[Collins] Re: KWM-2A changeover recovery question, etc

[JOE]

I had a KWM-2 that did this years ago.  The standard fix was to replace the 
two final tubes and it went away.  Being a curious and quite parsimonious 
(aka cheap) Yankee, I proceeded to figure it out.

The finals were actually transmitting a weak signal for a few 
seconds.  This was being caused by reverse voltage on the screen pin #3 of 
one or both tubes.  The screen then acted like a plate and the tube 
conducted.  A diode is series with the screen resistor R148 fixed it, 
cathode towards the screen side.  I surmise that as the tubes aged, this 
became a problem.

Calculating the time I spent figuring this out, it would have been a lot 
cheaper to replace the tubes......

73, Joe, K1ike


At 04:01 AM 1/14/2003 -0500, you wrote:
>First, when I go from tune or transmit mode to receive mode, the radio
>"hangs" for about two seconds or so until full receive is regained.  The
>meter pins abuptly, and then settles down to its natural position.

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