1 tube regenerative receiver

My very first regenerative TUBE receiver, it even outputs to a speaker with decent volume, quite a bit of hum though, but it works. It uses a UCC85 television tube, that is a Dual-Triode with 26v heater...pushed a bit over the limit in order to get a loud audible sound, I tried the ECC85, that worked too...but this tube can be pushed further with less distortion. Good thing too...because I have a LOT more of the UCC85 tubes ;). It's based on the simple regen-principle you can find on youtube, so I think most of you would be able to make this one out of pretty much ANY double-triode you can find in your tube-box, so just get going. The trick would be to improve on the sound.

I'll be adding more tubes (pentodes) in order to amplify and improve the sound later on. Keep tuned!

Category:

Science & Technology

Tags:

• regenerative
• tube receiver
• tuberadio
• tube-receiver
• homebrew
• electronics
• diy
• shortwave
• tube shortwave
• radioamateur
• hamradio

[Jo0ngle]

Yes, I think they´re mostly TV-tubes. But like transistors, they do what they´re supposed to, and you can build radios out of most tubes with triodes & pentodes.

[g3ryp]

Hum's tricky to get rid of. There's a lot of it about in the average house. Shielding may help. You could try running the heater from smoothed dc rather than ac. Earthing arrangements are important too. A separate earth for your receiver would be a good idea. It's amazing how well a single tube can perform. A lot of fun - good luck.

[Jo0ngle]

True that. I'm building it a chassis. I have a link for it, but every time I try to post this link, the answer to you gets discarded...

[g3ryp]

The UCC85 has a 26 volt heater. I'm surprised it works at all on 6.3 volts. Perhaps this is why you're getting better results than with an ECC85.

[Jo0ngle]

You're absolutely right! I ran 26v on it today, and it worked a lot better, still has a lot of hum though, I suspect this will be reduced when I mount it in a shielded cabinet.

[hrbear]

Is this collection at the beginning all TV tubes?

[dardiani]

Ha-ha, I hear transmission in the Belarus language!

[Jo0ngle]

Hi, and thanks! I'll take a look.