Damn! Everytime I think I have everything, someone has to show me something like this video to make me realize I need to live another hundred years to be able to do all the things I want to do.

In addition to a very complete machine shop he appears to have a professional glassblowing laboratory, and a knowledge of electronics. Plus, he speaks French!

Sigh! How I am going to explain that I need a glassblowing laboratory to my wife?


PS Clearly, if he can make a vacuum tube he can adapt a pen to fit a plotter. I don't think it took him more than a minute to figure out how to do that. The only question I have is whether he thought about making the holder out of blown glass or out of machined metal. He probably could have done either.

-----Original Message-----
From: Daniel Koller, Sent: Tuesday, December 31, 2013 7:03 AM

Chuck is correct. The relevant footage is near the end of the video where he tests the tube. Link is here in case Yahoo lost it for you:

Just a lathe? There were little "wings" on the pens that twist-lock into the holders. I supposed I could start with a rectangular piece of stock and turn all but the wings. Anyone have one of these little pen adapters?


On Tuesday, December 31, 2013 9:21 AM, Chuck Harris <> wrote:

He is referring to the little video on the making of a triode
in Paillard's home shop. In the video he draws the traces of
the new triode using a home made manual curve tracer, and an
HP flat bed plotter. I think the pen is not a ball point, but
rather a felt tip, or roller ball pen. HP used to make an adapter
to the old Flair (tm) style... an easy job if you have a lathe.

-Chuck Harris

gerard_constant wrote:

--- In, Daniel Koller <kaboomdk@...> wrote:

Of relevance to the HP group, did anyone notice Paillard is using a standard
ball point pen in a vintage HP plotter? Â Nice trick. Â In fact, all very
nicely done!

Interesting !! Where did you find that ?? A quick web browsing does not show me
anything useful ?? Thanks

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