I bet it is but it might just have a high plate resistance. For a voltage amplifier a 470k plate resistor would be a good starting point. For driving a speaker I have had good luck with the hammond 1760C output transformer. It seems to work best with the primary configured as 8kOhms and with the 3.2 Ohms secondary connection being used to drive an 8 ohm speaker. I am really jealous of your seals by the way. I still have days where my seals end up having bubbles on the surface of the tungsten and it makes me sad :3
@@jdflyback That's why I make the seals individually and then seal them in. So I can select which ones are good and which ones are not. I was watching your and Dalibors videos and was scratching my head how this supposed to work. But everyone has their own methods.
You may know that high end guitar amps and other, FAR more, high-end music studio gear requires tubes. A lot of the old better made stock is running out in the world. I could see special tube-making becoming a revitalized skill in developed countries around the world as the need for tubes increases in this very small but important market. That's why I'm here learning this!
I don't know how I missed this upload originally but this is fantastic work! I noticed on the tubes you showed at the beginning that they appeared to be evacuated from the top instead of having a smaller evacuation stem. This is my preferred method so far as it avoids extra glasswork, although it doesn't allow for a nice, round top. Hopefully I'll also be publishing a triode video soon! Cheers!
@@thesciencefurry first one you got working on UA-cam I'm calling it the first ;-) Probably only down to tweaking your spacing, voltage and vacuum to get a good amplifying tube at this rate man. Inspiring.
I've once seen a scan of an old paper(around 60's) from an electronic company where i read that they used a mixture of barium and strontium carbonates with nitrocelulose dissolved in organic solvents to coat their cathodes. I can't remember if they wrote which solvents they used, but I think that acetone would certainly do the job. Maybe it'd stick to the filament better and make an even coating.
Good work!. I attempted to make some triodes and managed to get a couple that sort of worked. I could never make them consistent enough to put in a circuit. I did make oxide cathodes using very finely pulverised chalk (CaC02) using corn syrup to make it stick. Again, sort of worked but not well enough to pursue it. I have since bought some Si wafers from Ebay and am trying to make a transistor. Made one in high school with a kit suppled by Bell Telephone Laboratories. It contained asbestos and HF, among other things. Wouldn't let you do that today.
I'm gonna try aswell with the emission coating. You need a mix of Calcium, Strontium and Bariumcarbonate. Making transistors is very cool aswell but needs its own equipment and stuff😄
It might help you to characterise the tube. Based on that you can improve the amplifier circuit. Measure the amplification (mA/v grid voltage) at different anode voltages.
Awesome build! I've always wondered: why is solder never used? Every homemade tube I see seems to use this spot welding approach instead for all the connections.
@@smudge3446 yeah it would melt. You probably could get away with it on the plate for example but I wouldn't risk it. It gets super hot in there and if some connection fails you can't fix it.
I hope you will experiment with FM transmitters again! and then test how far you get, but with a good antenna / dipole!? or beter GP? Greetings from the Netherlands! Rob
Sorry for the late reply. I use a cheap oxy torch from ebay and just a general purpose torch. It's definitely a learning curve and you need to try things out.
Why couldn't you use something like a mason jar for this? Isolate them from the lid and then pump down the tube? I've wanted to make a neon lamp like that as a proof of concept but I don't have a vacuum pump.
Won't hold vacuum well enough and you have to leave it on the pump. At this point you would be better off to build a proper chamber for it. But a normal vacuum pump usually won't cut it.
Nice work! Anyone who makes their own tubes lands in the "proper respect" area - Glasslinger, jdflyback, Dalibor Farny, Aleksander Zawada, Nick Poole, Gerrit Deruyter, snd now you too :)
![[ EXFO ] 二極體雷射簡述 - 宏惠光電](http://i.ytimg.com/vi/fBhYvQd4bkk/mqdefault.jpg)
oh my god this is great.
If it would actually amplify :p But i'm getting there....eventually.
I bet it is but it might just have a high plate resistance. For a voltage amplifier a 470k plate resistor would be a good starting point. For driving a speaker I have had good luck with the hammond 1760C output transformer. It seems to work best with the primary configured as 8kOhms and with the 3.2 Ohms secondary connection being used to drive an 8 ohm speaker. I am really jealous of your seals by the way. I still have days where my seals end up having bubbles on the surface of the tungsten and it makes me sad :3
@@jdflyback That's why I make the seals individually and then seal them in. So I can select which ones are good and which ones are not. I was watching your and Dalibors videos and was scratching my head how this supposed to work. But everyone has their own methods.
