Cardboard Tubes

What can I do with cardboard tubes? Anybody have ideas? I'm focusing on different ways to strengthen the tubes and angling them for a project and need a little bit of help brainstorming

Topic by wesasaur   |  last reply


Cardboard tubes

I have a basically unlimited supply of cardboard tubes measuring approximately 63" in length, 2 5/16" in diameter, and 3/16" thick. If I put these up for sale do you think anybody would be interested in buying them? They are very strong and durable, and would be GREAT for many different type of crafts and projects. 

Topic by Lord Sinroyal   |  last reply


Vacuum Tubes

What kind of vacuum tubes are these? What can they be used for, etc? I found them from an 80's TV.

Topic by tinstructable   |  last reply


SS tubing

Where can I buy Screaming Serpent Tubing? Knex.com doesn't sell it anymore.Please help.

Topic by knexpert#10829476   |  last reply


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?

Question by Dominator57   |  last reply


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!

Question by KnexFreak360   |  last reply


Cardboard Tube

My brother has a large cardboard tube that is 14ft long with an 8 in. diameter. Any ideas on what to do with it? He also has a lot a cardboard boxes, and several rolls of duct tape, and enjoys making models of World War II things.

Topic by waldotheawesome   |  last reply


Cardboard Tube

My brother has a large cardboard tube that is 14ft long with an 8 in. diameter. Any ideas on what to do with it? He also has a lot a cardboard boxes, and several rolls of duct tape, and enjoys making models of World War II things.

Topic by waldotheawesome   |  last reply


Tube Material

I started thinking about how the tube material could be improved. Although I love the ghetto look of pringles wrapped in the invincible duct tape, improvements can be made. You could use PVC or ABS for the tube, it wouldnt need pressure rating because Im sure this thing wouldnt have enough power to explode the pringles/tape team. This is rather cheap and you could just glue on an endcap. Then a BBQ ignitor can be threaded in, a ring to define the chamber and barrel and fuel sprayed in! However getting the perfect cost/durability/strength ratio is hard.

Topic by SNDM 


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

Question by hungyhipo 2   |  last reply


Where do I find color changing LED tubes?

Hi all, I'm after a modular/customisable LED tube/other interesting window display lighting options. This is mainly for window display/events. See image below. https://s-media-cache-ak0.pinimg.com/564x/38/f0/6d/38f06d24771b28713e8f1434538be0b3.jpg

Topic by jarris   |  last reply


Does anybody here know where I can find data on vacuum tube manufacture? I know about the Frechman who makes his own.

The problem I am having is that certain tubes- say a 12AT7- have certain dimensions for the plates, cathode and other parts. Would any one here know where to get enough data to make this tube and others so the results are that of an electrically equivalent tube? I am looking for the shop or " mechanical" drawings for common tubes of the 50's all the way to the late Compactrons.

Question by Tubetech762 


does any 1 have any ideas for these objects?

I was makeing some speakers and the cut i was doing turned out wrong so i managed to adjust the cut and came out with these funky shapes i dont really want to make speaker tubes out of them.. iv got glass, coloured strip lights, led`s,strobe, mirror ball motor,wood,and speakers but you know that already there 315mm dia x 2foot... twist 1`s are abit longer

Question by andybuda   |  last reply


Nixie tube suplier?

I need to find a supplier for nixie tubes, I've found some online but im not sure about them. has any one ever ordered some. I'd like to avoid using ebay. I'm trying to get some for a watch so small=good.

Question by the_doctor   |  last reply


Cardboard Tubes For Sale

I have a basically unlimited supply of cardboard tubes measuring approximately 63" in length, 2 5/16" in diameter, and 3/16" thick. They are very strong and durable, and would be GREAT for many different types of crafts and projects. I'm honestly not sure what to charge for them, so if you're interested please tell me how many you want and your asking price. 

Topic by Lord Sinroyal 



the evil of you tube

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

Topic by maker12   |  last reply


what is a nixie tube?? Answered

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

Question by tzq33tdq   |  last reply


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!

Topic by dwj300   |  last reply


Vintage Vacuum Tube? Answered

I have a vacuum tube from my collection here that I would like to test. It says on the box International, Electronic tube, GTE, Sylvania, And what appears to be 12Z - the last letter or number I don't know its either a 1 or a capital i, 12Z - I or 12Z - 1. It has 12 pins, 3 of which are not connected to anything, I can see that visually. Any help would be appreciated.

