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

[John Hensley]

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