[AMRadio] FW: Homebrew receiver

[Brett Gazdzinski]

Yes, and the Scott had push pull 25L6 (6L6 with 25 volt filaments), and
a circuit with no driver transformer.

The Scott has a built in speaker in the front panel, and replacing it
with a modern speaker did wonders, since the radio cabinet
is totally sealed, not even a vent hole.
The cabinet acts like a speaker cabinet, and sounds very good.
You can also hook up a big external speaker for even better sound.
The bandwidth switch has cw, sharp, medium, broad, and hifi!
The hifi position is very wide!

My SX17 has push pull 6L6 tubes, and something like 19 watts out!
It also sounds wonderful.

Great receivers except for the frequency readout.
These days, you can add a digital frequency display, sits in a little
cabinet
on top of the receiver, and all you need to do is get the pickup
wire close to the LO tube...no actual connections to the receiver.

While both receivers have very usable filters, they are not quite
up to modern standards, and a strong QSO 5 Kc away gets in, but you could
add the kiwi filters since they run 455Khz IF frequencies.
You don't NEED to add the filters, but they would help at times.

Along with the SX28, some of the best AM receivers ever made!

I saw an SX28 at the fest a week ago, $200.00 asking price
with a missing S meter and some rust....


I tend to think many people who have gotten into AM lately
may have never heard a good quality AM signal on such a receiver.
On 40 meters, like last Saturday, conditions were fantastic,
NO static or noise at all, empty band, good conditions.
I thought the home brew receiver crapped out, as I could hear
NOTHING but a slight hiss with the rf gain all the way up, and the
volume loud.
I actually went out and checked that the antenna was still up!
I then did some testing, running the 32V3,s a bit, and the swr
looked ok, so the antenna was ok.
Spotting the transmitter came through on the receiver ok, so
that was ok!

Someone came back to my testing, and we had a short QSO, but
conditions were SO good, any receiver would do fine.

You get someone with a quality transmitter at the other end,
and the audio sounds better than talking to someone in person.

This is somewhat ruined on a modern rig, with its distortion and
hash.
The IC756 pro had quite a load of hash under the same conditions
Saturday, with the RF amps off.

While it sounds MUCH better than ssb, many people don't know
how good AM can actually sound on a good tube receiver.

Brett
N2DTS


> -----Original Message-----
> From: amradio-admin at mailman.qth.net
> [mailto:amradio-admin at mailman.qth.net]On Behalf Of patrick jankowiak
> Sent: Sunday, October 19, 2003 1:17 AM
> To: amradio at mailman.qth.net
> Subject: RE: [AMRadio] FW: Homebrew receiver
>
>
> The Hallicrafters SX-28 has the finest AM sound I have ever heard in a
> commercial or military general coverage receiver. 8 watts from PP
> 6v6's and that bass boost switch! OOHH!!! Rockin' to the oldies!
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