[Johnson] Ranger Problems

[Glen Zook]

Replace all of the paper type capacitors if you
haven't already.  Look for "hidden" ones.

Then tighten all of the screws, nuts, etc., that go
through the chassis.  All of the grounds are made
through these.  If your transmitter has rivits, you
are going to have to use a hammer and punch to tighten
these.  Remove the tubes before hammering.

Tighten the tube sockets by using a large needle and
pushing from the outside of the metal.

Clean the tube sockets with a good cleaner.

Clean the pins on the tubes like by dipping in one of
those sliver dip cleaners that are available at
supermarkets.

I have found that most Rangers do run a bit higher
than other types of transmitters where audio gain is
concerned.

Check the lower audio stage tubes.

Clean the mode switch, band switch, etc.

If those things don't fix the problem then you are
going to have to do some troubleshooting.

Glen, K9STH


--- dreamlobo <dreamlobo at cableone.net> wrote:

There remains two problems that I have spent some time
on trying to resolve with no success. When the radio
is first keyed up, the modulator resting current moves
quickly to about half of what the resting value should
be, and then, with in a second, moves up to about 65
ma which is about what it should be. The audio gain
control must be turn up virtually all the way to fully
modulate the transmitter and then as you talk the
radio slowly begins to over modulate requiring a
reduction in audio gain down finally to about where it
should be with a D104. I have checked all tubes and
resistor values as well as voltage values and simply
can not find anything wrong.









Glen, K9STH

Web sites

http://home.comcast.net/~k9sth
http://home.comcast.net/~zcomco

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