[AMRadio] FW: Homebrew receiver

[Brett Gazdzinski]

Larry,
I did use the 6BE6 as the mixer, works great!
The IF amps are 6BA6 tubes, the detector is a 6BJ8(triode, twin diode),
the S meter amp is a 12AU7, the LO is a 6C4, and the bfo (455Khz xtal osc)
is a 6BH6.

I had problems with the 6BZ6 tubes I tried to use as IF amps and changed
to the 6BA6 tubes, but likely could have got the 6BZ6 tubes to work
if I wanted to play around with things for a while.

Even though the 6BE6 is supposed to be a noisy mixer, using two separate
grids for antenna input and LO input, the receiver is VERY quiet.

Its a bit hard to get used to, when things are quiet, they are REALLY
quiet, and I think something is wrong, or the antenna fell down.

There is no problem using these tubes on the lower frequencies,
not sure about higher frequencies...

Brett
N2DTS
 
> 
> Brett, 
> 
> The miniature equivalent of the 12SA7 is the 12BE6. Some 
> characteristics
> may differ slightly, but I think it's as close as you'll find.
> 
> -Larry
> 
> Brett Gazdzinski wrote:
> 
> > If its not quiet, maybe I will try to duplicate the design of the
> > first receiver using a 7 or 9 pin tube in place of the 12SA7.
> > 
> > I am sure there is a tube to replace the 12SA7 in a miniature
> > type.
> 
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