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 Post subject: Dramatic capacitor explosion
PostPosted: Jun Mon 17, 2019 9:32 pm 
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I'm no stranger to exploded capacitors. But this one is one of the better ones. Its a 1940 RCA 110k console and when I first pulled the chassis I almost put it down because I thought it had been a rodent's nest.

Image

That is ONE capacitor. It literally shot all of its innards out, spewing it all over the interior of the chassis.


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 Post subject: Re: Dramatic capacitor explosion
PostPosted: Jun Mon 17, 2019 9:40 pm 
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Yes, they can explode dramatically. I have seen quite a few do that, and some that the paper caught fire and melted wiring and other parts under the chassis as a result. (Usually those were the black beauty line bypass caps)
Imagine if you were working on that chassis, and sitting a couple feet away when that happened. :shock:

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 Post subject: Re: Dramatic capacitor explosion
PostPosted: Jun Mon 17, 2019 10:02 pm 
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Joined: Apr Thu 12, 2007 3:24 am
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Location: Milwaukee WI
I'll bet the previous owner had to change his shorts after turning on that radio.


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 Post subject: Re: Dramatic capacitor explosion
PostPosted: Jun Mon 17, 2019 10:09 pm 
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Joined: Dec Tue 23, 2014 6:51 pm
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Location: N. Palm Bch, Fl.
I've gotten a couple of radios where a cap has blown, but they just blew out the end. Nothing like this. I like the wire nut. Is that what we are suppose to use when we run out of solder and shrink tubing?

Freeman


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 Post subject: Re: Dramatic capacitor explosion
PostPosted: Jun Mon 17, 2019 10:15 pm 
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Location: Milwaukee WI
In 100's of radios I've owned and fixed, the only ones that blew up were the same cap on similar chassis of tube CB radios. After the 2nd one blew I started to replace them as the first order of business on future radios with that chassis. I read posts on forums of others having that same cap blow up. Its a loud pop, long hiss and a mound of stinky smoke. Upon inspection they blow out the side like a party favor.


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 Post subject: Re: Dramatic capacitor explosion
PostPosted: Jun Mon 17, 2019 10:29 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 815
Location: dayton oh usa
worst one i personally saw was a big can in an imsai 8080.
about the time i told my business partner to bring it up slow on a variac it went off like a 12ga.
he had simply plugged it in without thinking.
made a huge mess!
and yes i got it going.
never did try to play global thermonuclear war.
gotta pull it out and give it a try.


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 Post subject: Re: Dramatic capacitor explosion
PostPosted: Jun Mon 17, 2019 10:31 pm 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Fernandina Beach, FL
I had a Sony TC-630 motor run capacitor that exploded inside of the Tapecorder (As Sony called them). Mostly wax everywhere! What a mess.

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 Post subject: Re: Dramatic capacitor explosion
PostPosted: Jun Mon 17, 2019 11:53 pm 
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Location: Mountains of Mourne. Ireland.
These are super comfortable and crystal clear. ~$10.00

After a few near misses over the years, I now religiously wear a pair of safety glasses when... on the bench.

Image

The ones pictured above are super light and fully adjustable.
Similar to Western Safety item#94357
or... 3M™ General Purpose Safety Glasses-90780-80025

Greg.

oh... remember this... :)
viewtopic.php?f=2&t=350874


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 Post subject: Re: Dramatic capacitor explosion
PostPosted: Jun Tue 18, 2019 12:08 am 
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Early 80's Sanyo color TV, this was around 1991. A small cap on the power supply blew it's top, and implanted about 3/4 inch into the suspended ceiling.

Thank God I wasn't standing above it.


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 Post subject: Re: Dramatic capacitor explosion
PostPosted: Jun Tue 18, 2019 1:20 am 
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Location: Ohio 45177
Had some 60s vintage avionics that used two big metal can caps to drop 115 V down to 54 V into a transformer. The caps had sealed metal ends. When they would blow it looked about like that in a small confined area. Very messy. The can being solid metal tube it blew out the rather well sealed ends with a lot of force.

