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Extreme "gassy" vacuum tube failure

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Pulverrostmannen

Pulverrostmannen

Күн бұрын

here is a video showing a failing vacuum tube or valve as it is called.
it may be a normal thing to see a faint blue light inside the plate or on the glass on some parts of a tube, but when it become like a haze like this it is no good at all, it is often pink color but this tube was more blue. a "gassy" tube is simply that it partly or mostly lost it's vacuum due to air has leaked in to the envelope that cause it to fail, in these cases the "getter" (it is the black or chrome colored part normally at the top of the tube) mostly has disappeared or turned white and is a sign that the tube may fail or already does so it can be a good thing to keep in mind. anyway hope you enjoy the light show :)
Music used in this video is made by me Powertoast Music:
first song: "Tears from heaven" Work in progress
second: Fatal Meltdown (this video has a cut version) full version by folowing this link:
• Fatal Meltdown - Power...
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Пікірлер: 27
@justsumguy2u
@justsumguy2u 7 жыл бұрын
Well done. EL41 is an output tube, and it was interesting to hear the shorts being transmitted through the speaker.
@Pulverrostmannen
@Pulverrostmannen 7 жыл бұрын
Thanks! This radio was a Push-Pull design and had two EL41 in the output stage and one still works of these. but the whole radio was a disaster in most ways and completely destroyed but I bought for close to free to get some parts out of it and this gassy tube was rather fun and very florescent so I found it fun to record it before I salvage the radio. the transformer and some other stuff will have a new life soon :)
@user-tu9lm3lp2n
@user-tu9lm3lp2n 7 ай бұрын
Looks like the electrons making Party at the weekend.nice .🎉😂
@Pulverrostmannen
@Pulverrostmannen 7 ай бұрын
Indeed. I bet they were playing electronic music too lol
@goodun6081
@goodun6081 5 жыл бұрын
A mild blue or purplish glow just on the inside of the glass all around the tube is generally okay, the result of stray electrons striking the glass, but a blue glow coming from within the metal elements and parts of the tube indicates a badly gassy tube (with one exception: a strong blue glow is normal for mercury vapor rectifier tubes such as the type 83 tube used inside a Hickok tube tester). A gassy tube is not necessarily caused by "air" inside the tube, more likely it means that gases and solvents and even water vapor that had been absorbed by the internal parts of the tube before/during manufacture have outgassed since then and contaminated the vacuum. Sometimes this happens to New Old Stock tubes while they are just sitting there, and this would generally be considered a sign of poor manufacturing processes and techniques. However, running a tube well beyond its limits or in a malfunctioning amplifier that causes the tube to overheat for a significant period of time can also cause outgassing from the tube parts and make the tube prone to run away bias and grid emission and so on. If the formery silvery or brownish getter on the inside of the glass has turned almost snow-white, that is definitely an indication that the tube has completely lost its vacuum. Stick a fork in it, it's done!
@Pulverrostmannen
@Pulverrostmannen 5 жыл бұрын
good 'un indeed, there are many types of internal glow in various tubes that tells how the tube works and many are not in any way bad signs. For example as you mentioned the blue glow on the inside on the glass bulb itself caused by electrons hitting the glass and contamination’s on the glass is a good sign in my eyes as the tube is working as it should. The most common tube I see this on are 6L6GC, they tend to be glowing a lot on the glass bulb like this with a deep blue-purple glow that is stronger on certain spots and all tubes works absolutely perfect. On other tubes as you say when the glow is inside the plate can be bad signs in many cases but as I seen it they can also have a special glow near the plate that I seen on many tubes that is not a sign of a defect tube. For example I seen this in many tubes too, both new production and nos tubes as well such as EL34 or Russian tubes such as 6N1N-EB. The glow is a very faint light blue glow inside the plate but most closest to the plate during warmed up operation, often seen through the small holes on the plate but so faint it is only seen in dark conditions. This may be caused by certain gasses reacting to the electrons but all tubes I seen this on still have absolutely perfect getter without signs of wear or change of color. In fact these tubes have been performing very good for hundreds of hours even without losing any performance. I cannot tell how long they gonna last because I never had any of these tubes get used up yet that has this small specific internal glow. But I also seen many tubes with really bad signs due to gassy characteristics but they have all had a very faint or white getter at the same time along with both internal arcing or other strong blue or purple glow both inside the elements and outside of them and they are beyond repair indeed. Tubes are sometimes very mysterious but always wonderful to have
@Jericho297
@Jericho297 3 жыл бұрын
I had a tube from the 1930s that had the same issue, interesting to see but a expensive pain in the backside since I definitely need to replace it.
@Pulverrostmannen
@Pulverrostmannen 3 жыл бұрын
Yes indeed, the sad part is that your tube would likely work fine if it wouldn’t had lost it’s vacuum. What is the tube you need?
@Jericho297
@Jericho297 3 жыл бұрын
