Homemade spy transmitter.

I am designing a small tube spy transmitter.

[cringemaki]

Don't you love when old folks have fun? We need people like this man. He deserves more views!

[RandomRetr]

Very nice. I really like the repurpose of XLR for supplying power

[ladronsiman]

We have in the US Nuvistors .This are small vacuum tubes that were designed for portable communications ..They are very small tubes, and they last forever ..

[greengrayradio]

Nice miniature transmitter. The one thing i did not like is the exposed mini jack plug with 300 volts on it!

[glitchtechnik]

Beautiful transmitter build! I have built a Rockmite in an Altoids tin and hope to try this design!
73 AA9IL

[smstiao-tecnologia]

Projeto simples mas funcional! A 6aq5 na saída para os QRP's é uma ótima opção.
Parabéns pelo seu projeto e contatos, forte 73 de PY2SNN TIAO.

[Studyelectron]

Good job results of practical expertise 🎉

[sophoklesgreek]

as always Helge.. that was very educational and fun to watch. thank you

[norway]

Great video! At the end the subtitle said "Stay tuned" - pun intended?

[rparkin]

Hi Helge, and thanks for the great video. I've been playing with similar MOPA style valve TXs for a while now and learning a lot. One thing that I tend to do is run from small Chinese SMPS boards which can be quite noisy. I'm really interested in your PSU set up. Are you using an TL494 driving fets and a mains transformer in reverse ? Would be really interested in a video on that. My current project is a small TRF RX and MOPA TX all based on Battery Valves. Hoping to do some Valve SOTA activity :-) 73s and GL

[PAOLD]

Very very nice experiment, thanks for the video!

[SeAfasia]

Ge es Gm Helge, nice item and amazing constraction... hpe cu on air soon ...tks for your posts 73

[Studyelectron]

Just for a glimpse one can travel miles and miles and why not view viewable worth enjoying technology advanced brains

[queire]

GOOD WORK. If this transmitter can have one light bulb for RF power amplifier or antenna current indicator, this will be a perfect transmitter.

[YTRR]

I hope to meet you on frequency !! best 73.

[olivierconet]

Very well explained, thanks.
I really like the care taken in grounding and decoupling. You are an experienced Ham, no doubt 😁
May be a little affraid of the 300V on the jack connector. I would certainly put my fingers on it one day or another 🤣.
73, F1SOC

[alesan]

Really fine and well done. The Spy radios are really charming

[RadioProyectos]

Brilliant project, as always, I am precisely working on a similar project but for AM, using a hexode triode ECH81 as oscillating and modulating tube, and with excellent results.

73 of EA1FLL 😊

[zenmen]

You should write a book, Helge,

on WW2 German and Resistance radios.


I think there would be a worldwide market!
.

[donalfinn]

Very well done👏. I wish I had your knowledge!☘️👍