..ok don,then what if went with 4 572b's instead? they have a higher pd i believe..tim..sk..
--- Jim candela <[EMAIL PROTECTED]> wrote: > Don, > > So your saying that 4 X 811's at maximum ratings > in AM Linear mode are > nearly equivalent to 3 6146's class C plate > modulated, i.e. a Johnson > Valiant? :-) > Years ago I bought a book from an ad in the old AM > Press Exchange about AM, > and there was a detailed explanation of class C > plate modulated versus AM > linear operation with the same tubes, and it clearly > showed the differences. > I need to go find that book again... > > Jim > > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of > Donald Chester > Sent: Friday, September 30, 2005 1:58 PM > To: [email protected] > Subject: Re: [AMRadio] GG 813 Linear in GE Ham News > > > > > >.hey don,what are your thoughts of am transmission > >with 4 811s?..i'm looking to get more output on 160 > >am.. > > In linear service, the maximum carrier output would > be half the plate > dissipation. The pd of the 811A is 65 watts. So > for a quad, the maxumum > safe carrier output would be 130 watts. > > In grounded grid service, some of drive power will > feed through, so you > might add 10% to that, bringing the carrier output > power to 143 watts give > or take a few. > > With the pair of 813's you would add some > feedthrough power to the 125 > watts. I would say more like 12.5 watts, to bring > the total to 137.5 watts. > > Most g-g linears take about 10% of the output power > to drive them. > > Don K4KYV > > > ______________________________________________________________ > 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 > -- > No virus found in this incoming message. > Checked by AVG Anti-Virus. > Version: 7.0.344 / Virus Database: 267.11.9/115 - > Release Date: 9/29/2005 > > -- > No virus found in this outgoing message. > Checked by AVG Anti-Virus. > Version: 7.0.344 / Virus Database: 267.11.9/115 - > Release Date: 9/29/2005 > > ______________________________________________________________ > 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 > __________________________________ Yahoo! Mail - PC Magazine Editors' Choice 2005 http://mail.yahoo.com
