20 thoughts on “Giant vacuum tube

  1. Uhm, I hate to be a dick here but this was lame when I saw it on instructables. It doesn’t look like any of the real vacuum tubes I’ve ever used. the insides don’t look right at all. it’s missing the nipple on top, and it’s to fat. not to mention reposting stuff from other popular sites like instructables is lame unless it’s something cool like the gek powered Honda civic that runs on wood chips; that was worth posting here. I fully realize that saying these things makes me an asshole, but someone needs to call you guys on this crap or it’s just going to get worse, and quite frankly I almost gave up on this site alltogether until ian came along.

  2. @Steve

    Good, because we won’t miss you.

    Awesome work! I would use real carbon
    filaments and make them glow in red :P
    Making it vacuum is difficult, so
    NICE WORK! (again)

  3. Nice idea pingu :)
    How about this for an eco-unfriendly twist?
    Take the heating elements from a hairdryer or other electric heating device, stick 2 fans underneath the dome, 1 blowing in and 1 blowing out, adjust airflow for optimum glowage and bingo.
    Looks funky and warms the room :D

  4. @cap slockoff: i like the vacuum-tube-room-heater idea…
    granted, it would probably burn the house down; but it would still be worth it.

  5. I am somewhat taken aback that an Instructable with the succinct title “giant Fake Vacuum Tube” somehow made it to HAD as a “Giant Vacuum Tube” -no mention whatsoever that it is entirely ornamental.

  6. That’s pretty nice, goes along with my lamp ;)

    I might attempt the nixie tube ;) but I got a lot on my plate.

    Very nice!

  7. There are several well documented projects to make hobby built “Tubes” including more than one CRT. Many years ago there was a company building “Wire Ladder” electronic devices in glass tubes. I’m suspending flame comments on the repost as it’s well-intended even if edgy on hack cred level.

    IF for example the EL inverters had been crafted from disposable cameras and the “Tube” shell had been hobby shop vacuformed We’d likely be fanboy highfiving it..

  8. @ cap slackoff;

    I think just one fan would be better, seeing how it is a cylinder, make the fan an intake in the center, and then have the exhaust around the edges.

    It is “ok”, but it is an interesting idea, now to make a “circuit” using plastic glow wire and transistors hidden in the base to activate the fake tube and provide the function it should, would be a neat thing, maybe even make your room look like the inside of an old tube TV ;)

  9. @steve: Actually the outside shell is a dead ringer for lots of common late 40’s/early 50’s era octal base tubes, which tended to have their nipples hidden in the base and did tend to be short and fat. Inside, the biggest error is that all practical tubes completely surrounded the filament with grid and plate. That said, the flat presentation was commonly used, and is how the Type 30 in my homemade regenerative receiver is built, except that it has grid and plate on both sides of the filament.

  10. slockoff,

    I’d be careful if I built something like that and put it under a real vacuum. If you do it, have someone test it with a geiger counter to make sure it isn’t exposing you to x-ray radiation.

  11. @sam

    you’re a troll, right?
    -heating filaments producing x-rays
    -geiger counters detecting x-rays
    -vacuum blocking x-rays

  12. @localroger
    thank you for your constructive comment. I’ve never seen that type of tube but I usualy work with the 9-pin type and that does have filament is surounded by the grid and plate just like you said. I’m sorry for being an asshole but this isn’t a hack; art maybe, but not a hack.

  13. @trollfood
    Any vacuum tube might produce x-rays at ludicrous anode voltages (tens of kV). There was even a particular scandal with General Electric TVs: a failed rectifier supplied the regulator tube with lots of voltage and eventually someone noticed :)

    And yes, a typical contemporary “geiger counter” will be sensitive to x-rays. If “someone to test it” is an acquaintance from hospital, then it’s even more probable since those meters are specifically designed for x-rays. Of course one can stumble upon more specific counters for nuclear medicine, they might be gamma-only.

    Regarding that vacuum portion, I don’t think anybody understood. However I must remind that there won’t be x-rays *without* a decent vacuum.

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