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 Post subject: Re: Dramatic capacitor explosion
PostPosted: Jun Tue 18, 2019 11:36 pm 
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Location: Chicago IL
Be sure to test it for leakage before powering on the set.

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 Post subject: Re: Dramatic capacitor explosion
PostPosted: Jun Wed 19, 2019 4:24 pm 
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Location: The Great Pacific Northwest
Someone told me about an un-restored console that had an oil filled Cap explode which
covered the back wall. :shock:

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 Post subject: Re: Dramatic capacitor explosion
PostPosted: Jun Wed 19, 2019 4:48 pm 
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Smoke and explosions i sure do like excitement of that nature when i plug them in to full line voltage and turn them on. :D

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 Post subject: Re: Dramatic capacitor explosion
PostPosted: Sep Sat 07, 2019 12:35 am 
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Location: Warner Robins, GA
wazz wrote:
Had some 60s vintage avionics that used two big metal can caps to drop 115 V down to 54 V into a transformer. The caps had sealed metal ends. When they would blow it looked about like that in a small confined area. Very messy. The can being solid metal tube it blew out the rather well sealed ends with a lot of force.


I've seen my share of exploded caps at work.

Mostly a particular feedthrough cap used for filtering any interference on the 115Vac 400Hz input. Mostly the sealed end blows out leaving a sooty mess inside.

Once had one fail where the small end that mounts it to the chassis of the small box it is in let loose. Took three or four times dunking it in an ultrasonic cleaner with isopropyl alcohol before it was cleaned enough to handle.


Had an incident when I was a teen where I was using a device which had neon indicators for the audio level and I noticed they had gotten a little dim. I proceeded to slide the chassis out of the cabinet to see if I noticed anything amiss going so far as to look at the power supply board without my glasses on. Not even 10 seconds after I slid it back in the cabinet I heard a thunk. That very power supply cap I had looked at blew its top. Needless to say all the Callins capacitors in that device got replaced immediately.


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 Post subject: Re: Dramatic capacitor explosion
PostPosted: Sep Sat 07, 2019 2:48 am 
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Location: Beaver Falls, PA. USA
Back when I was servicing theatre projectors, one guy had a big motor-run capacitor explode inside the cabinet, while he was standing next to it; the thing must have sounded like a cannon going off! When I got there to service it, I found the lid of the capacitor hanging in midair, with the wires still attached. The inside of the cabinet was full of confetti and bits of foil; the empty can was still mounted in place.

I had a spare cap to get the machine running, and as it was only a few months old, I collected all of the pieces of the defective capacitor, put them in a box, and sent it to the factory rep. Very soon after that, they had a couple of guys out in the field, replacing them; the voltage rating on the original capacitors was not high enough.

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 Post subject: Re: Dramatic capacitor explosion
PostPosted: Sep Sat 07, 2019 3:27 am 
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Location: Omak,wa,usa
Hello Bob ,
I once seen one from a tv set fly and hit a wall making a small dent in the wall.

Sincerely Rich


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 Post subject: Re: Dramatic capacitor explosion
PostPosted: Sep Sat 07, 2019 4:29 am 
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Location: Central PA 16801
when I was a kid, I experienced my first curtain burner radio.

I did not know that it had a resistive line cord.

so...I replaced it with a regular cord and plugged it into 117 vac.

about four capacitors banged like firecrackers.

as we were taking cover like the estate was under attack, one launched over and hit my dad in the shoulder.

he was on the other side of the shop and it made a nice red mark.

lesson learned at age 10: resistive line cords are not to be replaced with regular cords.

steve

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 Post subject: Re: Dramatic capacitor explosion
PostPosted: Sep Sat 07, 2019 2:26 pm 
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I remember When I was 10 building a home brew 1 tube regeneration receiver with a power supply that was right off the AC line. There was no part number for the diode so I skipped it. Filled the kitchen with foil, paper, and steam. I learned what a diode was for :shock:

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 Post subject: Re: Dramatic capacitor explosion
PostPosted: Sep Sun 08, 2019 12:51 am 
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Joined: Sep Thu 23, 2010 6:37 am
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Location: Powell River BC Canada
If an oaf of an electrician had paws under the chassis, it might be
be explainable. :D

Attachment:
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