Worlds Weirdest Microwave Oven, From A Weapons Factory - The Husqvarna Cupol
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- Опубліковано 31 лип 2024
- #Teardown of a 1970's #Microwave Oven from Husqvarna. The model "Cupol" was a iconic design from the Swedish designer Carl-Arne Breger. #highvoltage
Discussion of the teardown: highvoltageforum.net/index.ph...
Additional information and pictures of the Cupol Microwave Oven and its designer.
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www.minnenasjournal.nu/carl-a...
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Where was this video shared yesterday? :)
Someone linked to this video after I posted a video on Reddit yesterday showing one of mine working… so that’s that!
@@ianbakke Thanks for getting back to me! Got a link to the thread? :)
Well, I add this video in my "weird stuff teardowns" playlist. Now you need to find one those those late 40's, US-made, fridge-sized microwave ovens made with overstock radar parts from WW2 !
heh heh heh, yes
I would love to find even older, but I fear they will be hard to find in Denmark. I got another video where a Husqvarna Model 106, industrial oven, had a 14 kg C-core transformer: ua-cam.com/video/dMLOimT4PgA/v-deo.html
As far as I remember the string squares are an extension of the waveguide to break up the waves more to make them spread better.
I have a few of these ovens but it was quite a while since I last tried one, I think the heat was most intense over the two squares, you got to hot spots when heating.
I must admit I don’t remember everything about them but at the time I was quite interested and gathered all the information I could but it’s now almost 20 years ago.
Why do you take it apart instead of putting it together, it seems complete.
If you put it together, and if you try it, do remember you need to leave the switch on the rear on for over a minute before trying to start it, otherwise you’ll get no microwaves and you’ll think it’s not working.
I know a few people including myself that have thrown it away believing it’s not working due to not knowing about this strange warm up.
Well the dimensions of the rectangles seems to be tuned to 2450 mhz so.. yes its an antenna.
Nice video, ive never seen microwave ovens that old, its a relique.
Would the purpose of this antenna serve as a "minimum load", so the magnetron would never get destroyed from reflected energy?
@@KaizerPowerElectronicsDk i'm not much into rf, but taking in count each rectangle is 1/2 wavelengh by 1/4 wavelength and both rectangles are separated 1 wavelength from eachother and both grounded, i guess the purpose is to reflect the wave 180 degrees so it cancels the incoming waves into the magnetron. please someone more experienced on this tell me if i'm wrong.
We live in Estonia.... during this CO 19 lock down we found one of these in a far corner of our attic... haven't tried it out yet...
This is wild, thanks so much for sharing!
9:50 It seems to me it's there to provide minimum RF load so that when someone accidentally turns it on without food some of the energy will be absorbed in this 'antenna' and turned into heat instead of going back to magnetron and destroying it.
Not a bad suggestion, the 90 degree wave guide output could be there for the same reason. A modern just emits directly out of the tube.
The two temperature sensors are actually for two different things, the reason that there are two is not for redundancy. One of them is to turn the microwave oven off if it were to overheat. The other is to turn the fan on when the microwave is beginning to get hot, if you run it for less than one minute the fan won’t start at all.
I have two of these ovens, one that is a little bit different than the one in this video that is working and that I use quite often, and one that is exactly like this one and is currently not fully functioning.
Thank you for the input! Is it a superior microwave oven compared to newer models? Is it more powerful or less efficient?
@@KaizerPowerElectronicsDk I actually got both of them working, kind of surprised there.
Well, the efficiency is as you can imagine not very high, around 50-60%. This is a bit worse than a new microwave which would have an efficiency of around 70-80%.
They are about the same power output the older one is at 1000W and the newer 700W. The heating is surprisingly even considering that there are no moving parts, it might have to do with the quirky antenna inside the oven.
I would not say that it’s superior to a new one considering the odd shape and it’s limited space inside. It is however cool to show off.
700W of raw wifi jamming power. It would be worth a lot these days.
more like 700W of raw wifi destroying power.
