Eigenbau Kathodenstrahlröhre - homemade crt tube

[FerorBlackthorne]

o0 ist das nicht eine Kanalstrahlröhre wegen dem loch ??

[1marcelfilms]

connect it to the tv coil's

[kleindamv]

der erste tv :)

[SilvianoJ]

"crt tube" is redundant because the "T" in crt stands for tube. That's like saying "ATM machine"

[JeweledBeast]

@SilvianoJ people say ATM machine all the time.

[TheCentralServices]

Cool! What is the Leuchtschicht made of?

[23565120]

It must have required much work to make this tube. Well done !

I see the 'Elf and safety squad are trying to spoil it all. You will get no appreciable Xrays at voltages below 20Kv.I've spent nearly 50 years working with C.R.T.s, both in and out of housings, and still no cancers etc. EHT rectifier valves give more Xrays, and people dont seem to realise this. Their radiation is wider spread too.

[fujitsulifebooke342]

Good job that my TV isn't that noisy!

[LectronCircuits]

Wie, wunderbar! Ich liebe es. Beifallsrufe!

[yetzt1]

Schön gebaut, Grüße von der Lernwerkstatt für Naturwissenschaft und Technik aus Berlin.

Alle sind herzlich eingeladen, unsere Einrichtung kennenzulernen und bei uns eigene Sachen zu bauen

sucht uns im Internet unter Lernwerkstatt frecher Spatz eV.

[cb321o]

X-Ray x-Ray dingelingeling alle atzen sing!!! Nice work!!!

[iggy151]

Nice work :)

[zaphodb777]

No X-rays till you hit 16 kilo-volts onto a dense (nickle alloy) target. He's running 1/4 of that according to the video. Absolutely safe... well, radiation wise.

[drMerkwuerdigliebe]

@zaphodb777 Why? you do get x-rays if you shoot 4keV-"fast" electrons at metal:. The frequency of the Bremsstrahlung would be up to about 10^18 Hz according to my calc. Bad news - thats definitely x-ray-rad

[zaphodb777]

@drMerkwuerdigliebe You're right, my bad. But knowing glass blocks UV and other semi-hard photons (up to a certain point), would sub 16 keV photons be able to escape?

Perchance he used leaded glass too, as in commercial CRTs? My monitor is currently running at 32KV (1600X1200), I have seen some other CRTs running at up to 50KV (projection). High voltages in some hi res CRTs is needed to maintain beam focus at high sweep rates. Of course, there's an inch of heavily leaded glass in my monitor.

[drMerkwuerdigliebe]

@zaphodb777 what concerns me most is that selfmade electron gun. A x-ray-tube is a tube where the anode is a peace of dence metal that "catches" all the elecrons producing heat and well: x-rays.

a ideal electron gun is one where the elecrons go through the elecrical field and accelerate but miss the anode and are emitted. The ideal process cant be made but: Now: if I understand this construction here right: this is something in between. The anode is a copper-plate with a hole in it???

[drMerkwuerdigliebe]

....(2) so if Im right here: pretty many of those accelerated electrons hit the metal. Are slown down - emitt rays which have the photon-energy of about the kinetic energy they had: 4keV - are therefore up to 10^18Mhz in frequency: x-rays - and this radiation is nowhere blocked by metal upward and downward!?

Maybe Im wrong but that is my concern. And therefore Im not so sure about this experiment here to be healthy.

[hardstyle905]

@drMerkwuerdigliebe lol there are no x-rays at 6kV

[drMerkwuerdigliebe]

@hardstyle905 why? How much photon energy do you think x-rays have?

[hardstyle905]

@drMerkwuerdigliebe why not build this and use a geiger counter? i HIGHLY doubt it will detect anything at 6kV. and the glass is too thick for them to make it outside

[hardstyle905]

@drMerkwuerdigliebe btw, this guy (XtrBass) is doing PROPER x-ray experiments. I doubt he cares about this tiny thing generating a TINY amount of x-rays lol

[drMerkwuerdigliebe]

@hardstyle905 I didnt say that he is as good as dead already. But I dont think this kind of experimentation is recommended for anybody. I dont know the power ie. Nor the transmission coeficient of this type of glas at the frequ. Nor the width of the glass.

Is there x-ray rad at only a several keV: yes. Does it kill you instantly: no. Is it healthy use it all the time for something and put it on your desk: I dont know. Thats all.

[masadification]

omg! so epic.

[masadification]

@masadification the radiation is not so epic though... he should get some lead shielding for that.

[DanielSiegele]

Ich möchte kein Spielverderber sein, aber stark beschleunigte und dann plötzlich abgebremste Elektronen erzeugen in jedem Fall Röntgenstrahlen - nicht nur aus einer Metallannode.

[TheInfoset]

@DanielSiegele  da geb ich dir recht !

[t00m1008]

Was auch immer es ist, es sieht iwie geil aus :-D

[Nanobot02]

that cant be healthy^^

[gschjetne]

@Nanobot02 When I was a kid we watched TV on cathode ray tubes. And it was uphill both ways!

[themainproblem]

Very cool! Thanks for sharing.

[Jannick746]

naja mach ma so weiter und spiel mit einer röhre rum dann biste ja bald vollkommen verstrahlt

[MrThomassss]

bau daraus ma ein kleines röntgengerät wäre echt cool

[7MusicBoy]

echt cool

[feisch1]

erstaunlich wie einfach eine elecktronenkanone gebaut werden kann gute arbeit

[zker666]

isn't that generating alot of xrays?

[Minifig666]

@zker666 I'd say, yes... Alot!

[jeabo0adhd]

That's sweet!

[PHRASERPHRASER]

how much volts it uses to work(the crt)?

[TheBikebrothers]

Ensteht denn da keine gefährliche Röntgenstrahlung? Da ist doch nix abgeschirmt?!

[feisch1]

röntgenstrahlen endstehen nur wenn ein elecktronenstrahl auf eine metallanode trifft

[HighVoltageFag]

um...X ray hazard?

[ipullstuffapart]

this is actually like a crt tv screen harmless

[scorpionkik2008]

Very cool!!!!! You use only a mechanical pump or also another type ? (Difusion pump?).

[marsimoto999]

cool

[fraxisc0]

you should bring this to the screen fosforo Bakan

[kathodenstrahl45]

wo hast n die leuchtschicht her? Is geilo!!!

[OLTCITKA]

GENIUS!! Thanks a lot for posting video! This was very interesting to watch.Congratulations for owing all those cool equipment.They are old but so good... :D

[voon100]

Very cool video. All these setup for a bright beam.

[Zuberharl30]

Geiles ding

[ceeshat]

ehrlich

[mbrandhu]

Cool, will ich auch machen :D

[douro20]

I'd like to see more being done with cold-cathode CRTs

[qwertzuioplkjhgfd]

extrem geil! noch 2000 halbleiter und du hast ne fernseher^^ echt geil das ding!

[kathodenstrahl45]

Bau mal aus einem Trinkglas eine Kathodenstrahlröhre, wenn es das Vakuum aushält! Sicher geil!!!

[kathodenstrahl45]

Wie haste die Leuchtschicht dareingekriegt?

[kathodenstrahl45]

Geile Sache!

[FesixGermany]

Mal wieder was tolles von dir! Wie wärs, wenn du dir daraus ein mini-oszi baust? Wär doch mal der Hamma!