Question by Electric Spectre1   |  last reply


Projector length of tube? Answered

I was curious if it's possibly to extend a projected image, from a projector (like tv/computer) down about a foot of tube. Tube would be 1 - 2 inches wide. If this isn't possibly what would be the smallest width the tube would have to be for it able to go down a foot of length?

Question by ebodenberg   |  last reply


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

Topic by smoke   |  last reply


Telescope with 3 tubes

Hello all, I wish to make a telescope with a long (1 metre) cardboard tube I got with a potrait I bought a few days ago. I already have 3 smaller tubes - 2 from silver foil rolls (which are very thin in diameter - about an inch), and another from a soldering iron (which goes inside the big tube easily). Is it possible that I make a telescope using three tubes (one sliding inside the other) and three lenses? If yes, how and what lenses I need to use? Regards

Topic by rseni 


Valve/Tube Amps

Hi, I am currently designing a stereo/mp3 amp for my education and I was wondering... Is it possible to incorporate a Valve/tube into a conventional stereo circuit? (like a standard valve amp but smaller and without the Equalization effects) I suppose the Valve/tube watts would have to match the speakers, but is this possible or would I have to use a circuit from a guitar amp that is already paired with a valve/tube amp system?! Much appreciated. -Rob

Topic by RobertChallingsworth 


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?

Question by haz630   |  last reply


Technology of the Tube Screamer

Some time a circuit Screams wrong as this foot switch flipflop I can see the arrangement if the design wanted independent control but that would allow a lack of signal.

Topic by iceng   |  last reply


bass tube overdrive?

I would like to build a simple valve overdrive, will the valvelitzer do or will it need some mods?NO FUZZ plz, im looking for a nice warm creamy valve overdrive.gmoon can you help a clueless lad like me?

Question by wynand van reenen   |  last reply


What to do with these tubes?

I have 28 of these cardboard tubes. They measure 6.5 inches in diameter and 42 inches long. Company I work for was throwing them away. Seems like I could do something creative with them. Please give me some suggestions.

Topic by starpox   |  last reply


Rubens tube help!

Hey everybody, Ok so me and my friend built a rubens tube for our science project and fired ot up today. It was awesome! But, we have one problem. the flames keep getting blown out or are dying and we dont know why. Our tube is about 4 or 5 feet long and has holes every half inch (1/16th drill bit). we used latex sheets on both ends. the propane is a camping tank (small) and feeds the rubens tube through 2x 1/4 inch feeds spaced evenly apart. It may just be that we need to let the tube pressurize more. Our tube is 4 inches in diameter and is about 5 feet long. We let it pressurize for about 5 minutes. I think maybe somewhere along the lines of 7 minutes might do the trick, because when we went to light it, the initial flame height was very short. Has anyone else used the same setup we have?

Topic by ir0n_ma1den   |  last reply


vacuum tube television Answered

ive got an old working color vacuum tube tv, a Motorola quasar portable. im wondering if its worth any money or if i should just go ahead tear it open, and feast on its delicious inners it works fairly well with no discernible problems that i know of. i took a look inside and dident see any silicone. do people collect these or anything?

Question by The 4th Doctor   |  last reply


Tube Amp tips?

Lately I've been pondering building a tube amp for my electric guitar, and I'm wondering if anyone has tips on component selection/could recommend some resources for me, since I'm not exactly an audio expert.  I'm considering something in the way of a half-stack, any ideas on what the cost would be of building that, and what kind of wattage I could get without breaking the bank?

Question by RelaxedSoup   |  last reply


Inner Tube 700x45

Can i fit a 700x28-35 inner tube on a 700x45 tyre. my common sense says no its first tyre ive needed to change tho so i went halfords got told a 700x45 sounds more like a motor bike tyre and was sold 700x 28-35.  just checking before open them and cant get a refund.

Topic by adonoghue   |  last reply


Vortex Tube expansion

So, i'd like to take the idea of a vortex tube and make it larger.  much much larger.  If i were to use a 3-4 inch pipe, how long would it have to be, and would i be able to supply it with a high power blower (centrifugal), or would i have to find some way to provide 80-120psi at a huge volume? i leave my question to the community!

