[ARC5] 12 V Power pentode.

[Phillip Carpenter]

According to the TungSol data sheet the 25A6 is a pentode power amplifier not a beam power amplifier like the 12A6.

Phillip



Sent from my iPhone

> On Apr 10, 2016, at 5:21 PM, Leslie Smith <vk2bcu at operamail.com> 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'. 
>  
>  
>    73 de Les Smith
>    vk2bcu at operamail.com
>  
>  
>  
>> On Mon, Apr 11, 2016, at 04:26, Dennis DuValll via ARC5 wrote:
>>  
>>  
>> Ken,
>>  
>> How about the 12A6?
>>  
>> Dennis D.  W7QHO
>> Glendale, CA
>>  
>> ****************
>>  
>>  
>>  
>>  
>>  
>>> On Apr 10, 2016, at 6:03 AM, Phillip Carpenter <carpenterpa at tds.net> wrote:
>>>  
>>> Ken,
>>>  
>>> All I could come up with was the 12BY7 9 pin miniature and the 25A6 octal which has a 25 volt filament.
>>>  
>>> Respectfully,
>>>  
>>> Phillip
>>>  
>>> Sent from my iPhone
>>>  
>>>> On Apr 9, 2016, at 11:47 PM, Kenneth G. Gordon <kgordon2006 at frontier.com> wrote:
>>>>  
>>>> Does anyone here know of a power-pentode, which is 1) not a beam-tube, 2) 
>>>> has a 12.6 V filament, and 3) might have an octal base?
>>>>  
>>>> #3 isn't all that important: I can build an adapter. But #s 1 and 2 are. And #1 
>>>> is of prime importance.
>>>>  
>>>> I can't think of any.
>>>>  
>>>> Anyone?
>>>>  
>>>> Kenneth G. Gordon W7EKB
>>>>  
>>>> "Courage is being scared to death but saddling up anyway."--- John   Wayne
>>>>  
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