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In article <715287220snx@black.demon.co.uk> tchannon@black.demon.co.uk (Tim Channon) writes:
>From: tchannon@black.demon.co.uk (Tim Channon)
>Subject: Data 12A6 wanted 
>Date: Mon, 31 Aug 1992 14:49:57 +0000
>>In article <MOTOYAMA.92Aug25101834@harlgw92.harl.hitachi> motoyama@harl.hitachi> (Hiroshi Motoyama) writes:
>>>Can anyone out there access to the data for the tube 12A6? I need the Eb-Ib 
>>>curves for that tube. The 12A6 is a GT, metal, beam pentode for audio power 
>>>amplification, developed possibly in early 40's by RCA. 
>>
>>I tried to e-mail this but it bounced.
>>
>
>I had a bounce as well and on looking at the address, no Japan, so please fix 
>your mailer.
>
>The 12A6 is a 12V heater version of the 6A6? 
>
>Try asking vintage radio societies or radio hams and I expect they will know 
>where to find the data.
>
>A 1945 publication did not know of the 12A6 under RCA numbers, whilst the 6A6 
>in various forms was well covered, and the 25A6 is mentioned. Characteristic 
>stated as equivalent to 6N7.
>No curves though. 
>
>I would be reluctant to put any tightly specified characteristic on tubes, 
>they tend to vary greatly particulary vs. age.
>
>If you are still stuck email me directly.
>
>  TC. 
>    E-mail: tchannon@black.demon.co.uk or tchannon@cix.compulink.co.uk
>                                

6A6 is High-Mu Twin Power Triode, while 12A6 is single Beam Power Pentode. 
You should find the data in 1942 RCA publication.

Peace and Prosperity!
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