Question by kretzlord   |  last reply


Flourescent Tube Driver?

So, I'm working on a coilgun, and I don't want to use camera flash circuits to charge the capacitors. Anyway, I've recently come across this, and was wondering if anyone knew what voltage it put out, and current, and stuff like that. Also, if anyone knows an alternate way of charging capacitors to a voltage of 100v - 400v, please share (after all, sharing is caring). Ciao.

Question by LiquidLightning   |  last reply


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.

Question by bombmaker2   |  last reply


SST plasma tube

I am in the process of creating a plasma tube, similar to those globes but made from an acrylic tube of about 80cm lenght. In my small scale experimets with a glass bottle instead of the tube I was able to find a way to mix some Argon gas into the vacuum to create the type of plama arc I want. Problem is the HV part for the much longer tube and how to keep the input voltage at 12v to be electrically save. To drive the switching part of the HV section a simple quare wave generator with adjustable frequency and pulse width is used. In my current design I use 5V for the driver and 12V for a TIP122 that drives a modified flyback transformer directly. Now to specify my problem: The TIP is good for 100V and up to 5A with proper cooling. But I would need to make a new HV coil capable of delivering around 80kV at 12-30kHz - that is the easy but time consuming part. The primary side would have quite some inductance and I fear the TIP122 would soon get into trouble. So I was thinking of using a IRF260 mosfet instead but they need a proper gate driver for high and accurate switching speeds. To further seperate the driver from the hot action I thought of using a LED on the driver side connected by a fibre optics cable to the Mosfet driver. Would it be feasable to use good a transistor to drive the gate of the Mosfet directly or is a gate transformer the better option? Are there any shematics available for a gate driver that uses an optical input? And yes, of course I will make an Instructable if I ever get it all working to my satisfaction.

Topic by Downunder35m 


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?

Topic by cannedham160   |  last reply


What should I do with these cardboard tubes??

Greetings!    I have approximately 100 of these cardboard tubes from pallet wrap that I've been bringing home over the past few years from work.  I've been intending to do something innovative w/ them, but I've not been able to come up with an idea that will put a lot of them to good use!    Does anyone have any thoughts on what I can make w/ these?? Thanks! Steve

Topic by He11uvaCook   |  last reply


I haz a sad - Gorilla competiton

So I saw the Gorilla competition and it said - make a cardboard construction and enter it in our competition. So I made my construction, and went to enter it, and only then did I see that I was supposed to be making was an instructable. This may be obvious to anyone familiar with the site, but I had not entered a competition on here before, and it does not say anywhere in the rules that a series of photographs and instructions was part of the competition. So I have a very nice cat tower made from carboard tubes (which the kitties love), but only a final photograph. Sigh. I will know next time, but I think you should say that this is a competition to make an instructable, rather than just a finished object.

Topic by kilkee   |  last reply


Source for sturdy tubes + clear stuffs

I'm going to be dropping a submersible (on a rope for now, no motors yet...) about 600 meters into open ocean. This 'Sub' will need a clear viewing window for a camera, and be sturdy enough to withstand about 700 PSI, according to WikiAnswers (apparently, one vertical meter- 1.09 PSI, right? I'm missing something, aren't I.) So, how thick/ what type of tube will I need, and where can I get it? The project is secret for now, don't ask why I'm doing it.

Topic by Rotten194   |  last reply


Can you make a cryptex out of any tube? Answered

I'm trying to make a cryptex but i don't have any pvc piping. Help!

Question by patriots8888   |  last reply


20 50mm dia x 1m long Cardboard Tubes. Any ideas?

My work has a large format printer, and as a result we have quite a few cardboard tubes lying about. I want to make something with them, but can't think of anything. . . . Its pretty think/sturdy cardboard 3mm thick.

Topic by miserydoll   |  last reply


Topic Wanted

I'm searching for Orange or Amber colored Neon tube kits. Can someone help me and tell me where I can buy these?? I'm searching for more than two month right now.

Topic by Burpy 


Can someone explain thes to me? Answered

I'v been studing electronics for a long time and ran acrost this at a web site this morning.  What are tubes?  Ive seen transistors and thought they were the betinning.  What are tubes and what are all the other symbols on the diagram. Can someone explain all of them (the simbols)  to me and what there purpose is?  Hurry ive only got about a month left of my vacaton and the its back to shool. Some day when I get the the noble piece prise for knowledge I'll include you all in my accpteance speach. PS  I've posted the skematic that didn't post before.

