Re: [drakelist] TR-4 Relay question

[Don and Diana Cunningham]

"Don and Diana Cunningham" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Chuck,
Opinions are not really worth much, but mine is that you would spend your 
money better by having a good set of spare tubes to just substitute in like 
Garey suggests.  Much cheaper than a decent tester, and will serve you much 
better.  Many a tube that checked good in a tester turned out to be a 
bummer!!  Just my .02 worth though, worth what you paid for it, hi hi.
73,
Don, WB5HAK
----- Original Message ----- 
From: "Chuck Wyatt" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>; "'Drakelist'" <drakelist@www.zerobeat.net>
Sent: Monday, May 09, 2005 1:11 PM
Subject: RE: [drakelist] TR-4 Relay question


"Chuck Wyatt" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Okay, will do, no replacing of all the tubes.  I am looking on eBay for
a decent tube-checker, though!
73,
-Chuck
-----Original Message-----
From: Garey Barrell [mailto:[EMAIL PROTECTED]
Sent: Monday, May 09, 2005 12:14 PM
To: [EMAIL PROTECTED]; Drakelist
Subject: Re: [drakelist] TR-4 Relay question
Chuck -
I would NOT replace all tubes with new ones!!!   This is a sure-fire way
to get into a lot of trouble.  Consider the possibility that  one or
_TWO_  of the new tubes are either defective or sub-par in some way.
Right away you have  _TWO_  entirely different problems to troubleshoot.
There's nothing wrong with having a set of tubes on hand however.   Then
if you have a problem, you can replace the "most likely" tube and see if
there is any change.  If you still have the problem, replace the
original tube and try the "next most likely".  If you still have the
problem, you then know that it's NOT a tube, and can proceed to
troubleshoot until you find the "real" problem.   When you have a
working unit, check your spare tubes, again, one at a time, to verify
that they work as expected.  In this case don't worry about minor
changes that might be corrected by alignment, etc., but just verify that
the unit still "works" with the spare tube in place.   Then store those
tubes away and you have a definitive trouble-shooting tool.
The carrier shift relay Drake used became unavailable near the end of
production of the TR-4s.   They made a small PC board that would accept
another PC mount relay and had terminals to allow replacement of the
original relay.
73, Garey - K4OAH
Atlanta
Drake C-Line Service Manual
<http://hr99.home.mindspring.com/R-4C_Servicez/>

Chuck Wyatt wrote:
Thanks Garey, I'm definitely going to try this, especially as Gary
(Poland) indicates the original replacement relay is pretty difficult
to find.  Though I suppose I could substitute something from R/S
perhaps
with a 12 VDC coil.   I'm supposing that this relay has nothing to do
with carrier behavior (no carrier about 80% of the time when I throw
the tune switch).  As when I tap it down, the frequency on SSB receive
shifts back to normal, but it doesn't seem to impact the tuning issue.
Since I bought it only about a month ago, it probably makes sense to
buy a whole new set of tubes for the thing just to discount gassey
tubes as having an impact.
-Chuck



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