Hello, I am looking for somes plans or a schematic to build an AM broadcast transmitter. I want to be able to listen to Old Time Radio programs and music on my pre-war AM radios, I have many vintage radios that I love to listen to, but there is usally only talk radio on the local stations.
Thanks
David

Syl has a nice design, but I can't find it on his site. You can contact him directly and find out where the schematic is: http://www.oldradioz.com/forum/index.php

http://www.smecc.org/graymark_transmiter.htm

Here's one that looks interesting. It uses two 50C5 tubes, which may make it a bit more powerful. I don't know. I would like to try building one. The coil is the four lug two separate coil type. www.tubesandmore.com sells slug tuned coils, but they are usually the 3 lug type where the two coils are connected together to one of the lugs. You can still make this kind of coil work. Connect the lug where the two join to B- as shown in the schematic. The small coil end will go to the grid through the appropriate condenser shown in the schematic. The large coil will still have a condenser bridged across it. Instead of connecting directly to the plate, you'd use a .0001 MFD condenser to connect it to the plate.

I should try building this for myself. It may be very interesting to use.

Thomas

Depending on your interests... do you just want to have a nice little powerful AM transmitter to play/broadcast your old tunes? ... or does it ALSO have to be a "tube type" transmitter?

I recenly bought a transistor AM transmitter kit for only 99 bucks and they also have a 35 dollar model.
I bought it from www.Ramseykits.com
I haven't built it yet... but it is here.. lol.

Here are the links for that transistor model.

And.. listed further below that I've included a couple of links and a schematic for that very poular Knight Kit 50C5 transmitter that was available in the 50s. There is also a wonderful story there too about a guy from "AM Daytime" KHGL radio that has used this little 100mw transmitter for over 20 years!!

Transistor Transmitter kit:

$99.00 model:
http://www.ramseyelectronics.com/cgi-bin/commerce.exe?preadd=action&key=AM25

$35.00 Model:
http://www.ramseyelectronics.com/cgi-bin/commerce.exe?preadd=action&key=AM1C

Tube Transmitter:
Knight Kit 50c5 transmitter schematic and info:

http://www.smecc.org/knight_kit_home_broadcasters_-_allied_electronics.htm

http://www.smecc.org/wpe_files/wpe1C1.gif

http://www.knightkit.com/knight_articles/shiningknight.htm

http://www.smecc.org/broadcasting_from_the_home!.htm

By the way.... if you have a signal generator... you can also use that ...but not very far.

Just feed your CD player output into the audio input and tune the RF output to a quiet spot on your AM dial and place the output of the signal generator near to your radio antenna and VOILA!!!

Go to this site, this is Syl's transmitter. There are pictures, schematics, and some good reading.

http://antiqueradios.com/forums/Forum13/HTML/004443.html

Dave