The Making of a Triode

emilesprenger · 18th December 2006, 09:52 PM

For ETF06 we made a diy Triode. It was a copy of the first triode by Lee DeForest in 1906.

This video shows how it was made:
http://www.youtube.com/watch?v=8_eLO0exato

BTW don't try this at home ..

Emile

Fuling · 18th December 2006, 10:14 PM

That´s the coolest stuff I´ve seen in a very long time!

Ed Holland · 18th December 2006, 11:10 PM

Very neat!

It reminds me of a few years ago, when I had do build an inexpensive rig to test display screen phosphors. A cheap ECC83 was cut open and used for an electron source (I tried filament bulbs but they were too fragile, and the light interfered with optical measurements). Cylindrical beam forming electrodes were made from sections of a drinks can. This directed electrons at a test screen held at B+. All parts were contained in the chamber of a high vacuum system. It was fun to see the phosphor glow as the system was powered up.

It worked remarkably well, and we obtained some decent results!

Ed

Eli Duttman · 18th December 2006, 11:25 PM

Did you notice the venue? It was Eindhoven. Philips made GOOD tubes there in the past. If only they would do it again.

anatech · 18th December 2006, 11:44 PM

The one question ..........

How did it perform ???

Excellent link, thank you!

-Chris

emilesprenger · 19th December 2006, 12:22 AM

The triodes worked .. and sounded pretty good as well!

Specs:
mu = 10
Ri > 100K (!)

The low S was probably due to large distances in tube and gas remains.

You can read a review of ETF06 here:
http://www.6moons.com/industryfeatures/etf06/etf.html

gmilitano · 19th December 2006, 02:35 AM

I thought it was funny when they tested the anode with high voltage. They said that this was the dangerous part, yet there is a guy about 6 inches away from the tube looking right at it. Mind you he had glasses on, but not safety glasses.

Fun video.

kopite · 19th December 2006, 03:01 AM

Excellent and most interesting, thank you.

plovati · 21st December 2006, 11:49 AM

Yes You can try also at home.
Look at this experiment done by a crazy Italian diyer in the del pentium1 75MHz ancient times (as He said).

http://www.audiofaidate.it/forum/top...?TOPIC_ID=1797

18th December 2006, 09:52 PM	#1
emilesprenger diyAudio Member Join Date: Jun 2003 Location: Near the big cities	The Making of a Triode For ETF06 we made a diy Triode. It was a copy of the first triode by Lee DeForest in 1906. This video shows how it was made: http://www.youtube.com/watch?v=8_eLO0exato BTW don't try this at home .. Emile

18th December 2006, 11:25 PM	#4
Eli Duttman diyAudio Member Join Date: Apr 2004 Location: Plainsboro, NJ	Did you notice the venue? It was Eindhoven. Philips made GOOD tubes there in the past. If only they would do it again. __________________ Eli D.

19th December 2006, 02:35 AM	#7
gmilitano diyAudio Member Join Date: Apr 2004 Location: Winnipeg, Manitoba	I thought it was funny when they tested the anode with high voltage. They said that this was the dangerous part, yet there is a guy about 6 inches away from the tube looking right at it. Mind you he had glasses on, but not safety glasses. Fun video. __________________ DIY Audio Projects [ 10" DIY Subwoofer \| FE127E Sealed Bipole \| [ LM3886 Chip Amp / Gainclone \| K-12M Tube Amp Kit ]

21st December 2006, 11:49 AM	#9
plovati diyAudio Member Join Date: Mar 2005 Location: near Milan	Too Easy. Look at this home built triode. Yes You can try also at home. Look at this experiment done by a crazy Italian diyer in the del pentium1 75MHz ancient times (as He said). http://www.audiofaidate.it/forum/top...?TOPIC_ID=1797 __________________ Piergiorgio

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18th December 2006, 10:14 PM	#2
Fuling diyAudio Member Join Date: Aug 2001 Location: Sweden (Mora)	That´s the coolest stuff I´ve seen in a very long time!

18th December 2006, 11:10 PM	#3
Ed Holland diyAudio Member Join Date: Dec 2004 Location: Mountain View, California	Very neat! It reminds me of a few years ago, when I had do build an inexpensive rig to test display screen phosphors. A cheap ECC83 was cut open and used for an electron source (I tried filament bulbs but they were too fragile, and the light interfered with optical measurements). Cylindrical beam forming electrodes were made from sections of a drinks can. This directed electrons at a test screen held at B+. All parts were contained in the chamber of a high vacuum system. It was fun to see the phosphor glow as the system was powered up. It worked remarkably well, and we obtained some decent results! Ed

18th December 2006, 11:44 PM	#5
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	The one question .......... How did it perform ??? Excellent link, thank you! -Chris

19th December 2006, 12:22 AM	#6
emilesprenger diyAudio Member Join Date: Jun 2003 Location: Near the big cities	The triodes worked .. and sounded pretty good as well! Specs: mu = 10 Ri > 100K (!) The low S was probably due to large distances in tube and gas remains. You can read a review of ETF06 here: http://www.6moons.com/industryfeatures/etf06/etf.html

19th December 2006, 03:01 AM	#8
kopite diyAudio Member Join Date: May 2005 Location: NZ	Excellent and most interesting, thank you.

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