Amp Smoking, Then Crackling... Not Cool! |
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Amp Smoking, Then Crackling... Not Cool! |
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Oct 18 2008, 10:48 AM |
Maybe a bias issue to start with. Since you replaced EL34's with 6L6's which require a different bias. You said it happened when you put it to standby and sure, the amp lets current through in stanby but that's less that when it on. So I don't know what could have fried though.
And I don't know about the bias current but like timmy describes it it seem like EL34's has a lower bias current. The cackling you hear is typical for a tube gone bad. Check if any is luminated oddly or sings when you pat it with a pen. And btw when changing tubes one should also add some electric spray to clean the sockets up bit. EDIT: I's suggest you have a tech take a look at it. This post has been edited by MickeM: Oct 18 2008, 10:49 AM -------------------- My bands homepage
All time favourites: B. Streisand - Woman in Love, M. Hopkin - Those were the days, L. Richie - Hello |
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Oct 18 2008, 11:39 AM |
I never had similar problems
tho I never experimented a lot with tubes either. I guess bias is the issue,take it to the tech to be sure. -------------------- Youtube
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Oct 21 2008, 07:19 AM |
Hey, sorry for never getting back to anyone. Thanks for the advice, but the problem is somewhat solved. Long story short, it turns out that one of the power tubes was bad anyways, all the other tubes are fine, and you can use 6L6s in the outer slots. The only problem is the crackling in the Class A mode is still there, not sure what it is. All the preamp tubes are fine, tested them one by one. Electrical problem, maybe? Do you think it's safe to run it? The crackling isn't there in the Simul-Class mode, which I always use anyways. Anyways, thanks guys! P.S. I've heard that Mesa amps don't need to be biased, at least the Mark series. Is this not true? But still, I never had a poweramp go up in smoke before so I don't think that's right. I'm still suggesting you leave it for service. There are self biasing amps and the manual should say if yours is or isn't. -------------------- My bands homepage
All time favourites: B. Streisand - Woman in Love, M. Hopkin - Those were the days, L. Richie - Hello |
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Oct 21 2008, 12:26 PM |
I agree with everyone here, if you have crackling in Class A mode, it is best to go and check it out now, then later mate.
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