I wanted to keep the AM radios on the property fed with a AM signal using a DAB receiver as the source.
So I strung a bunch of bits together copying what guys did in the 1950's to get the job done.

Fred.

The Radiator - DAB to AM 2CH converter

Document uploaded.

If you put two 6V6's in we should get 2CH back on the AM band in all its glory.

Brad!
Dont encourage me!!!!

I have some 807's in the junk box and a 1000 volt transformer somewhere.
I could string those together like something Tesla (my hero) would have done.
Would also double as an insect zapper, air ioniser and winter heater.................

In the meantime, it is now about a year since I made that breadboard lash up and it sits up on a top shelf in the office and works 24 hour.
Never had to adjust it since I put it there and sets just sit on tune all day.
We can call it a successful design I think.
Fred.

Hullo all.
I have constructed and installed the successor to the first "Radiator", more powerful, better made and sits in a cabinet this time with an actual Antenna so it looks like a transmitter!
As usual I had lots of mucking about in figuring out how things work and wound up with the usual compromise of half ass engineering.
I will send the story to Brad to pin to this post.
The circuit could be made by anybody using a small radio chassis with a power tranny and choke that can give 300 or 400 volt HT and a couple of 6 volt heater sources.
I used the same old 12AU7 and the common 6CG7 twin triodes, the latter has a bit more "oomph".
For simplicity I used a bridge rectifier but there is no reason not to use valve to suit a tranny, the current is below 30ma.

Anyhow read the story and if you like experimenting with valves give it a go to get audio into a AM set wirelessly!

Fred.

The Radiator - DAB to AM 2CH converter MkII

Nice article.

Have sent latest article to Brad but it does not show in post #4 yet.
Rob, the article in post #1 is the old version.
Fred.

G'day Fred, all done.

I remember seeing a lash-up for development of a TV in an article some years ago. Much more room for trouble than in yours Fred.

Jobs like this for me are in a large plastic box on the floor. Hook everything up, stand back, and turn on. Mostly reforming filter caps off a chassis HT.

Another nice article.

I've been thinking about alternate designs, but whether I get the time to actually try something is another matter entirely.