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.
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.
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!
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.
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.
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’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, 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.
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.
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
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.
@@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?
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!
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
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!
Not quite dead. It was close. But in the end it acted like a normal tube - well sort of.
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.
Excellent series!! Thanks again
And thanks for watching.
Interesting. Thanks for a nice presentation.
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.
Never seen a Nutube before, but it looks like it is doing a great job. Thanks for showing it working.
Its amazing to think that a Fluorescent Display could be made to amplify and oscillate, but this is not much different from the early gas tubes.
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!
Thank heavens. Please report your progress!
Congrats Mike , amazing work, i like your sliding tickler coil, genius ! Now on to S.W. (hi) 73 Jerry K9UT
Dunno about that Jerry - but maybe 160M? or GRIN 80M?
that was really impressive.
Just discoved your channel. Its FANTASTIC!!!!!!!!!!!!!!!!!
Well thanks for dropping by! It's gonna take a long session to check some of these fun projects out.
Most impressive.
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.
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.
If you used a negative voltage for your heater supply, the grid bias could be developed from that.
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.
Like a vacuum integrated circuit... :)
Yes - an odd device. But this is the basic structure for electro-fluorescent displays.
Would be nice to make that into a pocket radio and a 48 pin dil socket would have worked for the tube socket.
You must have big pockets! It only has pins on one side which is odd. It is really more of a SIP.
Interesting if you cannot go up it's VLF next then .
Had to think about that one !
Now here is someone who is thinking! Yes maybe VLF. But I can't do another REGEN for a while or there will be pitchforks.
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?
"Just another vacuum tube." Just another Mike magic work!
de SA3BOW
The transformer just came in. Let's see if I can drive headphones.
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.
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.
It's all your fault David! Ha. The impedances are just too high for RF Amplification in a conventional sense. Perhaps grounded Grid?
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
The filament does not light up visually. maybe a soft orange glow on the wire...
Great content. What do you use to draw your circuit diagrams.
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.
I am attemting to build this on a wooden board. Any tips? How would litz wire play with this
Be careful of course with the bias. Litz wire would work better as it allows higher Q out of the box (even before regeneration).
@@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?
Mine works . It’s getting the local am station just fine :)
Wow that makes 2 of them. Ha. I am really impressed that you took this on!
This was an incredibly fun project to take on. It’s a fun set to play with. Whoever dies with the most radios wins 😤✋
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!
Could we use the Korg in a Tv antenna preamp for vhf and uhf. I have a Ramsey Electronics Model No. PR2 that works best for me
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!
@@MIKROWAVE1 Thank you for your reply, Could you think of a future project of VHF preamp using a suitable vacuum tube again thank you for replying.
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
It shows that even a Coke bottle will work in there. Well done.
Maybe with a metal straw in it. Carbonated Triode?
@@MIKROWAVE1 😁👍
My radio gets the low end of the band 600 - 800 my tickler coil has 60 turns my main coil has 120.
Very Nice. Try a tap at 75 turns to hit the top of the band maybe with a switch so you can do both ends.
Bias Batts.
Try Ultimate Lithium AA. MUCH higher capacity. Watch the voltage...
off load. 1.7- 1.8 volts