the rubens tube?

I was just wondering is it possible to feel the sound waves that come out of the rubens tube on your skin without the fire?

Asked by Dominator57 7 years ago  |  last reply 7 years ago


Surgical Tubing? Answered

Does anyone know a place local (Target, Walmart, Home Depot) where I can buy this, or a water balloon slingshot? Please help and fast, I need this by tomorrow!

Asked by KnexFreak360 7 years ago  |  last reply 7 years ago


Threading a glass tube? Answered

Hello, I'm looking to make a prototype and I need to have a thick ( 1/8 of in) glass tube threaded at one end about a 1/4-1/2 in. up so I can screw on a cap. How would I go about getting that done or have one custom made for me? Can anyone help?

Asked by haz630 5 years ago  |  last reply 5 years ago


Metric Tube Supplier?

Does anyone know of any good steel tubing suppliers. I need a few different sizes, all of which cannot be found at any local hardware store, in square and rectangular shapes. Also, I found one supplier already and they had so many sizes to choose from. But they only ship large quanities to companies, not to the individual. So if anyone knows of any suppliers that can supply the following sizes for a decent price, your help would be very much appreciated. The sizes I need are 40mm square with 2.5mm wall, 25.4mm square with 2.5mm wall, 20mm square with 2mm wall, 40X20mm with 2mm wall, 35X16mm with 1.5mm wall.

Asked by bombmaker2 8 years ago  |  last reply 2 years ago


VACUUM TUBE OP-AMP USING LOW VOLTAGE TUBES?

I would like to build a low voltage op-amp circuit for an analog computer. Can it be done ? I would like to use tubes in the 12 volt range. The idea is to construct an analog computer like the Heathkit EC-1, but using low voltage tubes for the op-amps. The EC-1 is very expensive, and hard to find on Ebay etc. Any ideas? Thanking you in advance, Wayne Verish

Asked by gort59.5 9 years ago  |  last reply 9 years ago


how to make homemade tube bender?

How to make homemade tube bender, for 1" tube?

Asked by fietser 7 years ago  |  last reply 7 years ago



DIY tube and pipe roller

Anyone able to make a guide on how to create a DIY tube and pipe roller? Roller's is not the same as benders, benders make sharp bends while rollers make adjustable gradual long archs. Should be able to bend atleast 2" tubing and pipes. Best regards Tom

Posted by randomher0 9 years ago  |  last reply 6 years ago


Optimum dimensions of a Rubens Tube? Answered

There are several Instructables posted for Rubens Tubes, and I have seen a few elsewhere. I'd like to make one myself, for demonstration purposes, but I'm wondering if there is an optimum set of dimensions? I have seen diameters from about 2-10cm, and lengths from about 80cm to 2m. And what diameter holes should I drill? If it makes a difference, I'll be fuelling it with mains natural gas (methane) in a school lab. (And, while I'm here, what would be a good rescued speaker to drive it?  An old PC speaker?)

Asked by Kiteman 8 years ago  |  last reply 8 years ago


How to straighten copper tubing? Answered

I'm making an air "cannon", but my tubing is bent. It is 3/8 copper tubing, and is very bendy. Is there a way to get it straight, or am I better off buying a small steel tube? (I did try googling this, with no helpful results)

Asked by Bartboy 9 years ago  |  last reply 9 years ago


diy hamster tubes anyone?

I realy want to make hamster tubes for my hamy but i cant find good ones for a good price. O and i dont want the instructible by hazard. THANKS ! : P

Asked by hungyhipo 2 9 years ago  |  last reply 3 years ago


air tube fitting (seal)

Greetings, I need to pass an air tube (1/8 or 1/4") through a plastic soda bottle (or milk jug) and need to seal the penetration point with some type of rubber gasket -- that the air tube will pass through the center. note: been looking all day. I think I might not be searching on the correct word. I've seen these silly things, but can't seem to locate one today. They are like little rubber donuts with a slit around the center (for wall of jug)

Posted by jwells 10 years ago  |  last reply 10 years ago


fake nixie tube clock

I was wondering is I could use the same system of using a 7 segment display to wire up a digital clock using el wire since nixie tubes are so much more expensive and limited to small size, or if i should wire it so that it is like a singular l.e.d.  and where could i get smaller metal chicken wire fencing to further increase the nixie tube effect. Sorry for the bad grammar when I get an idea I tend to lack the proper way to describe it even though I can see it plain as day in my head

