contact bias" possible in such tubes as 6AV6 ?
> -Hue Miller
>
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-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL