[Hallicrafters] SX-28A 1st RF tube replacement

[Roy Morgan]

On Apr 3, 2009, at 8:31 PM, Carl wrote:

> Thats the W6SAI 6SB7Y article you may be referencing Roy??

I do not know the article that first (or most notably) introduced the  
change of tube type. I'd be most happy to find a scan of that article.

>  CQ, sometime
> in 61 if I remember. Written for the NC-240D in particular but readily
> adaptable to others. The tube has 1/4 the noise resistance of the
> 6SA7/6K8 and made a noticable improvement above 20M. It morphed into  
> the
> 6BA7 while the 6SA7 became the 6BE6.

There are many "lineages" in the history of tube development.  I  
appreciate hearing about these,,, thanks.

Roy

Roy Morgan
k1lky at earthlink.net
529 Cobb St.
Groton NY, 13073