Steampunk 1930's Ham Radio Regen!

This is an authentic early 30's Regenerative Receiver that is designed for Portable Ham Radio Operation on Batteries. Let's try to figure it out and operate it.

[@CARL557511]

Someone took their time making that receiver, I'm sure they were proud of it when they made it!

[@MIKROWAVE1]

I would love to see this show up in a picture. I will have to dismantle it. Hopefully something scratched inside?

[@W1RMD]

You have some of the most unique videos on KZbin! Thanks for sharing this with us.

[@MIKROWAVE1]

Glad you enjoy them! And thanks for being a subscriber.

[@JCWise-sf9ww]

It will be nice to hear this home made radio play.

[@MIKROWAVE1]

First it has to be dismantled - carefully...

[@Swamp-Fox]

Very interesting receiver!

[@MIKROWAVE1]

Can't wait to dig in.

[@markmelchiori511]

Mike! I'm really glad you decided to do a video on this diamond in the rough. Very interesting...like a large percentage of your video topics! I wonder if the original maker/owner was a...DX hound. (sorry) Many thanks!

[@MIKROWAVE1]

We shall see soon.

[@markmelchiori511]

Fabulous!@@MIKROWAVE1

[@frankartieta4887]

I wonder if there might some advantages in some of these older forgotten circuits. Maybe not but still I do not think a anything beats a real working example. I have a huge respect for the radiomen of the era.

[@erichkeyes5578]

I like old radio restore by the way the Franklin Oscillator lives! 2 build so far.

[@MIKROWAVE1]

Wow that is great. Nice to see some folks playing with a "new" circuit - that really is not new...

[@ingussilins6330]

Regen receiver is a freqency depended negative resistance converter. Negative resistance in antenna make "black hole" for radio waves. ( very sensitive reception ). Antenna transmitts negative resistance to enviroment thinks ( house walls, tree's ground... ) and "attract radiowaves".

[@MIKROWAVE1]

Wow like a WAVE MAGNET!

[@ultrasoundguy1]

Ah, a cliff hanger. Very appropriate for something from the 30s, much like the serials back then. Will Captain Mike regenerate the regen? Or will those old capacitors blow higher than Vesuvius? Tune in next week to find out!

[@MIKROWAVE1]

Soon. Soon.

[@ultrasoundguy1]

@@MIKROWAVE1 No rush, as the tension mounts, so will the ultimate enjoyment. 😅

[@johnwest7993]

It's always a good sign when the getter flash is still all shiny. If that's the case, then helium ingress would be my only concern about the vacuum.

[@MIKROWAVE1]

The sad vacuum tube hides its pain with a white film.

[@migsvensurfing6310]

Nice handbuild receiver. I look forward to see it working. Thank you for the interresting video.

[@MIKROWAVE1]

Its going to be tough to check initially. It will have to come apart, I fear.

[@KennethScharf]

Actually the type 30 was made i 3 formats. The very first version may have been the tubular "T" envelope, most dry battery tubes (such as the 199) were first made in the form. Then they switched to the "S" or spherical / globula type you showed, and finally to the "ST" bulb. In the '50's, they even switched back to the "T" or "GT" format again! The original "Twin Plex" circuit was from the 1930's. It was actually the same circuit as the dual type 30, but it used a twin triode type 19. I built one of these.

[@MIKROWAVE1]

Wow very early battery tubes. Not having a cathode to heat has battery benefits including less heating current and instant on.

[@DAVIDGREGORYKERR]

The Vacuum tubes made to operate of 12V Heater supply and a B+ of 12V might also work well,you know the ones made in 1957 for use in Car Radios when the transistors of the day were not ready for prime time so should work of 4xPJ996 batteries.

[@MIKROWAVE1]

Of course battery tubes are more efficient than space charge tubes because the space charge tubes require a very hot cathode. 120 mW compared to 1.8 Watts per tube.

[@utubejeffo]

How in the world did the maker of this little gem get his big fat ham radio hands in that itty bitty box? Can the sides come off or something?? How did he solder anything with one of those irons big as a popsickle in there??? Love it. Make it work! 73 K4UIE

[@mikekokomomike]

He hired a Japanese guy to build it.

[@michaelyancey3021]

Could be one of the side walls also comes off for some access. Otherwise, it's like building a ship in a bottle.

[@Steve-GM0HUU]

Maybe just had little hands 😂.

[@michaelyancey3021]

😆

[@MIKROWAVE1]

Pray for me - it will have to come apart.

[@ronalddaub9740]

Bfo man that's the coolest

[@user-bo8eq7ki5w]

Treasure. Littl *old HAM* resiver 😊. 73.

[@MIKROWAVE1]

Next it must be carefully taken apart for inspection.

[@DAVIDGREGORYKERR]

What about replicating that radio using that flat vacuum tube with the 1.5V heater and A B+ of 45V might be a bit microphonic but that cannot be helped and don't generate much heat but it makes me wonder how the manufacturer uses them in in their pedals

[@MIKROWAVE1]

Have you considered open air triodes - no vacuum?

[@thomasvandevelde8157]

The Jones 1936 Radio Handbook has a RFC-decoupled Headset and B+ line. I'll get you the page-number if you"re interested;

[@MIKROWAVE1]

The technique does block RF so it adds to the decoupling possibly improving the RF bypassing (throttle capacitor) thus possibly helping stabilize the feedback.

[@tennesseetrawlerman2228]

In this schematic at 10.23 I do not understand the filament voltage on the second (output) tube ! It seems to have no voltage to light the filament. Your schematic later on does, but this looks like an original photo??? There is 45 volts across the filament to plate, but no apparent source of filament voltage?

[@MIKROWAVE1]

Likely just an oversight.

[@alainmichaud8992]

Hopefully he will have an interview with Britney....

[@SergiuCosminViorel]

Britney, the guy? Or another gender?

[@MIKROWAVE1]

Any Brittany would help the channel.

[@alainmichaud8992]

@@MIKROWAVE1 You are doing a real good job. It looks like it is a lot of work to produce one of those every week! Is there someone helping you with editing etc.?

[@MIKROWAVE1]

Nope but it is getting crazy at this point. And my editing is not great.

[@misterhat5823]

Premiers suck.

[@MirlitronOne]

True, but try to be patient.