You may know that high end guitar amps and other, FAR more, high-end music studio gear requires tubes. A lot of the old better made stock is running out in the world. I could see special tube-making becoming a revitalized skill in developed countries around the world as the need for tubes increases in this very small but important market. That's why I'm here learning this!
I don't know how I missed this upload originally but this is fantastic work! I noticed on the tubes you showed at the beginning that they appeared to be evacuated from the top instead of having a smaller evacuation stem. This is my preferred method so far as it avoids extra glasswork, although it doesn't allow for a nice, round top. Hopefully I'll also be publishing a triode video soon!
Cheers!
Pretty darn great for a first attempt mate!
Technically the third :p
@@thesciencefurry first one you got working on UA-cam I'm calling it the first ;-)
Probably only down to tweaking your spacing, voltage and vacuum to get a good amplifying tube at this rate man.
Inspiring.
I've once seen a scan of an old paper(around 60's) from an electronic company where i read that they used a mixture of barium and strontium carbonates with nitrocelulose dissolved in organic solvents to coat their cathodes. I can't remember if they wrote which solvents they used, but I think that acetone would certainly do the job. Maybe it'd stick to the filament better and make an even coating.
Good work!. I attempted to make some triodes and managed to get a couple that sort of worked. I could never make them consistent enough to put in a circuit. I did make oxide cathodes using very finely pulverised chalk (CaC02) using corn syrup to make it stick. Again, sort of worked but not well enough to pursue it. I have since bought some Si wafers from Ebay and am trying to make a transistor. Made one in high school with a kit suppled by Bell Telephone Laboratories. It contained asbestos and HF, among other things. Wouldn't let you do that today.
I'm gonna try aswell with the emission coating. You need a mix of Calcium, Strontium and Bariumcarbonate. Making transistors is very cool aswell but needs its own equipment and stuff😄
@@thesciencefurry Yeah, first I had to make a tube furnace that would hit 1000C.
It might help you to characterise the tube. Based on that you can improve the amplifier circuit. Measure the amplification (mA/v grid voltage) at different anode voltages.
Awesome build! I've always wondered: why is solder never used? Every homemade tube I see seems to use this spot welding approach instead for all the connections.
Ah maybe it is the temperature even though high temp solder exists, not sure how hot these things get but I assume its pretty hot :)
@@smudge3446 yeah it would melt. You probably could get away with it on the plate for example but I wouldn't risk it. It gets super hot in there and if some connection fails you can't fix it.
Did you build the spot welder yourself? It would be interesting to see it in more detail in a video. Great video btw.
There are tons of videos covering that and it's super simple. So I wouldn't make a video on that
finally some good content on this platform!
Aww thx😄 Hopefully I can do some more shenanigans with vacuum tubes.
@@thesciencefurry Reject Transistors, Embrace TUUUB
I hope you will experiment with FM transmitters again!
and then test how far you get, but with a good antenna / dipole!? or beter GP?
Greetings from the Netherlands!
Rob
I just love this type of content
I would love to see more stuff like this on youtube.
Wow! I build tube amps for guitar. This is next level :3
Amazing video! What kind of torch do you use? I really want to try myself. Did you had experience with glass working before?
Sorry for the late reply. I use a cheap oxy torch from ebay and just a general purpose torch. It's definitely a learning curve and you need to try things out.
Really cool project 👏
Can i use copper instead of stainless steel
You can't really spotweld copper
Why couldn't you use something like a mason jar for this? Isolate them from the lid and then pump down the tube? I've wanted to make a neon lamp like that as a proof of concept but I don't have a vacuum pump.
Won't hold vacuum well enough and you have to leave it on the pump. At this point you would be better off to build a proper chamber for it. But a normal vacuum pump usually won't cut it.
what kind of vacuum pump did you use?
@@morrisputman8592 A two stage pump from mucola
@@thesciencefurry thank you for the fast response, my follow up question is: where can i obtain such pump?
@@morrisputman8592oh damn. Totally forgot to answer, sorry. I got mine from ebay
@ thanks for responding anyway!
For those who want to make hydrochloric acid here
H2so4+nacl=naso4+hcl
HCl+H2O= H+ CL-(ions) and O-+H+ and hydrochloric acid.
wrong address mate.
Oh yeah using sulfuric acid, which is even harder to get, to make HCL😂
cool
Nice work! Anyone who makes their own tubes lands in the "proper respect" area - Glasslinger, jdflyback, Dalibor Farny, Aleksander Zawada, Nick Poole, Gerrit Deruyter, snd now you too :)
Nice 👍
Nice sehr interessant was du machst ;)
use old crt tv parts they are the best
Hey!
yo