[R-390] Question

[rkofler at aol.com]

Thank you for all the responses. What I meant was, in the Y2K Manual, 
there seems to be two models of IF sub-chassis, the older unmodified 
model, and the newer MOD 1 sub-chassis. In the drawing of the older 
chassis, C-553 is plainly visible. On the drawing of the newer MOD 1 
chassis, C-553 is not listed. The reason I mentioned the trimmers on 
top of the filters is that the manual mentions that as a way to tell 
which model of chassis it is. If the filters have trimmers on top, it 
is the newer MOD 1 chassis.

Maybe I'm reading the manual wrong.

Roger

-----Original Message-----
From: Barry <n4buq at knology.net>
To: r-390 at mailman.qth.net
Sent: Fri, Apr 22, 2011 10:01 am
Subject: Re: [R-390] Question

  C553 is not one of the trimmers.  It is located underneath the IF 
chassis.

Chuck Rippel used to have a webpage that clearly showed its location 
but I can't seem to find that at the moment.  Perhaps another list 
member can point you to that page.

Barry - N4BUQ

> My R-390A is an EAC 1967 contract. Looking at the Y2K manual, chapter
> 12 page 5, my IF sub-chassis appears to be the MOD 1 with the 
trimmers
> on top of the filters.
>
> My question is: Looking at the drawing I don't see a C-553 listed. 
What
> capacitor am I supposed to change to protect the filters from getting
> zapped by the B+ ?
>
> Thanks
> Roger


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