[R-390] No Peak on T701

[Barry]

By the way, FC7 (changing R702 from 56k to 220k and thereby reducing the
output of the PTO voltage) has not been done on this PTO.

Barry - N4BUQ

----- Original Message -----
From: "Barry" <n4buq at knology.net>
To: "R-390A" <r-390 at mailman.qth.net>
Sent: Saturday, April 29, 2006 10:22 PM
Subject: [R-390] No Peak on T701


> I've been doing some more tweaking on one of my R390As.  T701 (output
> transformer from the PTO) will not peak.  I'm getting slightly less then
2V
> peak to peak no matter how I adjust the slug.  Anyone ever seen this
> behavior?  If so, any ideas what's wrong?
>
> I've done some resistance checking on V701 and nothing is all that far
off.
> Since the slug tunes the plate tank, I'm wondering if the problem might be
> with C706.  It's supposed to be adjustable, but how?  Reading the Y2K
> manual, it states C706 is a variable glass dielectric cap.  Not sure what
> that is, but with the PTO out of the radio and the cover off of Z702, I
see
> a clear cylinder in which the slug moves.  Is that C706?
>
> Thanks for any help or advice on this.
>
> Barry - N4BUQ
>
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