[ARC5] [BoatAnchors] Receiver Tube Substitution

[Scott Robinson]

On 12/18/16 1:58 PM, Richard Knoppow via BoatAnchors wrote:
>    The BC-779 and other Super Pro receivers used a 6K8 mixer, even
> noisier than the 6SA7. It was about the best of a bad lot at the time.

...and Scott comments:

The real bad apple is the 6A8, in which the AVC pulls the LO like a 
fiend: at 18 MHz, one good wood radio (GE G-106, for those interested) 
pulled 20 kHz due to AVC action. By only changing out the 6A8 for a 6K8, 
which was designed to fix this problem, the pulling was reduced to 1 
kHz, a major improvement.

I have not measured the sensitivity of this receiver, so I don't know if 
it was affected by this change. It does have a 6K7 RF amp.

Peace,

Scott