[R-390] Speaker

[Paul H. Anderson]

I found that the LS-166 sounds pretty awful (at least mine do).  I
modified a used LS-166 by removing the vehicle/something rotary switch,
putting a switching quarter inch plug in its place.  I wired it so that I
could plug in external 8 ohm speakers (which shuts off the internal
speaker), or remove the plug and use the LS-166 as-is.  Seemed to work
pretty well.

But I prefer the diode load approach most, since I just ran the output
over to a cheap powered speaker from a computer.  A long time ago, someone
posted a simple DC isolation circuit for it that I made.  I don't remember
the values of the resistor and capacitor.

Paul

On Wed, 22 Sep 2004, Bruce Stewart wrote:

> Hi All,
> I have always used a LS-166/U speaker with my R-390's.  You would just need
> to change the cable or U-77 connector.
> Bruce
>
>
> ----- Original Message -----
> From: "mikea" <mikea at mikea.ath.cx>
> To: "Charles B" <ka4prf at us-it.net>
> Cc: <r-390 at mailman.qth.net>
> Sent: Wednesday, September 22, 2004 4:54 PM
> Subject: Re: [R-390] Speaker
>
>
> > On Wed, Sep 22, 2004 at 08:53:38PM +0100, Charles B wrote:
> > > Hi all,
> > >
> > > where can I find a 600 ohm speaker?
> >
> > They're not very common, but 600-to-8 ohm transformers are; I use
> > 'em on all my military radios with 600-ohm speaker outputs.
> >
> > --
> > Mike Andrews