I based my 813 rig on the article you talk about. I did not do separate output decks but wound up with a continuous coverage 1.5 to 30 mc setup. A lot of the electronics (control, protection) I got from that design though.
That article was very interesting, the decks wind up being quite small. My modulator deck came right out of a QST article, pair of 4cx250b's with minor changes. Brett N2DTS > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of W1EOF > Sent: Monday, January 30, 2006 4:14 PM > To: Todd, KA1KAQ; Discussion of AM Radio > Subject: RE: [AMRadio] AM Transmitter Advice?? > > > No problem with them mounted horizontally if in the correct > plane. Example: > For years in the ARRL handbook 1960s there was an article > that described > separate 813x2 amp for each band, all rack mounted. As a > young ham in the > early 70s I would looke that and drool. > > The 813 is a great tube, certainly very high on the > watt-per-dollar chart. > It's always been one of my favorites along with the 810, > 4-400, and the > 4-125. I always thought the 4-125 would be great as a final > for a say... > 350W CW transmitter. Like the T-9er, but with more power out. > > Anyone needing projects, or potential projects email me off-list. > No charge, I will give them away to a good home. > > 73, > > Mark W1EOF > > > -----Original Message----- > > From: Todd, KA1KAQ [mailto:[EMAIL PROTECTED] > > Sent: Monday, January 30, 2006 3:46 PM > > To: [EMAIL PROTECTED]; Discussion of AM Radio > > Subject: Re: [AMRadio] AM Transmitter Advice?? > > > > > > On 1/30/06, W1EOF <[EMAIL PROTECTED]> wrote: > > > > > > I agree with Larry. I've been collecting the pieces for a 813x2 > > desktop amp > > > for awhile now. I'm almost ready to begin. > > > > Hmmm... interesting. I actually have a nice horizontally-mounted CW > > 813 transmitter sitting up over the garage. I wonder what it would > > take to add a modulator? I chuffed it into a Globe King cabinet > > because I wanted to use the rack for something else, and there it > > sits. > > > > Yesterday while I was playing around at building a > "homebrew" (ala Don > > Chester) 40 meter dipole, I was listening on 40 to a few guys > > discussing the venerable 813. One of them was Tom M...Marcellano? > > W3BYM (I think). He's written a fair number of articles for ER as I > > recall, probably a few about 813 rigs. I think he said it was his > > favorite tube and had nothing but praise for it. At least one of the > > other guys either had or was running a 813 rig also. Wish > now that I'd > > paid more attention, but it might've resulted in soldering my finger > > instead of the antenna. > > > > Has anyone ever mounted them horizontally to save space? I can't > > remember if it's a single tube or a pair. Sure is compact. Power > > supply is in the garage because it was too heavy to haul upstairs. > > Looks like a Beastly 610 transformer on the chassis. > > > > As an aside, I think K1JJ Tom is still building a rig with a pair of > > 813s blown through Dietz lantern globes as chimneys. There were > > pictures of it on amfone not long ago. > > > > de Todd/'Boomer' KA1KAQ > -- > No virus found in this outgoing message. > Checked by AVG Free Edition. > Version: 7.1.375 / Virus Database: 267.14.22/239 - Release > Date: 1/24/06 > > ______________________________________________________________ > 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 >
