Mesa Boogie TT800 hum

[Matt Dean]

Before I contact and test Mesa's post Gibson buyout customer service, I thought I'd throw this video up for a reality check. Bought this used late last year, and it was pretty dead quiet. But, a couple of days ago, I fired up the TT800 and (to my ears) a loudish hum started happening. Nothing effects the hum, it's there even with nothing plugged into the input jack.

Check it out... @agedhorse

 

[dbase]

Did you change all the caps?



just kidding
I got nothing

 

[gyancey]

Pitch increases briefly before stabilizing, sound to me like it's tracking the fan as it accelerates? I had a similar problem with my D800+ which I never nailed down but went away after I reassembled it.

 

[agedhorse]

I don't know what this is, give our service dept a call and see how they would like to handle this. It's possible that the fan is defective, but I don't think so.

 

[Matt Dean]

I don't know what this is, give our service dept a call and see how they would like to handle this. It's possible that the fan is defective, but I don't think so.

Thanks all... just left a msg at MB. I'll probably drop it off tomorrow.

 

[g-dude]

Did you also try a different outlet in your house?

 

[Matt Dean]

Did you also try a different outlet in your house?

Ahh... this.

@agedhorse I got a call back from MB and arranged a repair ticket. Then I saw the suggestion from @g-dude - I just tried a new plug-in on a different wall, and bingo, hum gone.

 

[agedhorse]

Ok, I was under the assumption that it had been working fine there and something changed with the amp.

If that solved the problem, be sure to let the service dept. know.

One power fault that can cause this is when the neutral and ground are bonded at the receptacle or elsewhere other than at the service entrance.

 

[Matt Dean]

Ok, I was under the assumption that it had been working fine there and something changed with the amp.

If that solved the problem, be sure to let the service dept. know.

One power fault that can cause this is when the neutral and ground are bonded at the receptacle or elsewhere other than at the service entrance.

I called right away.

I am always happy to provide object lessons for the greater good!

(And I live in a house where my wires could be crossed.)

 

[Geri O]

One power fault that can cause this is when the neutral and ground are bonded at the receptacle or elsewhere other than at the service entrance.

This is a problem we see so often in the production biz, I'd call it rampant (in my part of the country, anyway). This causes so many people many futile trouble-shooting hours without realizing where the problem actually lays.

 

[agedhorse]

This is a problem we see so often in the production biz, I'd call it rampant (in my part of the country, anyway). This causes so many people many futile trouble-shooting hours without realizing where the problem actually lays.

Agreed.

 

[Al Kraft]

This is a problem we see so often in the production biz, I'd call it rampant (in my part of the country, anyway). This causes so many people many futile trouble-shooting hours without realizing where the problem actually lays.

This and poorly designed/shielded equipment (e.g. lighting fixtures) being near a bass/cable/amp can also contribute to these kinds of problems IME.

 

[agedhorse]

This and poorly designed/shielded equipment (e.g. lighting fixtures) being near a bass/cable/amp can also contribute to these kinds of problems IME.

We are seeing more and more counterfeit certifications on things like LED lighting and networking equipment that can also cause serious noise issues.

 

[PullThePlug]

Used mesa subway series heads have a reputation of having issues and/or dying out like that.

Customer service is your best bet unfortunately.

Best of luck!

 

[pfschim]

Used mesa subway series heads have a reputation of having issues and/or dying out like that.

Customer service is your best bet unfortunately.

Best of luck!

hmm, not sure I've seen any meaningful reports to back this assertion up .... what's the source of your data for this claim ?

 

[agedhorse]

hmm, not sure I've seen any meaningful reports to back this assertion up .... what's the source of your data for this claim ?

Nor have I, and I have actual data!

The most common problem we see on Subway amps is when they get dropped. That's obviously not the fault of the amp, BUT some players think so.

 

[Al Kraft]

hmm, not sure I've seen any meaningful reports to back this assertion up .... what's the source of your data for this claim ?

Same question...I sort of follow the SW series threads and I haven't noticed anything like that at all.

 

[N4860]

I'm glad to see this was easily rectified. I've got a Mesa M6 Carbine and PH610 but I've been looking to switch to the subway series (maybe the WD800) but I definitely have some concerns about the reliability of the amps, mostly due to a bad experience with the customer service for my M6 Carbine when I bought it used so I'd definitely like to not have to deal with that again.

 

[Al Kraft]

I definitely have some concerns about the reliability of the amps,

IME Mesa SW gear has an exceptionally low failure/defect rate and in the very few cases I've heard discussed the problem was quickly resolved.

 

[N4860]

IME Mesa SW gear has a exceptionally low failure/defect rate and in the very few cases I've heard discussed the problem was quickly resolved.

That's good to hear. I've read most of the threads about the SW series gear when it comes up and I haven't seen many issues but I feel like I'll always have that worry in the back of my mind unfortunately. Fortunately the Mesa cab I have has always been great and reliable and I love the sound of it.