[Collins] problems with kws-1 tx audio

[Dr. Gerald N. Johnson]

After assembling a few pages of schematic from a .pdf file so I can 
trace circuits, it looks to me as if the ground connection to the audio 
output tube cathode V102A (pin3) that's supposed to be through the 
common wiper of pin 1 of S101C (mode switch) front is missing. That's 
supposed to be grounding out VOX circuits in cals and CW. With that 
common wiper circuit open only the test key is grounding those and as a 
side effect ground the cathode of that audio output tube. The circuits 
are mingled on that switch wafer so that it unhooks the ground to that 
audio tube for CW and ST BY modes.

73, Jerry, K0CQ, Technical Adviser to the Collins Radio Association.

On 10/23/2010 11:10 AM, Fern wrote:
>       I'm in the process of restoring a late model kws-1 which has the test
> key that sat idle for many years. I got everything working  with fresh
> alignment on all bands except for the following: If I key the ptt on the
> mic, the amp goes into transmit ok with 100ma of idling current except I do
> NOT have any transmit audio but if I activate the "test key" then there is
> transmit audio. So before I pull all my hair out can someone please guide me
> in the right direction. I've already replaced V103 12AT7 and made sure that
> K101 ptt relay works and cleaned all contacts of same without any
> improvement.
>      73 from Fern
>
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