[ARC5] 12 V Power pentode.

[Kenneth G. Gordon]

On 11 Apr 2016 at 7:21, Leslie Smith wrote:

> 
>   Hello All,
>   The 1941 RCA handbook (May 1, 1942) lists the 12A6 as a "beam power amplifier"
>   I was surprised to see how many "beam" tubes were used, and how few "pentodes" (as distinct 
> from 'beam' tubes) were used as power amplifiers.  Even the 12AQ5 is a beam tube.
>  
>   I don't know much about 'tubes' or the history of 'tubes' but it seems to me that the 12A6 (or 
> 25A6) was the 'grandfather' of  the beam 'tubes'. 

Actually, there were several beam-tubes "published" before the 12A6. I believe the 6V6 
was quite a ways ahead of the 12A6.

The 12A6 is a very good tube, though.

Ken W7EKB