[ARC5] 12A6 VS ?

[Kenneth G. Gordon]

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