[Collins] need cw filter 75S-3

Tue May 31 23:52:21 EDT 2011

That there is. The parts illustration clearly shows an X455KQ200 for 
that 293-0834-00 part number. Not the first manual error found nor the 
last one to be found.

I'm ashamed of the fact that the S-3B/C manual that I edited (about 
October '64 printing date), I didn't check BOM vs parts list vs 
component specifications and schematic voltages vs those parts and the 
voltage/resistance chart. But I made the text more readable and 
understandable compared to the previous edition. Unfortunately the parts 
list, the voltage chart, and the schematic voltages disagree on power 
supply voltages and voltages around the audio output tube.

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

On 5/31/2011 4:39 PM, Glen Zook wrote:
> There is an error in the 75S-3 / 75S-3A manual.  It states that the CW filter is 300 Hz.  However, at least in my 75S-3A and in the 75S-3 that I owned for quite a while, 200 Hz is how the filter is marked.  Also, the Collins advertisements for the 75S-3 and 75S-3A state 200 Hz.
>
> In addition, the filter in my 75S-3A definitely measures 200 Hz, the 300 Hz points are quite a ways down (150 Hz to either side of center).
>
> Glen, K9STH
>
> Website:  http://k9sth.com
>
>
> --- On Tue, 5/31/11, yash at aol.com<yash at aol.com>  wrote:
>
> Iam in need a a cw filter for my 75-S3  ,I beleive its 300cps ,but 200 to 500 cps would also work,I think. I contacted Inrad, they have filters for the 75S-3  B/C with mounting board to snap in. I asked if the filter could be removed from the board and installed into a 75S-3, they said ,didn't think so. If anyone has the proper cw filter ,please get back.  or has another solution for the problem.
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