Posted by general-Insano 8 years ago  |  last reply 6 years ago


Vortex cooling / heating tubes

I am currently gathering information about vortex tubes for my repulsine project. There are plenty to choose from on a commercial base but I struggle to find any technical drawings with proper dimensions. Several home made varities can be found as well but wither with poor performance or incomplete drawings. So I was thinking that someone here either uses a commercial product at home or work and might be able to take some basic measurements for me? I am most interested in the relation between inner tube diameter and lenght for the hot and cold ends as well as the size for the vortex chamber itself. If there is an orifice used on the cold end the hole diameter would be required as well. My aim is, based on a properly working original, to create a device that might be less efficient but can be used without a compressor. Would like to see, correct transfer of dimensions given, a vortex tube like system was used in the repulsine. Some old documents state that there was a "seperator" which removed "heavy air particles" and created a temperature differencial between top cone of the repulsine and the wave disks.

Asked by Downunder35m 3 years ago  |  last reply 3 years ago


Nixie tube clocks for sale?

My friend and I are trying to make money by making and selling things. I think that nixie tube clocks would be a good thing to make and sell, because the retro look makes them very popular and sellable. If we were to sell them though, we would need to know several things. Would it be better to sell them fully assembled or in kits (or possibly both). What about enclosures? I am thinking a nice wood box would go with the retro look nicely. What is the best tube to use? I'm thinking the IN-12 or the IN-4. I'm thinking, taking into account what I estimate the total costs for materials would be, we would need to sell them for a price in the vicinity of $70. Does that sound reasonable? Lastly, how should we sell them? We could use ebay, though I don't know a whole lot about the process to becoming an ebay seller, we could use craig's list, but that seems to be more local, or we could have potential buyers email us, send payment and then we send the product (but nobody seems to trust anyone these days so I'm not sure that would work). Please tell me your opinions on these things. Thanks.

Asked by Higgs Boson 6 years ago  |  last reply 6 years ago


Glass Tube Alien Thing

Just a thought, but what if you combined this with this and this. I was surfing the internet, and found the "glow crystals", then thought about the instructable on the "mad scientist's light",and wondered about combining them. Later, I read the action figure instructable, and thought that it would be a great addition. I don't have the materials or skills to do that, but I was wondering if someone else was. (maybe make an instructable, and credit me) It would be like a glowing alien experiment from DOOM!!

Posted by John Smith 11 years ago  |  last reply 11 years ago


the evil of you tube

Gah look how much cpu and net traffic uploadig a vid on the tube makes! help

Posted by maker12 10 years ago  |  last reply 10 years ago


what is a nixie tube?? Answered

How many volts do they take?? can you please tell me of great nixie tube instructables.

Asked by tzq33tdq 8 years ago  |  last reply 8 years ago


is it able to make rubens tube with LPG gas?

Asked by shahrukh shajahan 7 years ago  |  last reply 7 years ago


Where to get a vacume tube necklace? Answered

I want to make a necklace#

Asked by nerd7473 6 years ago  |  last reply 6 years ago


Can I replace vacuum tube 6dj8 with 6BZ7? Answered

Asked by jbaker22 6 years ago  |  last reply 6 years ago


Building a Stereo Tube Amp

I'm in the UK and interested in Building a Stereo Tube Amp (by thobson in audio). Can anyone advise on the UK equivalents for many of the components used in this project e.g. transformers, valves (tubes) and where to buy them? Many thanks.

Posted by DonaldStott 1 year ago


Tube headphone amp

I want to build a tube headphone amp. Is it possible to make a smps (switch mode power suply) to power it? It would be like a mix between old and new technology!

Posted by dwj300 10 years ago  |  last reply 10 years ago


Help Identifying A VERY Old Vacumm Tube?

I recently got a 1920's RCA Radiola 60 Tube Radio , and when I was servicing it I kinda accidently dropped a tube and the vaccumm seal broke and the glass broke. on the side of the tube it says "Philco H 5" it has four pins two bigger two smaller. Here are some pictures of it for reference.

