[AMRadio] RE: Receiver update.

[russ dworakowski]

Hey I will trade you a 12SA7 for a good 6K7 metal OK.  Send address.
  Russ Dworakowski   4112 Lake Pleasant Rd.  Erie,  PA  16504.


>From: Brett Gazdzinski <brett.gazdzinski at wcom.com>
>Reply-To: amradio at mailman.qth.net
>To: amradio at mailman.qth.net
>Subject: RE: [AMRadio] RE: Receiver update.
>Date: Fri, 08 Feb 2002 15:00:32 -0500
>
>Russ,
>I don't have a manual for an SP400.
>I think I have everything I need as far as a diagram
>goes.
>I was going to call Antique electronic supply and order
>a 12sa7 when I got paid (2 weeks).
>I have lots of tubes to trade....
>
>I went home for lunch today, and tuned in 40 meters.
>I found a couple of guys on...they may still be on...
>The receiver sounded good, so I dug out an old B+W coil
>assembly, a 3 turn link glued onto a longer piece of coil stock.
>It WAS for a grid drive circuit for something, but I never used it.
>Well, one side of the link to ground, one side of the big coil to
>ground, the hot end of the big coil to the mixer input, the
>hot end of the link to the antenna....signals jump up!
>put the tuning cap across the big coil and tune it...BIG
>jump in signal strength!
>Its very peaky!
>
>Listen a bit, hummmm, sounds GOOD!
>How good?
>I turn on the r390A and put it in the 8Kc position, then switch
>back and forth between the two receivers...
>
>Believe it or not, the homebrew sounds the same!
>
>Conditions were very good, not much interference close to their
>signals, and under these conditions, the homebrew sounds great.
>
>I hook up the DMM to the AGC spot on the detector, and can
>see the voltage moving around, so an S meter should be easy.
>(circuit in Bill Orr handbook)
>
>The tuning rate is very nice, almost like a bandspread, since
>it only covers about 200 KHz.
>The tuning seems very stable and nothing is touchy, although
>lots of stuff is connected with alligator clips!
>
>Next is a lot of cleanup, replacing the alligator clips,
>switching out some caps for new ones I just got,
>re doing the IF transformer sockets and mountings, then on to the
>RF amp, S meter circuit, the buffered IF output (for scope) BFO,
>muting circuit, crystal calibrator, and the front panel work.
>I may get a mechanical filter from the place in electric radio
>if I get the cash...
>
>As it is, things have worked out so much better than I thought
>possible!
>
>I am very excited!
>
>Brett
>N2DTS
>
>
>
> >
> > 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
> >
>
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