Homemade spy transmitter.

[@cringemaki]

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

[@LA6NCA]

Nice to hear.

[@alesan3729]

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

[@ladronsiman1471]

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 ..

[@RandomRetr0]

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

[@LA6NCA]

Yes, it is a very good contact. By creating such a standardized pinout, I can use the power for many new designs. I also recommend this to other designers of ham radio equipment.

[@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.

[@5P2BA]

Helge, it’s always with great pleasure to watch your “well thought through videos”. Everything works and educational at the same time 👍 tnx Frank

[@LA6NCA]

It's fun making videos with such nice comments.

[@keithglaysher9201]

Great work Helge! And now for your next challenge, a TX/ RX and power supply..........in the same tin! impossible.

[@thomthumbe]

Wonderful!! I am now practicing my CW once again. I live too far from you, but maybe some day we can have a QSO! You are a good man to help keep older radios and tube technology alive! I have spent more time lately in the CW bands! Especially 80 and 40 meters. Thanks!

[@LA6NCA]

Thanks for your interesting comments.

[@marcusf.6722]

Impressive. So compact

[@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 😊

[@LA6NCA]

Thanks for the comment. Yes, tube design is a lot of fun.

[@CanuckHam]

Amazing transmitter!

[@bluethunder6801]

Brilliant work and video. Thank you

[@donalfinn4205]

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

[@kcscarecrow]

Good project Heldge. I've used those little metal cans for lots of little projects.

[@VIDS2013]

I have a 1960s Japanese-made Univox guitar amp that uses a pair of 6AQ5 output tubes. Nice sounding tube for audio applications. Basically a miniature 6V6.

[@LA6NCA]

Yes it is a perfect tube for small amplifiers and transmitters.

[@glitchtechnik6989]

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

[@sophoklesgreek3237]

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

[@LA6NCA]

Thank you :-)

[@understandthetimes5721]

Great work, 73!

[@Studyelectron]

Good job results of practical expertise 🎉

[@alperaner9475]

Nice meeting you at Smarholmen and very interesting to see you "Spy transmitter"!

[@LA6NCA]

It was fun that you wanted to watch the video and write a comment. Smarholmen was a nice place to which we will return.

[@greengrayradio1394]

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

[@LA6NCA]

Thanks for the comment. It is not optimal with minijack. Can't find anything else that small. It withstands the tension well. There is a danger if you touch one with voltage. But since I use the ring for 250 volts, the current will always go the shortest way to the tip or gnd in the innermost part. But I never turn on the power until everything is mounted.

[@greengrayradio1394]

@@LA6NCA You could use a mounted power lead on it, or find a small female 3-pin chassis mount male (mini-DIN?) and female on the cable?

[@paulsmeltzer4414]

those rainbow caps are wild!

[@PA2OLD]

Very very nice experiment, thanks for the video!

[@electrifyingvids3545]

Very nice. I built it but I only had 12AU7 tubes at the time. But since the 12AU7 is a twin triode tube, only one tube was needed. The performance wasn't great but it worked to some extent. It could be because the tube is not meant to be used at such frequencies, or that I used 160v DC instead kg 250v. Update, I designed a new HV power supply that uses 12.6v for the thing and it outputs 350v DC. But the problem is that it takes 10 minutes for the thing to reach that, charging up the capacitors. And once I press the key, the voltage drops off quickly. It would be a nice video to show off your HV powersupply.

[@StephenRapley]

Thanks for the excellent video Helge. Have you published the schematic or other construction information about your switched mode power supply? That looks very interesting and useful.

[@LA6NCA]

Thanks for the question. I can post drawings on my website. www.laud.no/la6nca/

[@SeAfasia]

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

[@LA6NCA]

Thanks for the comment. Maybe we'll be heard on the air one day.

[@binder098]

Fantastic…. Hello from New Orleans, Louisiana USA. Frank KK7HI

[@rparkin7]

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

[@LA6NCA]

Thanks for the comment. I am using a 4046 oscillator driving two mosfet transistors. I can post some documentation on my internet site about it. www.laud.no/ww2/

[@rparkin7]

@@LA6NCA hi. Thanks for the reply. That would be interesting to see. I did take a look at your website but only found your low current battery replacement.

