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 


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


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 


Where to get a vacume tube necklace? Answered

I want to make a necklace#

Question by nerd7473   |  last reply


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

Question by fatfoohy   |  last reply



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.

Topic by jackillac92   |  last reply


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

Question by macwhiz 



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?

Question by    |  last reply


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

Question by gort59.5   |  last reply


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 .

Topic by DarkPlace   |  last reply


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

Question by Scotty3000   |  last reply



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.

Question by Capt. Howdy   |  last reply



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?

Question by harrywatts16   |  last reply


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 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Question by LASOUND