[ARC5] (Fwd) Re: R-10 in the receivers.

[Kenneth G. Gordon]

Gents:

I BCCed the reply from Neil which included his thoughts on the purpose of 
R-10 to my friend, Roger Kuchera K1TG, who is the person I mentioned who 
is attempting to restore to working condition his first "ARC-5" receiver, a 
badly mauled BC-453.

He did some digging in one of the SCR-274N manuals I sent him and came 
up with this below....which I should have read before I asked the question:

------- Forwarded message follows -------
Date sent:	Wed, 24 Sep 2014 08:41:39 -0700
Subject:	Re: [ARC5] R-10 in the receivers.

Gentlemen,
     I don't know if this will get back to both of you or just Ken, but here goes:

     According to the manual RADIO SET SCR-274-N, page 24, paragraph 
14-13. The 50K variable resistor work in conjunction with R10 as follows:  

     "In the minimum gain position of R-25 (50,000 ohms), there is a 
difference of potential of approximately 30 volts even though the cathode 
current is negligible. From this, it may be seen that R-10 acts to make the 
control voltage developed across R-25 less dependent upon the cathode 
current of the tubes being controlled."  

     This may lend due credence to what was said in the email from Neil and 
Ken.  

      Thank you both for the information.

CUL, Roger/K1TG

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As I tell folks when necessary, "Read the "fine" manual" ;-)

Ken W7EKB