[ARC5] Receiver Filter Adaptor- From Pillar, Back to Post

David Stinson arc5 at ix.netcom.com
Thu Feb 18 04:42:24 EST 2016


----- Original Message ----- 
From: "AKLDGUY ." <neilb0627 at gmail.com>
To: "David Stinson" <arc5 at ix.netcom.com>
Subject: Re: [ARC5] Receiver Filter Adaptor- From Pillar, Back to 
Post


> Oh dear.
> The zener shouldn't be anywhere near a signal path.
> Take the zener out of there and put it on the B+ side
> of the IFT before the decoupling cap.
>
> 73 de Neil ZL1ANM
I understand and would normally agree.
But that is Forbidden.  Premise is that one must be able to 
return the 12SK7 to the socket and operate as original.  Anything 
that prevents that (like the resulting 20 volts on the 12SK7 
plate) is a "show stopper."  Seems to work OK where it is.  The 
zener is constantly in conduction and the RF rides on the 
current.  Diodes in conduction in RF paths which switch TX/RX are 
common in modern rigs.



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