[Milsurplus] [MRCA] The Navy MAK project

[Kenneth G. Gordon]

On 18 Jul 2019 at 12:15, Robert Downs via Milsurplus wrote:

>     Have you tried an FT-243 holder on a frequency in the vicinity to see whether or not it will work 
>     with either the 12A6 or the 12K8?  I have a few 3885 KC and 4340 KC pairs in the FT-243 holders.  
>     They are actually for the BC-611.
>      
>     Also, it would be more nearly correct to say that the 12A6 is a 12V equivalent to the 6K6 than the 
>     6V6.  The 6V6 has a heavier heater than the 6K6.

What Robert said.

Personally, I've never understood why the 6V6 or 6L6 were ever used as crystal oscillators: 
their "beam power" construction totally eliminates any POSSIBLE ECO action, and they are 
actually hard on crystals.

Although most tube manuals list the 12A6 as a "Beam Power Pentode", I think it is actually 
simply a "Power Pentode" exactly like the 6K6, which is ALSO shown as a "Power Pentode" 
and not a beam tube.

As such, they both should make better oscillators than the 6V6.

Ken W7EKB