Posted by jackillac92 10 years ago  |  last reply 10 years ago



Can i wire up a tube from an old radio just for the glow?

I found a 6BQ5 amp tube and know nothing about them other than the pin id's.

Asked by Capt. Howdy 9 years ago  |  last reply 9 years ago


Tube radio not tuning, only making a hum

I have an old, Light green GE tube radio, AM only, and when I turn it on it only hums, it doesn't receive any stations, How can I fix this

Asked by macwhiz 6 years ago


Coloured tubes of plastic we swung round our heads?

Do you remember those tubes of coloured plastic we used to swing around our heads and they made an awesome sound? What are they called and where can i buy one now?

Asked by 9 years ago  |  last reply 9 years ago


I need help identifying a tube

I pulled it out of a channel selector on an ancient tv, and i cant find anything on the internet about it, its short and fat with 9 pins, Written on it is the general electric symbol, followed by electronic tube, the only thing i can find on it that may be indentification is 18c-5, if it helps it was in there with an 6hq5 tube. If you could tell me what this is i would be grateful

Asked by fatfoohy 9 years ago  |  last reply 9 years ago


How can i make wrist watch with using nixie tube?

How can i make wrist watch with using nixie tube? Can you tell me what am i need  ? Parts and schematics? And how much costs? Thank you .

Posted by DarkPlace 6 years ago  |  last reply 6 years ago



Awesome, fun ideas to use my brass tubing? Answered

Hi I was going to make a steam engine so i brought some brass tube and tried to join the local metalworking club so i would have access to their knowledge and tools as i have none myself. The committee of this club are having issues and not accepting new members for 12months which disappointed so i have brass tube 1/2in 0.14mm it says on the sticker and I'm kinda impatient so i wondered if you guys had ideas of what i could do. 2 tubes about 25cm long. I've been thinking about what to do when my town is invaded (the street lights are off every other week and reports of shady characters near power station lately) A self defense tool, survival tool? Usually I'm creative but people having holidays at work mean i work 10hours a day 6 in morning 5 in evening. It drains you split shifts as you see in my maths fail. Anyway, i appreciate your ideas. Thank you

Asked by Scotty3000 8 years ago  |  last reply 8 years ago


How do I get past firewall to get to youtube?

My parents got really mad and blocked youtube and I feel like all my knowledge comes from there what should I do?

Asked by harrywatts16 5 years ago  |  last reply 5 years ago


I Need help wiring up a 4 pole 3 way rotary switch!!!!!!!!!!!!!!!!!!

I bought an amp kit but it only has one input source, I want three so I bought a 4P3T switch but I can't figure how to wire it up correctly HELP !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Asked by LASOUND 9 years ago


"Organ donors"... or: sources for tube project parts...

The "Vacuum Tube" group needs a first forum topic. Here it is... Sorry 'bout the pun... but I could have used Time to get Organized... Be thankful ;-)Vacuum tubes and parts tend to be rather expensive these days. But there's a good source for parts, and it's often free: old tube organs.I picked up a working 1960 Wurlitzer a couple days ago. It's got:-- full complement of tubes (the mother lode!), including9 (nine!) 12AX7 preamp tubes.2 6L6-GC power tubes1 5U4-GB rectifier(there were other tubes: (28!) 12fq8's but they're not so useful for audio...)-- Huge power transformer-- Large (20-25 watt) output tranformer-- two 16 ohm speakers-- lots of carbon-comp resistors, sockets and other reusables.Total cost--just gas, and a sore back.Even the non-tube organs are a good source of speakers, reverb tanks, pedals, etc. The tank, bass pedals and the volume pedal were from a solid-state Conn organ left on the curb...The bass pedals could be made into a MIDI project, and the volume pedal would be a nice start of a wah, or left as-is. Yeah, they are grungy, but that's easy to fix....

Posted by gmoon 10 years ago  |  last reply 10 years ago


where to find thin wall plastic tube?

Hi, I'm building a wind tunnel, and want to achieve a more laminar flow. I've tried drinking straws but they seem to stop the air flow too much. So I made a much larger bore honeycomb with toilet roll tubes. That worked a lot better, so now I'm after something a little better looking. Does anyone have any ideas for where to source a few meters of thin wall plastic tubing? About 25mm -> 35mm diameter. Transparent would be ideal. Thanks!

