[R-390] Z702 Adjustments

[Barry]

With the PTO disconnected, I hooked the signal generator to pin 5 of V701
while watching the output of the PTO on the scope.  There is a definite peak
around 2.9Mc so the resonant point is not far from the center of the PTO
range.  I was thinking if it were resonant somewhere way off from the center
point, then that might be the problem, but no dice.  Will have to keep
looking...

Barry - N4BUQ

> In light of the recent discussions of PTO output, it was mentioned that
> some PTOs have a slug-tuned T701 and others do not (case in point, the
> Cosmos PTOs).
>
> For those of you that do have a slug-tuned T701, where is the adjustment
> seen?  I have looked on the WEB for pictures of various PTOs and all I've
> seen are the adjustment point for C706.  The Y2K manual also only shows
the
> single threaded shaft for C706 with no mention of locating T701 for
> adjustment.  For Z702s with a slug-tuned T701, I expected to see an
> additional hole for the slug but, so far, I've seen none.
>
> Is the slug-tuned T701 similar to the slug-tuned transformes in the IF
deck
> where the hole for the slug adjustment just wasn't included in the can?
>
> It was a busy weekend so I didn't get back to any more testing, but I
still
> plan to replace tubes and "sweep" the output can in hopes of finding
what's
> causing the output to be so low.  According to Rich, his experience with
> all those Cosmos PTOs yielded much better results than what I'm seeing,
but
> he also stated that he's never seen any common failures such as bypass
> caps, etc., so I'm still left wondering what could be wrong here.
>
> Thanks,
>
> Barry - N4BUQ