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.
Pete, wa2cwa On Sun, 26 Mar 2006 13:19:06 -0500 "Mike Sawyer" <[EMAIL PROTECTED]> writes: > Bob, > 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. > Mod-U-Lator, > Mike(y) > W3SLK > ----- Original Message ----- > From: <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]>; "Discussion of AM Radio" > <[email protected]>; > "Discussion of AM Radio" <[email protected]> > 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" <[EMAIL PROTECTED]> > > > > 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!
