[Johnson] Question on a Valiant. IT'S FIXED ! ! ! ! !

Mon, 8 Jul 2002 14:44:05 -0500

Thanks to Tom W4UOC, I checked again and the shunt resistor was .248 Ohms, I
re-soldered it to where it was .202 Ohms and when I fired up the rig the
plate current went down and the output went up (Without resetting anything)
after retuning & dipping the plates to 330 it went right to 150 watts out
just like the book said ?????
Whoda thunk it...

Many thanks to a great list and all the help, the moral to the story is "If
you have a valiant check the shunt (Small piece of wire with black spaghetti
on it) and verify it's .202 Ohms".  Thanks again.

Thanks & 73's Dutch
Please visit my Collins web-site
http://users2.ev1.net/~wb7dyw/
And my new R-390 Page.
http://www.qsl.net/wb7dyw

-----Original Message-----
From: [email protected] [mailto:[email protected]]On
Behalf Of [email protected]
Sent: Monday, July 08, 2002 2:02 PM
To: [email protected]
Cc: [email protected]; [email protected]; [email protected]
Subject: Re: [Johnson] Question on a Valiant.

In a message dated 7/7/2002 10:34:40 PM Eastern Daylight Time,
[email protected]
writes:

> I will take some measurements tomorrow and let you know; I was told that
the
> shunt resistor is the wrong value (I have 5.1 Ohm's now).

There was a write up in Electric Radio magazine a few years ago tha the
shunt
resistor changes.  It is just a short piece of nicrom wire between the
center
tap of the  high voltage transformer and ground.  I had the same problem
with
one of my Valiants and I shortened the nicrom wire by about 1/4 inche to
reduce the resistance to .202 Ohm.  Needless to say your 5 Ohms is much to
high.

Tom Koch - W4UOC
 <A HREF="http://members.aol.com/w4uoc/index.html">W4UOC's Home Page</A>

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