Mine used to run some of those tubes but I modified it to use some vertical output tubes from the TV repair days. The speech amp is not required to deliver any power to the modulator as the modulator is AB1 and even in the days when I once needed more audio and ran the modulator AB2 the solid state driver did all the work of grid current. The plates of the Bogen output tubes or capacitively coupled to the grids of the four 813s and a center tapped choke feed the bias to the grids
John -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of W5OMR/Geoff Sent: Wednesday, July 26, 2006 9:12 AM To: Discussion of AM Radio Subject: Re: [AMRadio] FS: Bogen DB-15, UTC S-22 Mod TF, Sig Gens, VOMs,Miscellaneous BA Jim Candela wrote: > ----- Original Message ---- > From: Robert Peters <[EMAIL PROTECTED]> > To: Discussion of AM Radio <[email protected]> > Sent: Tuesday, July 25, 2006 7:40:31 PM > Subject: RE: [AMRadio] FS: Bogen DB-15, UTC S-22 Mod TF, Sig Gens, VOMs, Miscellaneous BA > > Hi Don I would like to buy both of the David Bogen... am very familiar > With them...Shipping to Dallas please and can I pay pal you??? > > Bob W1PE > [EMAIL PROTECTED] > > Hey Bob, Those Bogen's will be a neat haul to get going again. One thing though, I thought you were trying to 'lighten the load' a little? :-) > > Regards, and good luck with them Bogen's He did. Bob -thought- he was moving and sold his T-368 (and maybe some other stuff) then changed his mind about moving, *after* the T-3 was gone. For what it's worth, the Bogen CH-120b is the PA system I'm using for the speech-amp on my homebrewed rig. So is John/WA5BXO, but I think he's got a different model. I think his runs (4) 7868's in push-pull parallel, while I've got 8417's. -- Driving your AM Rig without a scope, is like driving your car at night, without headlights. (K4KYV) -- 73 = Best Regards, -Geoff/W5OMR ______________________________________________________________ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:[email protected] AMfone Website: http://www.amfone.net AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb
