[Drake] T-4XB--no output

[Al Parker]

Hi Paul,
    Just another suggestion to add to the list, from someone who's been
there:
    Take a look at the resistor feeding the driver plate, I think it's abt
470 ohms, mounted on the final side of a chassis wall from a feedthru, if
my poor memory serves.  After it happened to me I thought, "gee, that's a
good way to run QRP."  It's half watt, guess it can run hot & go high or
open up.
73,
Al, W8UT
New Bern, NC
BoatAnchors appreciated here
http://www.thecompendium.net/radio/
http://www.hammarlund.info

----- Original Message ----- 
From: "Paul Ellis" <homepaul at raccoon.com>
To: <drake at mailman.qth.net>
Sent: Sunday, October 10, 2004 11:53 PM
Subject: [Drake] T-4XB--no output


> Hi, all--
>
> Thanks again to all who helped me troubleshoot my R-4B a few weeks
> back.  Once I got that buttoned together, I started turning my attention
to
> my T-4XB, which isn't working right.   The problem is that there's no
> output from the transmitter on the wattmeter.
>
> I first suspected a bad driver tube and/or finals, so all three tubes
had
> known good tubes substituted.  Voltages check out from both the power
> supply (bias is correctly set at -62V) and the filament fuse is just
fine.
> Voltages seem to check out at each of the pins of  V4, V5 and V6, too.
>
> With the R-4, I can detect a very low level of drive out. Adjusting the
> plate, preselector and load and drive does make a difference--I can hear
a
> weak signal on the receiver, complete with audio, etc., and it's
peakable
> using the transmitter controls.  I'm suspicious of components near and
> around the driver circuit, but need more ideas on where to look and what
to
> look for.
>
> As always, I appreciate all the thoughtful responses I get from all of
> you.  Thanks in advance!
>
> 73,
> Paul
> KA0JQF
>
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