[Collins] 75A4 CONVERSION
Carl
km1h at jeremy.mv.com
Sat Jan 24 18:12:27 EST 2009
The 6GM6 only needs enough gain to overcome the mixer noise and if a
Pullen is configured properly it shouldnt overload except under extreme
conditions. A straight dual triode mixer isnt as robust.
With the plate and screen at 125V, and plenty of AVC action there
shouldnt be a problem.
I modified my A4 with the 6GM6 and 7360's in both mixers in 1965 along
with cascaded filters and AVC changes and today it still outperforms
anything I own for pure battle condition digability on 80/160 CW DX.
If I get a K3 as planned that just may change and force me to install
6ES8 Pullens.
Carl
KM1H
----- Original Message -----
From: "Mr. and Mrs. Magoo" <magoo at isp.ca>
To: <collins at mailman.qth.net>
Sent: Saturday, January 24, 2009 7:46 AM
Subject: [Collins] 75A4 CONVERSION
>I really like the 6ES8 mixer/6GM6 front end conversion I did on my
>75A4.
> The only problem I encountered is that the RF gain is now
> significantly
> higher resulting in overload on strong SSB signals. I can live with
> this by
> reducing the RF gain control but somewhere down the line I will tackle
> this
> problem. Apart from this, my 75A4 is an excellent performer in
> digging weak
> ones out of the crud on CW and is sure a much more enjoyable receiver
> to
> operate than the stock version.
>
> Bill, VE3NH
>
> ______________________________________________________________
> Collins mailing list
> Home: http://mailman.qth.net/mailman/listinfo/collins
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:Collins at mailman.qth.net
>
>
More information about the Collins
mailing list