[AMRadio] Modulator design needed


Dale Smith newday at metrocast.net
Sun Mar 26 16:25:19 EST 2006


There certainly is a driver transformer in a stock apache,the audio driver
is a
12BY7A not a 5763,the 5763 is in the osc,buffer circuit.
dale/ka5who
----- Original Message ----- 
From: <rbethman at comcast.net>
To: <w1eof at hamnutz.com>; "Discussion of AM Radio" <amradio at mailman.qth.net>;
"Discussion of AM Radio" <amradio at mailman.qth.net>
Sent: Sunday, March 26, 2006 12:59 PM
Subject: Re: [AMRadio] Modulator design needed


> Mark,
>
> Take a look at a Heathkit Apache schematic, (TX-1), for ideas.
>
> There is NO driver transformer.  The 5763 driver goes to the Mod
transformer and the EL-34s feed it for audio.
>
> Bob - N0DGN
>
>  -------------- Original message ----------------------
> From: "W1EOF" <w1eof at hamnutz.com>
> >
> > I've been gifted a nice mod transformer so I can build a modulator for
my
> > Johnson 6N2. I don't have a driver transformer so I'm looking for a
design
> > which doesn't need one. I'm sure the schematics are out there, but I
keep
> > finding ones with the driver transformer. Same with all my old radio
books
> > that I've looked at so far. Can someone point me in the direction of a
good
> > design that is online, or one that you can share with me via email?
Thanks!
> >
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