Asked by matthewvenn 8 years ago  |  last reply 8 years ago


Where to buy large glass tubes?

I need several glass tubes (10-20) that are around 30-40mm in diameter and 6 feet long. They also can't be rediculously expensive, I've been searching for a while, but all I've been able to find is glass with a length of 4 feet and a diameter of like 10mm. Any help?

Posted by guyfrom7up 9 years ago  |  last reply 9 years ago


What to do with old vacuum tubes?

I recently found a really old tv in a crawlspace at work and I brought it home and salvaged 13 vacuum tubes out of it. I figured I could make some sort of cool project out of them like maybe a mad scientist lamp with LEDs or something. But before I actually start using them I wanted to brainstorm some more ideas of possible projects. So if anybody has any good ideas of cool things to do with vacuum tubes, let me know. Also, just out of a nerdy curiosity I was wondering what exactly vacuum tubes are designed to do, does anyone know?

Posted by cannedham160 9 years ago  |  last reply 4 months ago


Ge AM tube radio-Only hums won't tune?

I have a GE tube radio that I got at a yard sale, but it only hums when turned on, it won't tune to a station

Asked by macwhiz 6 years ago  |  last reply 2 years ago


Are tube type amps really better than solid state type amps? Answered

A question below reminded me of this. My friend and neighbor plays a guitar and has been going on about how great his new Fender tube amp is and how much better it sounds than the solid state amp he previously used. Truthfully, I've listened to him play on both (he's no Chet Atkins for sure) and I can't discern much, if any difference. I've done a little research and heard words like, "warmer,"  "more vibrant" and "louder" used to describe the difference. With the exception of louder, most of these descriptions are not actually measurable. Is there a way to definitively say tubes are better, or is it just a subjective quality that depends upon the ear of the listener?

Asked by Burf 8 years ago  |  last reply 5 years ago


Reduce steel tube diameter by 0.3mm Answered

I am trying to make a DIY CNC machine, using linear rails and the expert advice in the many awesome instructables out there on this topic.  I hit my first roadblock, and I need some help/advice please... The 16mm steel tubes I ordered for the sliding rails wouldn't fit in the 16mm linear slide bearings SCS16LUU that I ordered, they are ever so slightly too big. With a lot of force I could get the rail in the bearing, but it wouldn't slide without extreme force - certainly not the smooth sliding motion it's supposed to be! I've probably ruined the bearings by forcing it in, but I'm not worried about that so much right now (I have spare bearings). I broke out the digital callipers, and the rail diameter measured 16.3mm - that's .3mm more than expected, and more than can fit in the 16.0mm bearings. So now I need to reduce the steel rails by 0.3mm. I have only hand tools at my disposal, and no experience accurately reducing steel rod diameter. I guess another alternative is increasing the slide bearing diameter, but these are sealed bearing units and difficult to get at. Does anyone have any ideas ?  Would it be easier to order new steel? Please let me know any thoughts on this, I'm desperate here.  Thanks in advance,

Asked by srah1 4 years ago  |  last reply 4 years ago


How to clean stinking kitchen tubes?

Get chemicals from supermarket, pour it into the basin, pour hot water, clean everything with acid, or? I'm looking a green way to clean the basin, the tubes are open but there is a smell coming up from the tubes. edit:as an answer to bleach I'll recite from grist.org:"The corrosive ingredients in these products can severely irritate eyes, skin, and the respiratory tract, and can be fatal if swallowed. Chemical drain cleaners are among the most dangerous of all cleaning products, containing sodium hydroxide and sodium hypochlorite (bleach) that can permanently burn eyes and skin. In oven cleaners, lye and sodium hydroxide can burn skin, eyes, and the respiratory tract."the p-trap in the kitchen is made of metal, anyway I guess it can be removed and cleaned manually which seems like the best way. the air valve in the kitchen is the yellow one, so I think it's not the water that blocks the air blow.I don't think I have a disposal ( is it the machine with knifes under the sink? i don't have that one)but I'll try to pour a some lemon juice, too.I think the enzyme cleanser is this one:http://www.thisthatotherthings.com/bacoutfoamer.html?productid=bacoutfoamer&channelid;=FROOGbut I live in Italy, so I'll try to find another one at least in Europe.as I live in an apartment, I can't clean more than the pipes under the sink, not to mention to change them.other solutions I've found are: *Pour down half a cup of sodium bicarbonate (or baking soda or sodium carbonate) and half a cup of vinegar, wait 15 minutes, pour down 1 lt. boiling water. I translated it from another language and there is a confusion here about sodium bicarbonate, baking soda and sodium carbonate, I didn't get which one to use.this works for opening blocked drains or the toilet. BAKING SODA IRRITATES YOUR SKIN, USE GLOVES. it makes a chemical reaction and you should be careful when it boils. but the ingredients are harmless to nature.to disinfect:*Mix 2 spoons of borax, 1 cup of vinegar and 500ml hot water, use it for toilet, and similar surfaces.I don't know how/where to find borax (water+O2+sodium+bor) but this solution might help for the smell.

