[ARC5] 6AC7 and 6AB7

[Geoff]

> On 5 Feb 2013 at 20:40, Sandy wrote:
>
>> From what you are describing, it should be a very excellent "VFO" 
>> oscillator
>> then?  Never thought to try one like that!
>> 73,
>> Sandy W5TVW
>
> There were several articles in old QSTs, some of which ended up in old 
> ARRL Hancbooks,
> which detailed VFOs built using 6AC7s.
>
> Ken W7EKB


Even the 6SK7 was a semi popular VFO tube.

Carl