[Collins] Looking for information on the Cunningham C201 and C203tubes

[Carl]

The C stands for Collins, not Cunningham although Collins did not make them.

Some were made by Amperex and relabled standard tubes such as the HF-100, 
HF-125, HF-150, HF-200, 211H.

I dont have specific data on the ones you mentioned but there should be a 
relatively common replacement from Amperex, United Electronics or other 
small speciality companies.

Collins did this to not get around patent issues but control replacements 
and laid good smoke screens in their ads and literature.. Motorola did this 
very well in later years.

Do you have specific transmitter models?

Carl


----- Original Message ----- 
From: "John Hensley" <w5jv at hotmail.com>
To: <collins at mailman.qth.net>
Sent: Wednesday, September 01, 2010 2:44 PM
Subject: [Collins] Looking for information on the Cunningham C201 and 
C203tubes


>
> 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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