This is the first time I have ever seen a microwave oven that doesn't look like a microwave oven. The opening lid reminds me of old-school AGA oven, maybe that is where the style came from?
Nice Old Microwave Oven 😀 another great Video 👍 I wish you a Merry Christmas 🎄 and a relaxing holiday´s 😃 greetings & Cheers 🙂🍻
Great video! I've never seen on microwave this old, it was pretty cool to see inside :-)
excellent, as always! Never seen a Microwave oven like this before...
The C-Core transformer is wonderful. Todays Ovens have cheap transformer, with aluminium wire (painted red). I alos love the wheel dial thingy. Thanks for showing us!
Thank you Max :) I got another video where a Husqvarna had a 14kg C-core transformer: ua-cam.com/video/dMLOimT4PgA/v-deo.html
Looks like demon core 😄
Please dont put uranium into this :D
The magnetron output is a monpole. It goes all directions. Neat microwave, thanks for sharing.
More like radial radiation pattern, so kinda fits with feeding into a waveguide-like structure.
Thank you for wearing a mask.. I thought about beryllium oxide as soon as I saw that old magnetron! Very interesting find, I never saw a microwave oven shaped like this.It looks very stylish (more like 70s than 60s) but to be honest its too large for a small kitchen. No wonder it did not sell well (beside the high price I assume).
Very likely it is a beryllium oxide unit, being that old, though probably only alumina for the output cover, only beryllium oxide for the magnetron seals, which would need the heat transfer capacity of the beryllia. I worked with magnetrons that vintage, and the only beryllium oxide parts were in the power supplies as insulators for transistors, and some others in ionisation switches, as they had a large amount of heat generated in a tiny cavity, and needed to be kept cool for fast quenching. the bigger worry was the Amerecium ionisation helper, a tiny little gold sputter on the wall, that would eventually decay away entirely with time.
@@SeanBZA Sean: thank you, very interesting
@@SeanBZA Sensible, why would they use exotics if they don't have to?
I see many go "all ceramics must be toxic", while I totally fail to see why they would use it evrywhere.
How do you relate to thorium in neon bulbs?
@@erlendse There is a very tiny amount, and in general it is safely contained in glass, so is quite inert. Still would not grind them up and eat them, more for the heavy other metal content. Biggest source of radioactivity in the typical house is the nice new granite kitchen counter top, unless you live in a radon containing area, in which case the basement will be a bigger worry.
Just remember that they cannot build a nuclear power plant in Scotland, because the background radiation from all the granite rock there is close to exceeding the workers dosage limits. In some places they would be past the limits, and people have lived there for centuries, just wearing kilts, and with the Scottish national weapon, the bagpipes.
It’s suppose to be installed in a hole, with only the dome and buttons visible, this makes it in fact very slim and uses less space than a new microwave. It actually look both cool and futuristic when installed properly.
The antennas may be to actually retransmit the RF for better oven coverage?
As for beryllium, based on the age of it, it's likely wise to be careful.
Could you do a closer look at the airflow deal for it all?
Looks like you should be able to retrofit a newer magnetron, if you so desire.
Looks like the magnetron kinda feeds into a waveguide (not too uncommon)
You could possibly try to dismantle the magnetron wet, or just leave it alone.
Be careful of that ceramic piece and don't break if you aren't sure what it is made out of. There is currently no treatment for contacting beryllium oxide.
It was unfortunately already broken and also why I was wearing a mask :)
Should be easy enough to retrofit a more modern magnetron into that unit, probably easiest by taking the cavity wall and the magnetron as a unit, and making a new plate to hold it. You probably are missing a high voltage fuse assembly that links the power supply and the magnetron/filament supply, as in a unit this old they would have definitely put in a high voltage fuse, or a high voltage fusible resistor assembly to prevent damage if the magnetron failed.
Would be a nice unit to repair, with that retro look to it, though replacing that plate with a new one would likely involve a bit of work, to get a new plate/base that is transparent to RF, probably will have to be specially made out of a ceramic, and then fired and glazed.