[Amps] caps across rectifier diodes

[Ian White GM3SEK]

Carl wrote:
>
>In the past I have looked at many amps and PS with that setup with the 
>goal of eliminating RF getting to the electrolytics and causing 
>premature failure. Something that Ameritrons and Dentrons have in 
>common. I have not noticed any diode noise but that doesnt mean it 
>wasnt there.
>
>Old technology diodes and mercury vapor rectifiers are well documented 
>as hash producers.
>

Maybe we should also be asking how that hash got into our receivers? Was 
it radiated through space or conducted along wiring - and where was the 
shielding and decoupling to prevent that?

One feature of older electronics was a tendency to "open-plan" layouts 
with very little attention to keeping RF in its proper place. Along with 
that was a lack of attention to keeping RF and noise away from places 
where they don't belong.

Regrettably, tube amplifiers are one of the places where those old ways 
still persist.


-- 

73 from Ian GM3SEK