Need help diagnosing fault with my mesa .50cal+

[Young Angus]

Ive been using my mesa .50cal+ as the speaker for my ENGL head for a little while now and the black shadow is great because its just one speaker and it can handle some punishment, and is much easier than lugging around my super heavy ENGL quadbox!

Anyway a while ago now i turned on the 50cal to play through that and it was fine for a while but after about fifteen mins playing it just sortof started crackling a little bit and fading out to nothing at all...then i think if i remember right i could turn it on standby then off standby again and it would work for about a minute before fading out again.

I haven't tried it for a while because ive had no need to but im about to try it again now...but does this sound like a problem someone may have had before?

Cheers,

YA!

Oh...and Happy New Year everyone

[Monty-Jay]

Re: Need help diagnosing fault with my mesa .50cal+

Have you tried changing out the preamp tubes?

MJ

[jeremy]

Re: Need help diagnosing fault with my mesa .50cal+

you didnt run the 50 without the speaker attached did you? that can cause serious problems. other than that, it could be quite a few things. tubes are the first thing to check since they are probably the easiest

[Young Angus]

Re: Need help diagnosing fault with my mesa .50cal+

hmmm im playing it now and it did it for a few seconds but just came back by itself and its been behaving itself since

....hahahahhaa just as i typed that it started doing it again......i think this amp can see stuff

[Young Angus]

Re: Need help diagnosing fault with my mesa .50cal+

Have you tried changing out the preamp tubes?

MJ

The preamp tubes are very new, although who is to say that means they are okay...if it keeps up i might try that.

[Young Angus]

Re: Need help diagnosing fault with my mesa .50cal+

you didnt run the 50 without the speaker attached did you? that can cause serious problems. other than that, it could be quite a few things. tubes are the first thing to check since they are probably the easiest

Nah never ran it without speaker, i know how stuffed that can be for it.

[Monty-Jay]

Re: Need help diagnosing fault with my mesa .50cal+

Well the easiest things you can do is to replace the preamp tubes one by one and see if that helps. Also, you might try cleaning the fx loop. Sometimes that will cause the signal to drop out.

MJ

[lastwinj]

Re: Need help diagnosing fault with my mesa .50cal+

possible cracked lead on a capacitor.

[Robert S.]

Re: Need help diagnosing fault with my mesa .50cal+

Jeremy thinks everything is a bad capacitor.

***** of it is, he's usually right.

[Young Angus]

Re: Need help diagnosing fault with my mesa .50cal+

Hahaha okay i might check it out, cheers

Any more suggestions are always welcome.