Mike McCarthy, W1NR wrote:
> I am in the process of building an 8877 amp and through the course of
> comparing various designs I came across one in Orr's Handbook where the
> input RF was coupled to the filaments with .01 capacitors. This, of
> course, adds an RF choke to the filament leads and is not done in most
> other designs I have looked at.
> I think the article mentions this is to prevent or minimize RF heating
> of the filaments. Is this a valid reason? Are there some other reasons
> to do this?
> I am seriously considering NOT implementing it and going with the Kiss
> approach. Opinions?
I think filament chokes are used with cathode driven amplifiers only. I
have never heard of
using them with grid driven amplifiers. The only alternate that I have ever
heard of is threading
one conductor inside of another and tuning the "coil."
I don't understand any specific connection between the capacitors and RF
choke/s.
--
73 Ron KA4INM - All E-mail sent to this address shall linger in the Google
cloud forever!
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