Homemade thermionic valves

[Dylan Distasio]

In case someone in the group didn't see this, I thought people might be interested in some homebrew tube making.  Pretty cool stuff!

http://dai.ly/c1XDPd

[Terry S]

I never get tired of seeing that video, What amazing craftsmanship!

[Nicholas Stock]

C'est Magnifique!

First time I've seen it, brilliant, simply brilliant...

Thanks for sharing!

Sent from my iPhone

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[Nick]

This has been around for a good few years and has beem discussed here and on the old Yahoo group several times. It geat to watch (I like the music) - he's not just skilled, he's an artisan.

Find his homepage and have a look at that - there' s loads more there...

Nick

[Nick]

On Thursday, 3 May 2012 05:48:04 UTC+1, Nick wrote:

This has been around for a good few years and has beem discussed here and on the old Yahoo group several times. It geat to watch (I like the music) - he's not just skilled, he's an artisan.

Find his homepage and have a look at that - there' s loads more there...

Moral - don't send updates from your 'phone when on a train! Too many typos... 

He is called Claude Paillard and his homepage (in English) is http://translate.google.com/translate?u=http://paillard.claude.free.fr/&langpair=fr%257Cen&hl=en&ie=UTF-8

[kay486]

Hi there, well, if you like videos about homemade tubes, chec out this guy. He makes all sorts of tubes and he explainst the individual steps really well.
http://www.youtube.com/user/glasslinger/videos

[jb-electronics]

This is amazing! Thanks for sharing!

Jens

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[kay486]

You are welcome! The best thing is that he still makes new tubes/videos.

On Tuesday, May 15, 2012 7:40:22 PM UTC+1, Jens Boos wrote:

This is amazing! Thanks for sharing!

Jens

Hi there, well, if you like videos about homemade tubes, chec out this guy. He makes all sorts of tubes and he explainst the individual steps really well.
http://www.youtube.com/user/glasslinger/videos

On Thursday, May 3, 2012 3:25:47 AM UTC+1, William Lee wrote:

In case someone in the group didn't see this, I thought people might be interested in some homebrew tube making.  Pretty cool stuff!

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[jb-electronics]

The only trouble is that he has so many special equipment I think most of us are not fortunate enough to have at their disposal... But the techniques are explained very well, there is so much to learn!

Jens

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[jb-electronics]

Can anyone help me with this video? http://www.youtube.com/watch?v=3FN9J4zgsgk

What is the thing he mentions at 6:55? I did not quite catch it.

Jens

[marcin]

A shielded ball bearing? Ball bearing with metal or plastic shields on
both sides. Designed to keep dirt out of the balls and the grease in.
Here the ball bearing works as a rotating pressure seal. Neat. BTW, I
am a proud owner of a spherical audion and Flemming's valve by Ron.
Marcin

On May 15, 9:27 pm, jb-electronics <webmas...@jb-electronics.de>
wrote:
> Can anyone help me with this video?http://www.youtube.com/watch?v=3FN9J4zgsgk

[Dalibor Farný]

it is a blowhose.. search for blowhose in google (pictures..)

Dalibor

2012/5/15 jb-electronics <webm...@jb-electronics.de>

[NeonJohn]

On 05/15/2012 01:40 PM, kay486 wrote:
> Hi there, well, if you like videos about homemade tubes, chec out this guy.
> He makes all sorts of tubes and he explainst the individual steps really
> well.
> http://www.youtube.com/user/glasslinger/videos

I've just watched the X-ray tube making video (bandwidth limitations)
and I saw one thing that made me want to cry. He fired the getter
BEFORE he tipped off the tube. That's bass-ackwards. All the getter
did was to cause the diffusion pump to back-stream a little to fill the
void.

The failure of his tube to achieve a high vacuum was evident in the
internal flash-overs he experienced. A hard vacuum will not flash over.
With enough voltage there would be field emission but that is invisible.

A getter can increase the vacuum 3 or 4 orders of magnitude immediately
and another order or two after some operation. If his diff pump can do
10-7 Torr then firing the getter AFTER tipping off will produce 10-9 to
10-10 Torr. That is well into the range of hard vacuum.

Another thing I found odd was how he joined the feedthru units to the
tube. I've never seen anyone pick at a joint like that with a carbon.
The standard technique is to bring the two pieces together, heat until
quite soft, then work the two pieces back and forth a bit to make the
glass flow while gently puffing on the blow hose to maintain diameter.

I should also note that a lot of what he does on the glass lathe, us
neonists and many scientific glass blowers do by hand. It takes more
skill and practice but that can make up for equipment on a limited
budget. I did like his little resistance welder. Nifty kit.

John

[jb-electronics]

Hi,

> Another thing I found odd was how he joined the feedthru units to the
> tube. I've never seen anyone pick at a joint like that with a carbon.

I found that quite unique as well; the scientific glass blowers I have
talked to use your method as well. With soft glass, his method is
unthinkable anyway, but it seems that with Pyrex it works. I would like
to see the connections he makes through a polarising filter to check for
residual tensions though.

> I should also note that a lot of what he does on the glass lathe, us
> neonists and many scientific glass blowers do by hand. It takes more
> skill and practice but that can make up for equipment on a limited
> budget.

Yep, I know a scientific glass blower at Leybold who can do all these
things in thin air, all he needs is a flame and his hands, it is like
magic watching him do the most complicated glasswork. But this requires
a lot of experience... And a rudimentary lathe (with a turntable) can be
build rather easily.

Jens