Question by i-want-to-know-it-all   |  last reply


Got a Lot of Vacuum Tubes

I just bought a lot of 125 vacuum tubes on ebay for 30 dollars including shipping (the seller didn't list what tubes were there, just said a crate) I got the following (if the same name is listed 2 times in a row, then I got 2): 10JA8 12AD6 12AE6 12AF6 12AU6 12AX4GTA 12BD6 12BE6 12BG6 12C5 12CN5 12CU6 12J8 12K7GT 12RS 12X4 17AX4GT 17BR3 18FW6 18FX6 18FY6 1B3GT 1G3GT 1G3GT 1S4 1S4 1S5 1T4 1U5 1U5 1X2B 21LR8 2BN4 2BN4A 2CW4 2CY5 32ET5 3S4 3S4 3V4 4BQ7A 4BZ6 4BZ7 4BZ7 50B5 5AT8 5AT8 5AT8 5AT8 5BR8 5T8 5T8 5T8 5T8 5U8 5U8 5U8 5U8 654A 6AB4 6AF4A 6AG5 6AG5 6AL5 6AL5 6AM8 6AQ5 6AQ5A 6AS8 6AT6A 6AU6A 6AU6A 6AU6A 6AV6 6AV6 6AX4GTB 6BA6 6BA6 6BA6 6BA6 6BA6 6BE6 6BE6 6BJ6 6BK7B 6BN4A 6BN4A 6BN6 6BQ7A 6BQ7A 6BQ7A 6BQ7A 6BQ7A 6BU8 6BZ7 6BZ7 6BZ7 6BZT 6CB6 6CB6A 6CF6 6CG8A 6CN7 6CY5 6CY7 6CY7 6CY7 6DQ6A 6DQ6B 6EA8 6FM7 6GN8 6H6GT 6J6A 6J6A 6J6A 6S4A 6SA7 6SJ7 6SK7GT 6U8 6U8A 8FQ7 9A8 I'm thinking about making a small amp (below 5 watts) for my ipod, which one of these would be best?

Topic by guyfrom7up 


How to make a tube amp? Answered

Hello I'm looking for a simple tube amp schematic. I have the following tubes for use: 6zh1p-e (5pcs) 6f1p 6n2p (2pcs) 6n 14p 6p15p 6f3p ecc85 (2 pcs) I'm looking for a good schematic and as powerfull as it can be

Question by theVader75   |  last reply


Q's about Tubes ("JFETs with pilot lights")

Recently I acquired a couple vacuum tubes for $35, and I gave them about 7V filament voltage, and randomly probed around with a 50V 200mA HP lab power supply to see if I can get them to do anything. I found that the most I could get was 40mA between the heated cathode and the closest gate on the pentodes, and a few mA when connected "properly". I guess I just don't have a high enough voltage. :/ I don't want to mess too much with direct mains, and I don't have an isolation transformer. I have a bunch of different tube numbers, although they all look the same to me. (some of them have different inners though!) So my questions are: * Any cool project ideas? I'm thinking FM radio w/ bluetooth tube speaker thing (obviously w/ a separate module) Maybe a nixie display too??? IDK!  * What do I need to know to get started with messing with them? * How do I know if I am pushing them too hard or damaging them? I got the anodes glowing, and the current drops proportionally. Bad? * Most of them are labeled "radio tubes" some probably were in early TVs as well. * How much current/voltage do these things typically require? Can I do any sort of dark tricks to get them to operate well at or under 48V? I know some tubes were special and can run at 12V due to design.

Question by -max-   |  last reply


whats the best place to buy plastic tubing and other DIY products?

I searched a number of sites to find plastic tubes to buy for a project but i cant find any sites that sell platic tubes are there any good online DIY stores

Question by adamc90   |  last reply


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.

Question by Higgs Boson   |  last reply


How can I test whether my preamp tubes have gone dead?

My wife has an Ampeg SVT4Pro bass head that has (3) 12AX7 tubes. From time to time we have replaced them after consulting the manufacturer about a loss of output volume. But as they all apparently do different functions in the preamp ckt I was wondering if there was a way I could tell if not all had worn out.

Question by    |  last reply