Tim 700
Active Member
Last edited:
How It's Made - Vacuum Tubes
- Thread starter Tim 700
- Start date
Register to hide this ad
I am surprised the plate can be toughed with hands (no gloves). At a CRT plant I set up, every electron gun assembly was pre-cleaned in a heated gas before being set in the glass neck. We used RF to flash the getters in a large oven that held many CRTs. We used oil dispersion pumps with a refrigerated vacuum entry point just before the tube vacuum stem to pull a faster vacuum.
Somewhere I have the complete unpublished GE-MIT study that details how to manufacture vacuum tubes. It talks about how to weld tungsten to copper using molybdenum clips. Carbonize thorium tungsten using a 'tee shot' of acetylene with the tungsten filament at an elevated temperature stated in Kelvin degrees. This stabilizes the tungsten filament for controlled thorium loss in direct filaments. Thorium is an unregulated radioactive material used to assist in the flow of electrons in vacuum tubes.
I think I will just buy completed tubes myself.
Somewhere I have the complete unpublished GE-MIT study that details how to manufacture vacuum tubes. It talks about how to weld tungsten to copper using molybdenum clips. Carbonize thorium tungsten using a 'tee shot' of acetylene with the tungsten filament at an elevated temperature stated in Kelvin degrees. This stabilizes the tungsten filament for controlled thorium loss in direct filaments. Thorium is an unregulated radioactive material used to assist in the flow of electrons in vacuum tubes.
I think I will just buy completed tubes myself.
Last edited:
jaymanaa
RIP 1961-2018
I thought they were 845s.
seriously, we could have a selection of popular vaccuum tubes available with no filaments required, and outperform the regular ones....and last forever, essentially, with power savings, much less heat and instant on...sound good..? I'll bet they would! If we will contact anyone in the industry here or in europe and keep asking for these things, they will see a market for them and make them...I have already sent an email to the guy in NYC making regular tubes and have been in contact with an english company that will coat anything you want in an amorphous diamond film...and at reasonble prices. The product coating is called "adamant" and is made by the diamond hard surfaces co. The email is ...chris@diamondhardsurfaces.com I am not sure an amorphous coating would work as normally, as far as I can tell, a crystalline coating has been used since the early 90s in experiments with the concept at MIT and others....a small research study by a major manufacturer is in order, with a potential huge payoff for someone...I'd buy them, and think that would be a worthy investment, even knowing that as the market progresses, prices will drop....oh and thanks Tim 700 for the cool video upload....and to sony6060, lets rock, diamond style......edd
Last edited:
Billfort
Addicted Member
So true, and worth every penny.
jaymanaa
RIP 1961-2018
MRL_Audio
RIP 2022
Was reading a thread yesterday on cleaning tubes so as to not remove the printing on the tube. Lot's of opinions on that front. There was some back and forth on the handling of the tube and the oils left on a tube from human hands. Interesting that the video has the final handling done with what appear to be soft cotton gloves.
Pio1980
AK Member
One of my mentors, Lane Upton, worked at Eimac/Varian in SLC and SoCal in R&D and spent some time in China as a consultant setting up the then-new tube production facilities. I remember him recounting the tussles between the engineering and bureaucrats which usually resulted in unusable products until engineering prevailed. Any questions I had for him concerning tubes always got me the right answers.
You guys are a real asset for the rest of us.
Last edited:
