[Collins] Looking for information on the Cunningham C201 and C203 tubes - more

[Dr. Gerald N. Johnson]

Found a 1940 Radio Handbook. It ascribes the 203A to RCA and a very 
similar T-203A to Taylor, doesn't mention Cunningham at all in the tube 
data section.

Some on line history says RCA made all Cunningham tubes after 1925 but 
marked them Cunningham after a 1920 law suit over patents.

I don't know. The 203A by RCA may be the same as the C203 or not. Are 
the manuals for that vintage Collins rigs to be found to describe the 
tube operating conditions?

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


On 9/1/2010 1:44 PM, John Hensley wrote:
>
> Some early Collins transmitters (1930's) used Cunningham tubes.  One unit I have been studying used C201 or C203 tubes which I am wildly guessing weretriodes.  Dunno.
> Can anyone show me a diagram with operating voltages, etc. for these andwhat would have been more modern substitutions?  A pair of the C201 ran100W I believe as compared with the C203 which could do 250 watts.
> All I know.  Any input appreciated.  The Cunningham #10 catalog does notshow them.  The bottom line is I need to figure out the closest RCA equivalentwhich might be available.
> Thank you,
> John W5JV 		 	   		
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