Hi, Bill.
Indeed it is a great looking project.

I don't see anyone attempting to answer you question about why the
early transmitters always doubled or tripled from stage to stage. As I
recall, this was used to minimize the loading on previous stages as a
subsequent stage was tuned. The loading caused frequency changes. This
was used only on triode tubes. When screen grid stages were used, it
was no longer necessary.

Further research would have shown 160 meter crystals were frequently
used to control 80 meter transmitters. It wasn't just because the
higher frequency crystals were not available. They were just more
expensive.

Again, a great looking project. I do see a modern resister in there,
however.

73's, Paul, KD7HB


On Nov 11, 8:35*pm, exray wrote:
Hi,
I've gotten far enough along with this project to where I'm ready to
toss it out for public scrutiny, so have at me, guys.

I'm a receiver guy - never built a tube transmitter from scratch and
this is my first go. *My goals were, in no particular order, to build
something with a early 30s breadboard look, xtal control, 40/20 meters
primarily - 80/30 as bonus, moderate power for getting on the air
barefoot while not overpowering a future amp idea...and of course using
accessible parts.

This is sort of my compilation of ideas from old QST articles. *Robbed
ideas from this and that to make them fit. *I made some major boo-boos
at first but I think I finally have them sorted out. *Something that
dawned on me a little bit slowly is that none of those old xmtrs were
set up to operate 40 meters with a 7 Mc xtal. *Much of the emphasis was
on double this/double that. *Nowadays we have 7 and 14 Mc fundamental
xtals abounding so I went the route of reinventing the wheel so to speak.

The rig is working at this stage...at least straight thru on 40.
Waiting for some other bits and bobs to carry on to other bands. *The
note sounds good and its nothing I'm reluctant to put on the air. *On
the other hand its a massive amount of wood and metal for a measly 5 or
6 watts *A little slatboard 6V6 chirper would have been much easier.

Anyway, I'm not a veteran with old xmtrs so I'm putting it out for
comments, questions, critiques, etc. *Flame suit is handy!

Schematic:http://i132.photobucket.com/albums/q...r/schema111108...

View:http://i132.photobucket.com/albums/q...r/Dscf1436.jpg

-Bill WX4A/KP4