[Arran]

As I mentioned there are also phonograph oscillator kits available, I think that AES still offers one that's a one or two tube wonder based on a brand Z design. https://www.tubesandmore.com/products/ki...ransmitter Here is another one tube wonder that uses a 117L7 tube on Phill Nelson's site. https://antiqueradio.org/transmitter.htm Signal generators also have an input for external modulation that you can use to put out an AM broadcast signal, though the quality can very depending on the signal generator.
Regards
Arran