[Collins] 51J4 audio improvements??

[Wn4i]

I still have a few more  Collins wideband AM broadcasting Mecanical filters
new in box 526-9216 ( 500F94 )  it is a 9.4 Khz wide for AM quality .  Many
sold to fully satisfied 51J4  receivers owners .....giving you the audio
quality
of a 51J1-2-3 - R 388 .
Price $ 85.00 shipped
Yves Wn4i
Yves Pautard
5833 Dryden rd.
West Palm Beach
Florida 33415.....561-689-8819







----- Original Message -----
From: "Paul" <pwende@arrow.com>
To: <collins@mailman.qth.net>
Sent: Tuesday, December 17, 2002 1:17 PM
Subject: [Collins] 51J4 audio improvements??


> Hi Group,
>
> I am the proud new owner of a very nice 51J4 with 1.4, 3 and 6KC filters
> installed. The rig is all original and in very good shape (for it's age).
I
> went through it last night and cleaned all switches and contacts and it is
> now working much better.
>
> I am comparing this radio's audio to my Racal 6790 and yes, it is 40 years
> older than the Racal, but I was expecting a little nicer audio from it. It
> may just be the nature of the 6KC filter as well. I am going to do an
> alignment on it over the holidays but I have a few questions.
>
> How good can the audio from this radio be? I have use GPR-90 and R-390 and
> find they were much more musical. This one may just need a good alignment
> too. Can I pull out a mechanical filter and just feed in to out with a
.01uF
> cap? The xstal filter may be enough for hi fi listening.
>
> Any other improvements I could make to the audio quality? BTW, I will be
> trying to take the audio from the diode load to bypass the final audio
> stages as well.
>
> Look forward to your replies.
>
> Merry Christmas!
>
> Paul
>
> Sponsored by the Collins Radio Association
> http://www.collinsra.com