@@Pulverrostmannen I think it might of been a UU4
@Pulverrostmannen
@Pulverrostmannen 3 жыл бұрын
@@Jericho297 full wave rectifier. Rather uncommon as far as I know and quite expensive to buy on eBay. If you just have to get something to test or work with you could probably re-socket an AZ1 tube in the foot you have. It would electrically be rather close but be sure to check if the capacitors would take the warm up voltage since yours is indirect heated it gonna take longer time before you get HV applied and then your other tubes have time to warm up. But if your power tube is direct heated it won’t be any issue. Just as an example what you could do until you know what you wanna do
@Jericho297
@Jericho297 3 жыл бұрын
@@Pulverrostmannen yeah but it’s a British set it’s on so the socket needs a specific alignment of pins, I know some temporary alternatives that’ll do for now till I can find another but thanks for the info, I’ll see what I can do.
@Pulverrostmannen
@Pulverrostmannen 3 жыл бұрын
@@Jericho297 I understand. But I have done it quite a few times and even still use it. The concept is to take off the socket from the broken tube and then solder wires onto the pins and route this to the different tube in the correct order and then fit the new tube on top the old socket. Kinda like a built on socket converter. But it’s just open suggestions to your chosen solution. Good luck with your device. Keep the tubes glory remembered
@baibhabmukherjee368
@baibhabmukherjee368 7 жыл бұрын
hey i love ur videos
@Pulverrostmannen
@Pulverrostmannen 7 жыл бұрын
Thank you! the video you been waiting for is up now :)
@H-77
@H-77 4 жыл бұрын
Looks like it turned itself into a thyratron.
@Pulverrostmannen
@Pulverrostmannen 4 жыл бұрын
Oscar Anderson ha ha indeed. And it kinda worked like one too because once it started to arc in the gas it kept going at a lower voltage too until it was below a certain point. That poor thing
@timmyv694
@timmyv694 6 жыл бұрын
I have a new el34 doing this. Could it be something in the amp causing this to happen or is it just a defective tube?
@Pulverrostmannen
@Pulverrostmannen 6 жыл бұрын
TimmyV if the tube flashes like mine do here it is probably a defective tube you got, check how the getter is looking on top of the tube. If the getter is white or transparent or fainted/missing partly or completely the tube is gassy in almost every case. If the getter is Solid and black/chrome colored and you can’t see trough it at all it is normally fine and it could be some other problems with your amp. Another thing you may check is if the cathode glows normally and how fast and hot the tube gets when it warms up, if the cathode barely glows and the glass of the tube gets really hot real quick it is gassy. This test is best done with the DC+ disconnected and only applying the filament voltage on the tube. If it takes a long time for the cathode to glow and the tube glass gets very hot very fast instead it is faulty. If the cathode glows within the minute and the tube glass gets warm slowly over the coming time it is probably fine. I would examine the tube separately and check the getter first, and maybe trying to heat it with a separate 6,3 volt filament power source and check for defects before trying trying to power up the amp with it again as these kinds of arcs can be very harmful for your amplifier as it overloads and shortens out internally when this happens in a tube.
@Pulverrostmannen
@Pulverrostmannen 6 жыл бұрын
Po Lu yes indeed broken beyond possible repair
@kbkman7742
@kbkman7742 5 жыл бұрын
miniwatt? Those are Australian tubes aren't they
@Pulverrostmannen
@Pulverrostmannen 5 жыл бұрын
Not really actually. Miniwatt is stamped on tubes made by Philips but the brand name is barely seen on this tube in the video. Philips was made in different factories depending. But all tubes are more or less marked Philips Miniwatt :)
@kbkman7742
@kbkman7742 5 жыл бұрын
@@Pulverrostmannen yes you are correct, I was just used to seeing 'miniwatt australia' in old aussie radios
@electronicsfixer
@electronicsfixer 2 ай бұрын
I can hear this on my record player but that is because it gets super hot and is worn out Getter Is OK Compared To This Edit : I Measured It And It Gets Up To 240°C Celcius Jikes! Edit2 : Blueish Glows Starting now And infrared plating (checked with my new 3ds front camera)
@Pulverrostmannen
@Pulverrostmannen Ай бұрын
@@electronicsfixer yeah, gassy tubes runs much hotter since they internally short out and pull more current than they should. Be careful if you run these tubes in sensitive equipment since it can damage your other components by overloading resistors and stuff. But it is fun to watch them self destruct like this too
@electronicsfixer
@electronicsfixer Ай бұрын
@@Pulverrostmannen It's Not As Bad As This But It Does Show Blueish Glows OnOne Spot On The Inside Before Heating Up And Then It Disappears I Havent Checked On It In A While And I Only Run It For Brief Periods Each Time As It Does Start Crackling After A While But No Visible Arcs Yet
@Pulverrostmannen
@Pulverrostmannen Ай бұрын
@@electronicsfixer it is a typical behavior, they generally lose their getter first or they get white or faint or in other ways visibly affected as the air that leaks into the tube gets absorbed into the material. When the getter can’t absorb more gas the tube starts to fail by slowly emitting more current than it should in unpredictable ways and eventually arcs over by forming plasma in the gas. The more gas it has the more it will glow and fail. I had some other fantastic failures that I have not shown on KZbin but that I really should do sometime
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