[AMRadio] RE: Receiver update.

[WN3B]

Hey Russ, I beat you this time. I already mailed a 12SA7 out to Brett
earlier today.
Oops, Brett may have found one I don't know I just figured I would mail him
one.

Brett, you got a tube coming................73, Mike / WN3B


----- Original Message -----
From: "russ dworakowski" <wb3fau at hotmail.com>
To: <amradio at mailman.qth.net>
Sent: Friday, February 08, 2002 2:17 PM
Subject: Re: [AMRadio] RE: Receiver update.


> Hey  Brett, consider looking at  a SP400 for  circuit ideas.  Did you
find
> a  12SA7?  If  not,  I  will send you  one,  email me.  Russ
>
>
> >From: Brett Gazdzinski <brett.gazdzinski at wcom.com>
> >Reply-To: amradio at mailman.qth.net
> >To: amradio at mailman.qth.net
> >Subject: [AMRadio] RE: Receiver update.
> >Date: Tue, 05 Feb 2002 22:24:03 -0500
> >
> >Hello all AM'ers.
> >My home brew receiver is coming along.
> >I got the LO working well, the mixer works also,
> >that surprised me!
> >I built 3 stages of IF amplification, and did experiments
> >with circuit values and component types.
> >I had some sort of oscillation at times, caused by excessive
> >plate voltage on the tubes and un-grounded IF transformer cans.
> >
> >I also tried the mechanical filter I have, and it seems to work
> >well but is somewhat lossy...need to experiment a bit with that.
> >
> >A good spectrum analyzer has been incredibly helpful, and
> >I am lucky to have a very good one through work.
> >It enables me to see things, measure things, and makes a great
> >frequency counter as well.
> >
> >I am working on the detector now, and may be able to actually
> >listen to something soon.
> >The RF amp is waiting for coil stock, so that will be a while,
> >but the receiver picks up the signal generator
> >turned all the way down and not hooked up to the receiver.
> >
> >I still have the agc, S meter, manual IF gain control,
> >manual RF gain control, muting circuits, and the rf amp
> >tuned circuits to do, but I am surprised its coming along
> >as well as it is.
> >
> >Anyone got any good octal TUBE type detector circuits?
> >I have one off the web, low distortion am detector,
> >but it does not list the tube types.
> >Its a diode (tube) followed by a triode amp, output
> >taken off the cathode and the rf filtered out.
> >
> >Tonight, my Scott SLRM blew out its mixer tube filament
> >while listening to 80 meters.
> >Its been a long time since I blew a tube out in anything.
> >
> >Figures its one I don't have a spare for (12SA7)!
> >
> >
> >Brett
> >N2DTS
> >
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