Paul brings up a good point. Does the frequency jump when tuning, or even when
stopped?
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>
Paul Christensen wrote:
Steve,
No doubt others with more experience will jump in. I've recently pulled more than a half-dozen
PTOs in the last week. The first one takes a bit of time to think through but the info on
WB4HFN's website is excellent. After the first trial, subsequent removal of the whole assembly
with dials can be performed in about 5 minutes. I found that with the PTO sitting on a bench, and
interconnected with RG-174, I could much more accurately analyze problems and performs maintenance
on the units. Removal of the entire PTO is a "must" if you want to inspect the bottom of the
PTO's circuit board. I have an angled dental mirror but it's no substitute for PTO removal.
Anyway, once the PTO is out, you should be able to confidently and easily determine whether the
problem is electrical or mechanical. The Zener helps to stabilize line voltage variations. If
the PTO is "jumping," I would think it may be a mechanical problem -- or perhaps the issue where
the PTO "braid fix" will help. Either way, I would try to pull the PTO and at the same time,
perform maintenance on the bearings, clean the dials, etc as long as it's open and accessible.
Paul, W9AC
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