Asked by iovsjupiter 9 years ago  |  last reply 6 years ago


I have a long cardboard tube and want to make a gun-like thing. is there a halo gun or something i can make?

I just want a gun to make or something cool. thx

Asked by OzTheGreatAndPwerful 6 years ago  |  last reply 6 years ago


Can anyone tell me step by step instruction on how to convert an old phonograph tube amp to a guitar amp.

Can anyone tell me step by step instruction on how to convert an old phonograph tube amp to a guitar amp. It has a 6bq5 power tube 6X4 rectifier tube, and a 12aX7 pre tube. Can anybody please tell me how to do this. You would be so appreciated. I have soldering skills, but not too much electrical knowledge. I know what resisters are, I know what transformers are, I know what capacitors are, and I know the very basics of their functions, but I can't understand how to tear it down and make it a good guitar amp. I want to remove the feedback circuit so that it will distort naturally. I would also like to modify the equalization and tone to better suit guitar amp. Please help. You would make me so happy. I cant afford to buy a good tube amp, and this is my only hope of making a great sounding amp. Thanks so much. Please be as detailed as posible in these step by step directions. You are awesome if you can help me.? Thanks The amp is from a 1959 Newcomb model R124V phonograph with an inboard 6"X9" speaker. It works perfectly with no crackling knobs or nothing like that. The amp is super clean and well cared for The tubes inside are 6BQ5 FROM AMPEREX BUGLE BOY. The rectifier tube is 6X4 from sylvania, made in USA. The 12AX7 is made in Britain, but I can't see a name on it. I have many spare 12ax7's lying around though. Thanks so much in advance.

Asked by meman-mark 7 years ago  |  last reply 7 years ago


Vacuum Tube Chess Set

This chess set made from vacuum tubes is pretty stunning. Plug a tube into a square and the top lights up. I doubt that the pins will stand up to very many games of chess, but it is lovely to look at. Vaccum Tube Chess Set via Make

Posted by fungus amungus 9 years ago  |  last reply 9 years ago


where do you get a 6mm steel tube?

I was wondering where you could buy a 6mm steel tube for the 6mm mini cannon.

Asked by coatofarmsxl 5 years ago


has anyone built a pneumatic tube system

Hello, has anyone built a pneumatic tube system? Or anyone have ideas on how to build one and the materials needed? thanks

Posted by gregdove 9 years ago  |  last reply 9 years ago


Could I use a 12AX7 tube in the ValveLitTzer instead of a 12FQ8?

Would a 12AX7 tube be suitable for use in the ValveLiTzer instead of a 12FQ8 because I am unable to get the latter?

Asked by 22bsti 9 years ago  |  last reply 9 years ago


Tube amplifier schematic

Does anyone have a schematic for a stereo tube amplifier, I just acquired a large quantity of tubes, a tube tester and some other assorted electronics from my grandfather. Ive always wanted to make a nice tube amp, now all i need is direction. It will be another 2 weeks or so before I can actually pick them up and start testing them so I was just trying to find some schematics to get me in the right direction. I figure this may even make a nice first instructable as long as im not completely lost in the schematic. Thanks smoke

Posted by smoke 11 years ago  |  last reply 11 years ago


how can I make a vacuum tube necklace? Answered

I want to know so I can make one and where do i get one.

Asked by nerd7473 6 years ago  |  last reply 6 years ago