Actually the 10 watt ratting on the CE 10A/B is 10 watts PEP input. That gives around 5 to 6 watts output PEP for available drive.
73 Gary K4FMX > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:amradio- > [EMAIL PROTECTED] On Behalf Of Bob Bruhns > Sent: Friday, February 17, 2006 11:23 AM > To: Discussion of AM Radio > Subject: Re: [AMRadio] AM Transmitter Advice?? > > 12AX7s have surprised me with their power > capabilities before, but 20 watts output with 30 > watts input is 67% efficiency, and that means that > the 20 watts output is the PEP output of the > 3-12AX7 linear. I think that the 10W rating with > a 6AG7 is PEP as well. > > Bacon, W3WDR > > > ----- Original Message ----- > From: "Jim Candela" <[EMAIL PROTECTED]> > To: "Discussion of AM Radio" > <amradio@mailman.qth.net> > Sent: Friday, February 17, 2006 7:29 AM > Subject: RE: [AMRadio] AM Transmitter Advice?? > > > > > > > > Hi All, > > > > I recently had a conversation with a ham in > San > > Antonio (forgot his call), and he told me that > he > > built a unique linear amplifier for his central > > electronics 10a, and for tubes he chose 3 type > 12AX7 > > in parallel grounded grid. He said he could run > 30 > > watts input (300v @ 100ma) with no problems, and > about > > 20 watts out. I find it odd though that a 10a > can do > > 10 watts with a single 6AG7, and 20 watts is > only a > > 3db boost. > > > > To my way of thinking, a linear amp needs to > boost > > your power at least 6 db (~1 'S' unit) to be > worth the > > trouble. For us AM'ers, going from 100 watts to > 375 > > watts carrier does not meet the 6 db boost > criteria, > > and that explains why a good antenna on a DX-100 > is > > better than a average antenna on a Globe King > 500. > > > > Still, as I once posted last year, a dual 304TL > > grounded grid linear seems to fit the bill as a > 6 db > > 'brick' capable of 400 watts AM carrier output > with > > 100 watts AM input, or said another way it takes > 400 > > watts PEP and boosts it to 1600 watts PEP. There > was > > an old W6SAI construction project about this > (single > > 304tl GG amp), and I recall that the setup in > class C > > could run 1 kw dc input with over 1 kw rf output > > because of the low gain, and massive amount of > > feedthrough power from the exciter that finds > it's way > > to the output. This was a way around the FCC > power > > rules of the day. > > > > Regards, > > Jim > > WD5JKO > > > > --- Donald Chester <[EMAIL PROTECTED]> wrote: > > > > > >Assuming one is going to build a linear, and > so > > > putting aside other issues > > > >such as linear vs plate modulation, why do > you > > > think it makes a difference > > > >what tube is used? Are you referring to > running a > > > linear at greater than > > > >legal limit?. > > > > > > Well, go ahead and try building a legal limit > linear > > > that runs a pair of > > > 807's in the final. > > > > > > > > > __________________________________________________ > _____________ > > > > > > This message was typed using the DVORAK > keyboard > > > layout. Try it - you'll > > > like it. > > > http://www.mwbrooks.com/dvorak/ > > > http://gigliwood.com/abcd/ > > > > > > > > > > > > __________________________________________________ > ____________ > > > AMRadio mailing list > > > Home: > > > > http://mailman.qth.net/mailman/listinfo/amradio > > > Help: http://mailman.qth.net/mmfaq.html > > > Post: mailto:AMRadio@mailman.qth.net > > > AMfone Website: http://www.amfone.net > > > AM List Admin: Brian Sherrod/w5ami, Paul > > > Courson/wa3vjb > > > > > > > > __________________________________________________ > ____________ > > AMRadio mailing list > > Home: > http://mailman.qth.net/mailman/listinfo/amradio > > Help: http://mailman.qth.net/mmfaq.html > > Post: mailto:AMRadio@mailman.qth.net > > AMfone Website: http://www.amfone.net > > AM List Admin: Brian Sherrod/w5ami, Paul > Courson/wa3vjb > > > > ______________________________________________________________ > AMRadio mailing list > Home: http://mailman.qth.net/mailman/listinfo/amradio > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:AMRadio@mailman.qth.net > AMfone Website: http://www.amfone.net > AM List Admin: Brian Sherrod/w5ami, Paul Courson/wa3vjb
