[ARC5] CW/MCW

[Kenneth G. Gordon]

On 12 Nov 2013 at 8:34, Geoff wrote:

> >>    Other good options were to use pentagrid converters for product
> >>    detectors.
> >
> > Yes. 6BE6 was commonly used for such. I never liked that particular
> > kind of PD though. The 6BE6 is a very noisy mixer and doesn't make a
> > particularly stable BFO either.
> 
> The 6BY6 is a much better choice for low noise and overload
> resistance, and in all cases an external BFO is the best. OTOH for
> general use a PD generated BFO is sufficient when the frequency is low
> enough such as in the 50-80 kc range as with most of the later model
> comm receivers.

Thanks for the info, Carl. I recently bought a sleeve of 6BY6s to experiment 
with.

Ken W7EKB