Fellow radio hobbyist Jon the Grimm built this beautiful “homebrew” AM transmitter using tube technology, in the style of an original 1930s radio transmitter. Operating under Part 15 regulations, his transmitter has achieved a short range – perfect for feeding modern music to antique radios that might not otherwise have a way to receive programming without interfering with your neighbors reception.
Built using period-correct enclosures and wiring techniques, this 5-tube transmitter uses the aesthetically pleasing “globe” style of vacuum tubes: #36, 37, 38, 38, 80 according to this schematic:
His inspiration came from this photo of an original 1930s-era miniature AM transmitter:
Jon posted some design photos in the thread at the Antique Radio Forums, which I’m sharing here. You can see the design take shape, from the initial circuit prototyping, to the full breadboard, to the final product. I especially like paper towel/toilet paper tubes being used as coil forms.
It’s a functional work of art. If I didn’t see the construction photos, I’d swear it was actually from the 1930s. Some more views, note the attention to detail with the wire lacing.
And with the last touch, correct power and switch knobs:
Jon doesn’t have a web site, but I thought his work deserved some recognition. This is a stunning piece of engineering, using period-correct pieces combined with a modern eye for engineering and circuit design. Not to mention it’s just beautiful. You can contact him via the Antique Radio Forums if you have any questions for him about the build process.