[@olivierconet7995]

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

[@queire8895]

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

[@LA6NCA]

This was a good idea'. Maybe I'll make one like this later. And takes in a small tuner.

[@queire8895]

@@LA6NCA great, looking forward to see your new work.

[@YT7RR]

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

[@ElectromagneticUK]

I spy a great video, thank you.

[@rabingranatkagor]

good job !

[@volvoman177]

За старания тысячи лайков. Спасибо! Ты классно собираешь приборы

[@zen4men]

You should write a book, Helge, =============================== on WW2 German and Resistance radios. I think there would be a worldwide market! .

[@LA6NCA]

Thanks for the nice suggestion. I have a website. I will try to upgrade it with what I develop.

[@zen4men]

​@@LA6NCA Good idea! My father was a WW2 submarine officer on HMS Torbay, and Torbay was on one patrol off northern Norway covering an artic convoy. / My mother's war was never spoken of in her lifetime, but she was involved with French Section SOE, which I discovered with a bit of detective work. So she was part of the organisation that prepared agents to go to France, equipped with radios such as those you take such good care of. / And I am aware of the courage of Norwegians under the heel of the German jackboot, for which I have a lot of respect. / Plus I have Viking blood in me, as I have Macleod Scottish highland blood in me, which it is said leads back to King Harald Hardrada of Norway, killed at the Battle of Stamford Bridge in 1066. Best wishes, Zen

[@NielsEHolm]

Love it :)

[@ciptalabs8185]

Thank sir for information,,

[@MrBugsier5]

works Great Helge! 73.s!

[@ahczma]

excelent idea

[@Studyelectron]

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

[@123norway]

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

[@dxexplorer]

Beautiful work... very nice transmitter. I didn't try anything with tubes yet. I must learn a little more about it... but I know for sure I want to have fun with this. Thank you for sharing this nice project. 73 DE YO6DXE.

[@LA6NCA]

Thank you.

[@overkillaudioinc]

Very Cool!

[@pepsodentpasta]

Nice

[@joeblow8593]

Very good

[@UpinkProduction]

I love it good 👍

[@k7iq]

CooL !

[@hamzadine]

Morset transmitter long wave...

[@Cyklonus]

👍👍

[@LA6UOA]

Fascinerende! 73 de LA6UOA

[@santiagogarcia30]

👍👍🔌📻

[@kaladakalada4279]

Hi

[@georgegonzalez2476]

Nice job, with a big whoopsie. Putting 250 volts through a 3.5mm plug is a bad idea in at least 4 ways. I’m sure you can think of at least two of them.

[@bennock1017]

not really a "spy", more a ham radio set which most of us have built. Why use "Spy"? just to get views?

[@LA6NCA]

I have restored lots of real spy radios from WW2 and the Cold War. Have also made a number of videos about them. For me, this is a design in this "spirit". I don't really have any experience with QRP radio amateur QSO's beyond what I have done with these real spy radios.

[@che59v]

It was all good, till the glass tubes came into the project, yet I can to understand some enjoy the 300v zappppp.

[@ciprianpopa1503]

every single volt is under the hood if well designed as it is also the case with any electric appliances. I'd be more worried about burning the finger tips.

[@electrifyingvids3545]

When under normal operation, there is no HV being exposed, apart from the transmitter output, where you can get RF burns.

[@AndersNielsenAA]

I love these minimal builds. If you crash on a remote island it's good to know you can call for help even if you can't find a single transistor :) 73 de OZ1AN

[@TheRogey1]

Along as you can find 240 volts and 12 volts😏😅

[@AndersNielsenAA]

@@TheRogey1 Assuming enough lemons, no problem :)

[@renatorosso3692]

Very good number one

[@ryszardhermaszewski6035]

SUPER 73 SP2JJ

[@larspregge6420]

Nice. Here is an only 1 Bulb transmitter of dl8dtl, Jörg Wunsch. www.dl0hbs.de/bilder/mas/dl8dtl-1.jpg

[@HL1KKC]

vy nice de HL1KKC