It is a real testament to your determination that this works. I really thought this was a dead project after you went over the tube specifications in the last video. Great job!
Excellent Work Mike !!!!!!! It's alive....... There's nothing better than taking advantage of some undocumented features, the difficult we achieve immediately, the impossible takes a little longer.
GUdday MAAAAAAAAATE! Thanks for watching this display of luck and positive thinking. I do believe we have approached and gone beyond the inpossible with this one.
Great Job Mike! I'm sure you DID make history with your Korg-Regen! I'd probably be on my 8th tube getting that far (only if the previous 7 fell out of heaven!)! Really enjoy all your project and deep-dive videos! A person learns so much by watching the incremental-struggle/progress as to the hows and whys. Much of the stuff your getting into, I never got a chance to play with so you're being 'my' Elmer for sure. 73...
Heaven is right at these prices! Hey they may seem expensive, but I remember making my dad buy an EXACT tube for a project for me, and the radio repair shop scalded him on the price. The killer was that any of the old TV pull out tubes I had in the junk box would have worked fine.
Well they lit up and did not explode and that is always good! Truthfully, I was counting on the fact that the data sheet had to be somewhat soft and conservative.
In very early valves with direct heaters, this idea was explored as well with some portion of the filament more negative than the other side. The idea was abandoned when they found out that the grid was a better place to control bias.
@@MIKROWAVE1 You are using a large series resistance to reduce the voltage to the heater to what is needed. Thus you have the supply I suggested. The heater of the NuTube only has about 0.7V across it. The rest is in the resistor.
I wired my circuit exactly like the schematic and I cannot get my tube to even light up. 6v battery for filament I have the two triple a I used a 20v batter and a 12 v in series is there simply not enough voltage? What could I be doing wrong
Hi Mike, amazing that you managed to get this device working in this type of circuit. Question - you have some precautions to keep the audio bias under 20uA but how about the regen tube? At some point it looked like it lit up brighter than the audio tube. OK, you are running the regen tube at a lower plate voltage which helps, but is dissipation an issue in the regen tube at all? Besides the filaments you got yourself a receiver running on an extremely low power 🙂
Not doing anywhere near due dilligence from an engineering perspective here - thats for sure! Who knows? All we have is a pretty sparse data sheet and folks building on existing reference circuits that are mostly low voltage.
Could you avoid two coils for the Broadcast Ban (Medium Wave in UK) by using a 500 pf tuning Cap. or maybe a twin gang 350 pf strapped together. By the way, plug-in coils are even more of a problem in the UK. Not seen such formers for sale here since the Eddystone days. That was when I could grow hair but not a beard. Now can grow a beard but........... Are those formers still available Stateside? 2 Ace videos, as always! Incidentally, I would prefer a capacitor to throttle the regen.
What about 2x KORG Nutubes wired like the schematic for the SO42P and use it for the Mixer and Local oscillator and a regen stage as the detector stage operating at 455Khz like a normal radio.
Canvas, a Drawing and Illustration program that I developed schematic symbols for. It is not an electronic program - no connectivity or net lists. Pure art. Corel Draw would be similar. The nice thing is that I can simulate any schematic style or era. I have no Idea what AA8V used.
Thanks for watching! Well no on VHF. But there is a possibility that Korg may develop the idea further into more practical devices that can truly have RF performance. This device was a teaser for the audio guys at best!
For vaccum tube circuits, It is hard to beat the Cascode using a low noise dual triode like the 6BZ7 or a pair of low noise nuvistor triodes or the push pull with a common cathode dual like 6J6 as a VHF preamplifier.
@@gadgit80808 This is a classic first generation VHF broadbanded preamp using a push-pull 6J6. This was employed for early TV tuners, but this application is for 2 Meter Ham use. worldradiohistory.com/ARCHIVE-RCA/RCA-Ham-TIps/RCA-Ham-Tips-48-04-08.pdf
Thanks for watching! People get nervous about trying things that are expensive in unknown territory, and this was one of those moments. I have heard about kids back in the 30s working with an expensive tube that they saved paper route money for, and accidently putting the B+ voltage on the filament and blowing it up in the first seconds.
@@MIKROWAVE1 I love u. Ur content is great. I am using solid copper wire to wire all the connections. I like the look it gives. You replying is like talking to a celebrity 4 me. This radio is AM only correct?
I’ve been watching most of your videos now, I have a question to ask, what are you using for a antenna and if it’s a self made antenna what length wire/dipole are you using?
Hi, Mike. It is a nice project. I love the undocumented us of electronic components, so.... You are a maverick radio engineer. Congratulations! I will make the second vacuum fluorescent display receiver to make more history. 73's fom Argentina my friend!
A timely reminder, perhaps, that the foundation of Armstrong's early work was trying to squeeze more performance from the low-gain, frequency-compromised De Forest audion valves of the time... 😁
And Meissner with those Lieben Valves that were "wet" types (low-vacuum valves with gas). Bias was not well understood either, nor was oscillation in those early days and they were killing tubes. they were trying to make the tubes amplify, but I have to believe that many were oscillating wildly without them realizing it!
