[ARC5] Quick sensistivity comparison

[Kenneth G. Gordon]

On 13 Jun 2013 at 4:45, J. Forster wrote:

> Ken,
> 
> It might be worth checking for gas in the tubes.

In which? Do you mean the 12SK7s? Or in all?

> I'd suggest running them for several days at nominal filament, nominal
> plate, and biased to conduct about 10-20% of rated plate current to
> allow the getter to clean up anything that has diffused into the tubes
> in the last 70-odd years.

OK. I can do that easily enough.
 
> After that, try the NF test again.

OK. Will do, John. Thanks very much for the suggestions.
 
> YMMV,

Yes! Won't it just! :-)

Ken W7EKB