[Boatanchors] Collins KWS-1 puzzle

[James M. Walker]

Darn it, 
I can't find my manual right away but I recall the test switch has two
sets of contacts DPDT, and you may be experiencing a bad switch.
contacts
fail sometimes. Mean while I will look for my manual and try again.
Jim
WB2FCN


Gary Franklin wrote:
> 
> I own a very nice KWS-1, serial number 95. This transmitter was factory
> modified (updated) by one of the owners for 4X250B finals, the ALC circuit
> was changed to use a 6AL5 instead of a 6X4 and a Test Key switch replaced
> the ALC control.
> 
> I have had a recent development. I could tune up in the CW mode with full
> output but in the SSB mode I had no output. After tracing several stages,
> audio amplifiers, balanced modulator, mechanical filter ...etc. and seeing
> no problem I stumbled on to the fact that if I turned the test key switch on
> as you would for tune up in the cw mode, I get microphone audio and SSB
> output. I have never had to turn the test key to the on position in the SSB
> mode to get microphone audio. Puzzles me??? With the test key switch in the
> off position,  I can key the microphone PTT switch and hear the relay kick
> in,  I read 100 ma idling current on the plate but no audio. Turn on the
> test key and bingo ... audio.  Of course the manual I have is an old one and
> the test key change does not show on the schematic... it still shows
> 4X150A's !
> 
> Can anyone give me a hint as to what could have changed or furnish me with a
> schematic of a KWS-1 which has the test key circuit, 4X250's and the 6AL5
> ALC circuits
> 
> Thanks
> Gary  K8BKB
> 
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