[Boatanchors] Collins KWS-1 puzzle

[Gary Franklin]

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