[ARC5] 12A6 VS ?

[Brian Clarke]

How many 6SR7s do you need? I can help.
73 de Brian, VK2GCE.

----- Original Message ----- 
From: "Kenneth G. Gordon" <kgordon2006 at frontier.com>
To: "ARC-5 List" <arc5 at mailman.qth.net>
Sent: Saturday, April 23, 2011 11:09 AM
Subject: Re: [ARC5] 12A6 VS ?


> On 22 Apr 2011 at 20:02, WA5CAB at cs.com wrote:
>
>> 6K6.  The 6V6 draws too much filament current.  Plus the amp
>> characteristics of the 6K6 are substantially the same as those of the
>> 12A6, and those of the 6V6 aren't close.
>
> Yup. :-)
>
>> The 6SQ7 diodes are the same as those in the 6SR7.  The triode
>> sections, however, are dissimilar.  The 6SR7 is a Medium Mu triode
>> whereas the 6SQ7 is a High Mu.  So the BFO may or may not work.
>
> Usually, a higher mu triode will work "better" as an oscillator than a 
> lower mu
> triode.....usually...however, drift might be worse since plate current 
> might be
> higher, for one thing.
>
>>  But
>> you won't hurt anything trying it.
>
> Agreed.
>
>>  I never did as I didn't know that
>> there was a shortage of 6SR7's.  :-)
>
> Me either! :-)
>
> Ken W7EKB
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