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


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 


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


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 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


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


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


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


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


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 


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


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



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


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


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


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


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


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 


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


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


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 


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


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


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


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 


how to make homemade tube bender?

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

Question by fietser   |  last reply



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.

Topic by DonaldStott 


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

Topic by fungus amungus   |  last reply


Xenon flash tube light? Answered

Would it be possible for me to pulse a xenon flash tube brightly at over 100hz for prolonged periods without damaging the tube? Would there be a simple enough circuit for it that ran on 3V? Lastly, would the tube flash fast enough so I would not now that it is flashing?

Question by .Unknown.   |  last reply


Fluorescent tube starter question

I m really really curious about something you know the starter switch used in fluorescent tubes have a glass "bulb/tube" with a bimetalic strip i know what that is for but i dont understand what the coil beside the "bulb/tube" is for, and it feels like a coil but i think its more of a piece of metal wrapped i n plastic  

Topic by michaelgohjs   |  last reply


How to shrink Surgical Tubing?

Does anyone know how to shrink surgical tubing? 

Topic by MaxCrave   |  last reply


What is this plastic tubing called? Answered

Hi all, I came across these woven plastic tubing which when squeezed on either end turn into toy rockets in a science and technology museum and I was wondering if anyone could point me in the direction of where I could source more of these things. I recall they were named 'boone rockets' but that's been a fruitless internet search. I would love to apply this product to jewellery/sculpture so it would be good to know what the process/technology is called. Cheers!

Question by jarris   |  last reply


Vacuum tube clock kit

This lovely clock is made from a new kit from Adafruit Industries. Once they're back in stock you can get the whole kit for $65 or just the PCB for $15. If you truly want to do everything yourself you can make the whole thing yourself with instructions here.HOWTO make a vacuum fluorescent display clock

Topic by fungus amungus   |  last reply


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

Topic by randomher0   |  last reply


Vacuum Tube Night Light

Hello All, I have four 12AX7A vacuum tubes out of an old guitar amp.  I'm not sure whether they work or not-the sound was extremely poor, but this could have been due to any number of things wrong with the amp, which is gone now.  I saved the tubes, as they still lit up when powered on.  I would like to turn the tubes into some kind of low glow night light/art project, but am not quite sure how to go about wiring them in parallel with one another, or even the correct voltage.  I have no experience with tubes, but would love to start learning, even just the basics...like how to power them up.  How complex a circuit would it take to do this?  Thanks!

Topic by huck alexander   |  last reply


Paint Plastic To Copper Tubing

I'm making a prop that requires a length of coiled copper tubing & I don't have the cash to buy it. I need a plastic tube that is malleable into a coil & I can spray paint it a copper color. I've experimented with some types of plastic cover electric cord & aquarium tubing & both, the plastic reacted with the paint & never dried.  I need to know what types of plastic tube I can ether paint myself & wont melt the plastic, or point me in the detection of were I can find copper colored plastic tubing, or name the types of plastic tube that wont react to certain types of paint.

Topic by elkaddalek   |  last reply


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?)

Question by Kiteman   |  last reply


Vacuum tube amp help

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   |  last reply


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)

Question by Bartboy   |  last reply


LED glow tubing question?

I am thinking of putting some glow tubing on the inside of my 14 foot jon boat, mainly for night fishing. It would also make it look really cool at night. The concept is simple, some of you may know - clear tubing from the hardware store, filled with water, with an LED in either end. This should light it up even if it is curved, right? I want to put long tubes running the length of the boat, on the inside groove of the side runners. That would mean 13+ feet of slightly curved glow tubing. I may have to end up splitting the glow sticks into smaller sections, but would like to see if I can do long single tubes. I'm concerned that the light will fade out in the middle considerably. I'm OK with it fading a little, but I don't want it to be noticeably bad. Will a narrower light beam help solve the problem? (found some 12 degree online) I will go for the narrowest beam and highest candlepower possible.  Am I on the right track? Got any advice?  Thanks a bunch

Question by catman529   |  last reply


adjusting brightness in you tube

Is there a way to adjust brightness in you tube videos

Topic by pops1943   |  last reply


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