Hey what about this Single 813 driven by two 811's

[Jack-KA3ZLR-]

I seen a post that mentioned this, is there such a beast..? i'd like to start a discussion on this , any schematics availible...pictures , any help... :?:

[Steve - WB3HUZ]

The link below is info on a pair of 813s modulated by a pair of 811As.

http://www.amwindow.org/tech/htm/813/813.htm


There was a series of articles in QST in the mid-50's (Three Control Six-Band 813 Transmitter) on a complete transmitter (VFO, driver stages, modulator and PS) based around a single 813 modulated by a pair of 811As. The articles are listed on the ARRL AM TIS page.

http://www.arrl.org/tis/info/am.html

[KA8WTK]

The 52, 53 and 55 ARRL handbooks show how to build the single 813 x Pr. 811 rig. I can say this as I have these Handbooks. I should imagine the other 50s books are the same. The 53 shows 2 versions. If you can, look at all the 1950's books as there were a couple more variations printed over the years.

[WB6VHE]

Greetings, fellow AM'ers!

I have another single 813 xmtr from the 1955-57 handbooks, "A 500-Watt
Multiband VFO Transmitter," that may be of interest.  This was built in the 50's by another ham (identity unknown) and I found it under a pile of junk in a local surplus
joint a few years ago.  I rebuilt the whole rig (which is the rf deck only) and built a power supply and modulator for it (modulator uses 100TH's, not 811's).
I chose the former tubes so I could power the whole rig off the same
HV supply and still run 2kV on the plates.  Is there some way I can post
a picture of the rig for all interested?  I don't have a website so cannot
do this via a web link.  Anyone who has worked me on 40 meter AM has
most likely heard this rig on the air.  It's sweet!  Puts out almost 350 watts
of carrier.  I've made a number of mods to the original design to improve
performance.  I also run this rig on cw at 500 watts input (about 400 watts
into the antenna).  There was a whole series of articles in QST about this
transmitter over the period of 1954-1956, detailing various modifications
and answering questions from guys who had built the rig.  Apparently it
was one of the most popular construction projects ever published in QST,
judging from the comments in the articles and the continued interest in
the rig over a period of years.

73 to all,

[W8ER]

[KA8WTK]

Jack,
Pics you want, eh?
http://web.raex.com/~ka8wtk/ham/frankenmitter/frank.htm
This is Frankenmitter as I originally put it together. It since has had a better mod iron and a better HV supply for the 811 modulator pair added. Also, I wound a new split tank coil and driver coil for 160m and moved it there.
These are sweet rigs to construct and operate.

[Jack-KA3ZLR-]

Well thank you Bill, now see that's the thing, here's a transmitter it doesn't take alot of Parts, it isn't gona break the bank and can be had at relatively small cost...

I'd like to see more of this come up here, Pictures and Documents for the group, we have alot of members now and alot that don't post but DO read so that's the thing i'm trying to stress, what we take for granted there's a multitude that are just catching on and getting with the program..

All this is great Please keep it up... Share the knowledge brothers...

[WB6VHE]

Thanks, Larry, for posting the pics of my rig; Jack, this is somewhat along the lines
of what you were interested in, although with different tubes as modulators.

73,

[Jack-KA3ZLR-]

Hi Ken this is FBOM stuff and i'd like to see more if there's any availible this what we're all about here and any input is very much appreciated...

Thanks guys...