The AM Forum

OK.. I acquired a couple tubes:
2- 815
2- 807W
3- 12SK7

And I also have
1- KT88
2- 6DQ6
3- 6L6
3- 6K6
1- EL34
1- 6V6

and several dual triode Preamp tubes...

I was looking for any schematics that use the 815's, but have not found anything, yet...


I was wondering, what can I brew up that will get me on 75M, even if it is a PW'er?

anyone have any ideas?

Thanks

Several articles on building rigs with the 815:
QST, Feb. 1941, page 16
QST, Apr. 1945, page 26
QST, Dec. 1940, page 50
QST, Nov. 1945, page 23

Thanks Pete.. I'll see if I can find them.

I'm not am ARRL member anymore... I better hit up Ebay!

ARRL has available QST on CD-ROM 1940-49
http://www.arrl.org/catalog/?category=CD-ROMs&words= (http://www.arrl.org/catalog/?category=CD-ROMs&words=)

Thanks,

Just found them!  ;D

815's are a very interesting tube! A pair of 2E26s in one bottle. Still cheap and plentiful.

One with both sections in parrallel (class C rf final) modulated by one with both sections in shove yank (AB2) would make a really nice low power transmitter. (50-75w)

I have a few of them as well and have considered doing that as a "for the hell of it" project when I get some free time.

But......................... If you are really serious about building a HB transmitter, you should start scrounging up the parts to build the biggest maul that you can. It doesnt take that much more work to build a big rig than it takes to build a smaller one.

                                             The Slab Bacon

There was a 6L6 -815 tx in the1940 QST that I was just checking out
a couple days ago...looked pretty cool...
I would also consider a 6F6-807 tx.
When looking at xtal osc circuits, review those from the late 1940's.
If you go with "Tuned Plate" rather than tri-tet circuits, they tend
to be a little more stable. (IMHO) The 6F6 and 6V6 are very similar and
can be used as substitutes in many circuits.
As a suggestion, in the osc circuit try to find "carbon" resistors
rather than the more modern "flame-proof". The flame-proof resistors
have some inductance characteristics which can lead to other
frustrations in those circuits!
Also, there was  815 tx in the 11th or 12th Edition of the West Coast HB...
Of course, all are with plug in coils!
Good luck  es 73 steve 8tow

What is the West Coast HB?

Bill Orrs'  book...  its available online fer free..........   

http://www.pmillett.com/technical_books_online.htm


klc

Ahhh Thanks.. I actually have 2 of those, one from '64, and one from '72...

You want the Radiotron Designer's Handbook for some good reading. 4th Edition, 1952. Red/orange, thick. That and the Radio Handbook from Bill Orr (mid-late 50s, can't remember exactly which one) and you'll be good to go with tube stuff. Radio Engineering by Terman is another.

The Radiotron book is also good for holding doors open, it's a brick. :)

It predates Bill Orr by a few years. I have one from 1938.

A lot of public libraries will also have copies of these older handbooks; don't overlook the ones from RSGB for some great ideas also.  I just checked the 1949 ARRL handbook out of the university library since it is one of the years I do not have, interestingly enough it doesn't exist according to the circulation desk so I had to wait while they generated the necessary paperwork so I could check it out.  The handbooks really changed a lot from year-to-year in the 40's and 50's which is very nice compared to the later 60's and 70's versions.

Rodger WQ9E

The Radiotron designers handbook 3rd  & 4th addition are also available for download at http://www.pmillett.com/technical_books_online.htm 

Ive got dead tree copies of the original Australian copies of these. I belive there was a relatively recent reprint of the 4th edition. Not quite the same as holding 50+ years of history in your hand though.
                                                                Ian VK3KRI                                   

The Enoch Pratt Free Library in downtown Baltimore has a complete collection of QST, an I mean complete starting with the blue covered issue one number one, and it's not the reprint that was done in the 60's. You have to ask for them and in 30 minutes they will appear....I once had a great time looking at all the pre 1922 ones in one sitting.

how much is a original number 1 QST in near mint condition fetching these days?

How nice to have those complete QST library resources.  During my Ph.D. program days at Texas Tech in Lubbock I often took a break from the academic business journals to peruse the Radio News/Radio and Television News magazines since they had the complete bound set up into the 60's when it became Electronics World.  I wish someone had put these great Ziff Davis publications on CD or DVD ROM.  Access to those is one of the FEW things I miss about Lubbock, TX...

Rodger WQ9E