|[AMRadio] Modulator design needed|
manualman at juno.com
Sun Mar 26 13:33:45 EST 2006
12BY7 drives the driver transformer which, in turn drives the EL-34's.
Build a phase inverter, like many of the Hi-Fi amps that don't use a
driver transformer to drive the EL-34's.
On Sun, 26 Mar 2006 13:19:06 -0500 "Mike Sawyer" <w3slk at uplink.net>
> I suggest you look at the schematics again. The output of the
> 5763 goes
> no where near the modulator. I don't have the schematics in front
> of me but
> I have done some extensive work in the audio section.
> ----- 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
> Take a look at a Heathkit Apache schematic, (TX-1), for ideas.
> There is NO driver transformer. The 5763 driver goes to the Mod
> 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
> > Thanks!
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