My JCM800 Just Blew Up

[Justmc]

Just replaced a blown/defective capacitor in my Diezel Herbert.. Love the reliability of my Fractal equipment

 

[aens]

My guess is Cliff was verifying that a new/updated/refined algorithm is doing its thing.

This or it could be just a regular check to see if the model is WAI.

 

[jyflorida]

 

[Dave Merrill]

This or it could be just a regular check to see if the model is WAI.

Wazzat?

 

[Xrocker]

I had a Marshall Super Lead back in the late 70’s. It only sounded good cranked and hot. Too damn loud for the clubs we were playing so I turned it to the wall, stuck a mic back there and buried it in Bekins moving blankets.

It blew and caught fire and ignited the blankets. Saved the cabs but head was total loss. My first ever show with pyro. Scattered crowd, ended show, fire department, the works.

Ordered a Mesa Boogie MKII the very next day.

 

[aens]

Wazzat?

Working As Intended

 

[Rogerthat]

Fortunately it didn't leak. The vent hole did it's job.

It was my 2204 which is also a Canadian version. I have a US version as well but the Canadian version sounds better.

I will repair this myself. I have a set of F&Ts on the way. The only thing I don't do is transformer replacements because it takes a lot of time and my time is worth more than it is to pay a tech.

My time is worth pesos yet I still would rather have a tech do that.

 

[unFILTERed]

I heard a "phhhhhhhhtttt, snap". Looked over and smoke was coming out of it. B+1 capacitor popped.

time to get an axe fx, the era of tube amps are over

 

[InsideOut]

What parameter best replicates the "magic smoke".

I believe that would be the knob labeled Mr. Nelson

 

[yyz67]

Fortunately it didn't leak. The vent hole did it's job.

Good thing it did:

 

[skydog]

Yikes. I just checked back into this thread, as I was getting email notices. I discovered that the OP was Cliff Chase and I didn’t realize it. I answered that it would be easy to fix, as if he wouldn’t know. I’m such a dope.

My 2203 from 1981 died and fixed it. Btw, mine was caused by a blown tube that took out a couple of resistors. I replaced the electrolytics, as well. The most difficult bit were the fuse assemblies. The old plastic was cracked. The original plastic fuse assemblies are not easy to find. Here’s the photo from 07.Nov 2023.

 

[skydog]

Good thing it did:

Wow, but I’ve never seen an obliterated electrolytic. Only an amp that stopped working and a failed electrolytic. This is over the top.

 

[FractalAudio]

All fixed.

 

[Dave Merrill]

All fixed.

Magic smoke algorithm captured?

 

[skydog]

All fixed.

Good feeling, eh?

 

[Zedhed]

All fixed.

Ha...using my AxeFx, I didn't even notice it was broken.

 

[chucma]

Mmmm, I like it when Cliff starts digging out his amps from storage, it means he is cooking something up!!

 

[Piing]

Mmmm, I like it when Cliff starts digging out his amps from storage, it means he is cooking something up!!

Over-cooking capacitors

 

[Bruce Sokolovic]

Can the “phhhhhhhhtttt, snap” be modeled in the next firmware? I really want the entire 2203 experience. Had a 2555 short out on me at a gig hundreds of miles from home. Was part of the decision to go with a modeler to begin with. Marshall makes those awful plastic nuts that get maybe 1/4 turn around the jack. Those come loose, jack falls in the amp on the board and that is the end of it. Horrible design if you ask me.