Eddy -
Sorry to hear of your dissatisfaction with Drake performance! :-) We ALL have those
'moments'..........
Drake built better than 100,000 of this basic PTO over the years, so I guess it stands to reason
that there might be a 'dog' or two in there...
I've 'handled' several hundred of those over the last 40+ years, and haven't seen one yet that
couldn't be fixed.
As for the 751A, check back with me when one of those custom ICs dies..... :-)
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>
Eddy Swynar wrote:
Hi Steve,
The frequency of my T-4X PTO jumps upward almost exactly 100-KHz with the cover
removed...
I've tried several different "tricks" in futile efforts at trying to tame mine, including (A)
unplugging the cooling fan that I added to allow everything inside to "heat soak" properly in the
confines of my cool basement (no change), and, (B) "gasketing" the seam at the base of the PTO
shield can with aluminum foil to better shield its contents, and to negate any effect that
expansion/contraction of the shield might have upon the frequency (again, no effect).
I have yet to re-enter the inner sanctum of my PTO here (far too busy with other
stuff), but when I do I plan to completely swab everything down inside it that
moves with isopropyl rubbing alcohol& Q-tips.
The frequency flutter is so very vexing for me that I'm afraid it's fast-removing the gleam in
my eye that I've heretofore reserved for Drake gear---indeed, I'm almost ashamed to admit that
I'm coming to more& more appreciate the sheer joy& pleasure of the reliability&
quality of signal that my old Icom 751A affords me in my portable work, as compared to the
on-going grief given me thus far by the Drake Twins. That's sacrilege, I know, admitting such
on a Drake Reflector, but it is, alas, a sad reality& fact...
~73~ de Eddy VE3CUI - VE3XZ
***********************************************************************************************************************
On 2011-07-18, at 12:13 PM, Steve Wedge wrote:
Logging on from work:
Garey, I thought about that last night and, as luck would have it, I had an
extra good 6HS6, which I swapped. There was no change.
The PTO seems to be a bit better with the cover removed, not the entire unit.
Of course the frequency of the PTO changes considerably with the cover off.
It's got me scratching my head, as there should really be no significant heat
being generated in there...
W1ES
Date: Mon, 18 Jul 2011 10:11:15 -0400
From: Garey Barrell<[email protected]>
To: [email protected]
Subject: Re: [Drakelist] R-4A PTO, Act III
Message-ID:<[email protected]>
Content-Type: text/plain; charset=windows-1252; format=flowed
Steve -
This has been 'one of those' problems! Just a quick question.... I've forgotten
if you said the PTO
was stable outside the radio? IF so have you subbed the PreMixer tube? Possible
load change on the
PTO due to a tube anomaly?
73, Garey - K4OAH
Glen Allen, VA
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