lover and respectful of the old and venerable components, he revives reception tubes of 20s in making emitting it 3 watts on the band 80 m in telegraphy. qso across europe will be realized … see chapter qrp transmitter.

his reverence for the sir arthur collins’s equipment, lead him to restore a number of collins radios, and especially the 618-t.

and then, is it to participate in its own way to the centennial of the invention of the triode by lee de forest in 1906, he launch on the manufacture of the mythical tm developed by the general ferrié in 1915. making a lamp, it’s not so easy, but to getting things complicated with difficulty, f2fo will make everything he needs for this project, and especially various pumps, and a molecular one, to get vacuum allowing employment in emission of the made tubes.

a dozen lamps will thus see the light of day …

to check the measurements, a qso will be realized on january 1, 2005 on 80m in cw between montrouge, 92 and camaret, 29. the tubes are robust and will comme on contacts …

the original purpose, which was to cross the atlantic, was reched by f6bwo who has realize numerous qso on 4 continents.

the work

the work — amply illustrated — is composed of the following chapters:

tubes: history of vacuum tubes, from their emergence in 1906 until the advent of the transistor in 1960
qrp transmitter: realization of a transmitter using lamps from before 1925
triodes: making of a tm triode and necessary tools (pumps, oven …).
photos: some photos of making steps
mr mignet (pdf: 58 pages – 2 mb): original document describing the making of the “3-electrode vacuum tubes” by a pioneer in the twenties
additions of 6 october 2005 (not reproduced in pdf format)
review after one year of made triodes use (published in megahertz magazine #281 – august 2006)

the printable versions of the first four chapters in pdf format are available below:

the tubes (part 1) 72 pages – 68 mb
the tubes (part 2) 49 pages – 61 mb
qrp transmitter 41 pages – 5 mb
triodes (part 1) 36 pages – 31 mb
triodes (part 2) 25 pages – 15 mb
triodes (photos) 6 pages – 24 mb

if you want to know more, continue to scroll these pages. the text, photos and video are of the author f2fo.

the video

the mp4 video file is available below:

making of a triode tube 17 minutes – 125 mb

presentation: f9oe
transcript: f9hs

paillard dot claude at free dot fr
december 31, 2007

Seems things may be more simple than we think.

I mention this because of the Idea of creating the necessary tools to cut glass and spotweld. High amps low volts – :-)

I would also love to try to make a Homebrew spotwelder

M4CGYV3R; here stateside the old “Lejay maual” had instructions on building a spot welder, a reprint of the manual can bu purchasesd from Lindsay books http://www.lindsaybks.com/bks/lejay/index.html, by chance the illustration at the top left is the spot welder. Most of the projects in the lejay manual are quite dated, but can be upgraded to modern times.

The man must be France’s Dave Gingery.

Now my dream is to be like him in the future… but with transistors :-D

I wonder how hard would be to make an almost-hand-made transistor..

———-
Hahahaha sorry couldn’t help it.

In a few short days Hackaday has shown us everything from modding new hardware, someone pushing the edge of car aerodynamics and now this master!

2008 is going to be a great year if you can keep this up!

his first article for radio-ref (in 1959) is a bfo for the bc453 “command set” that attract attention for their remarkable selectivity.

he became the editor of “analyses de revues” (analysis of reviews), a column he held several years. he will be also a member of the board of the ref for 3 years.

he publishes, among other things: a linear amplifier equipped with 811, a oscillographic device allowing continuous monitoring of the modulation quality and also of the emitted signal purity, a tv camera equipped with integrated circuits and several ssb (“blu”) equipments including a transistorized transceiver which will be widely used in mobile.

(…)