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Matrix M-Stage amp review: simple, cheap, and excellent. - Page 238

post #3556 of 4830
Quote:
Originally Posted by Chris J View Post

 

He had the volume down at Zee-ro went his "event" happened.

 

Not too sure what you mean by "Power Input"?  The 120 Vac line?  He mentioned that his DAC "survived".

 

Hmmmm, guess I better not leave my M on and unattended.

 

Remember, that thing ain't UL approved! No CE mark either. No safety approvals of any kind.

 

 

Hrmm, I doubt this would happen if Monir were running this on a 120Vac line tongue_smile.gif

post #3557 of 4830

220/240

 

And I'm kind of glad I stepped out for a moment to fetch a drink of water, otherwise it probably would've taken a longer time for me to notice the change in smell and something worse could've happened. Usually the nose gets accustomed to the change of smell in the air if it's progressive; or maybe that's just me. Anyway, I'm not gonna plug it in again and find out if it's fine. It's been more than an hour now and it still smells like a burnt plastic bag.

post #3558 of 4830

Oh and also, mine is CE marked :)

post #3559 of 4830
Quote:
Originally Posted by Monir View Post

Oh and also, mine is CE marked :)

 

If this amp had an UL listing it would cost three times as much, and in all likelihood wouldn't exist. 

post #3560 of 4830

Mine is CE marked as well. 2012 version.

 

 


Quote:
Originally Posted by elwappo99 View Post

 

If this amp had an UL listing it would cost three times as much, and in all likelihood wouldn't exist. 

 

 

Why is that?

post #3561 of 4830
Quote:
Originally Posted by Taowolf51 View Post

 

Why is that?

 

 

UL costs tens of thousands upfront, and requires even more every year to 'maintain' the listing. This all adds up to a lot very quickly, not to mention in a device like this, not only does the layout of the components need to get approved but every component also does.  UL helps "peace of mind", and a lot of times the device is just as safe before testing as it is after, so you're just paying extra for it. This could be argued all day though. 

post #3562 of 4830
Quote:
Originally Posted by Monir View Post

Oh and also, mine is CE marked :)

A good thing!

Your insurance company will be impressed!

post #3563 of 4830
Quote:
Originally Posted by Monir View Post


Hm, who's the other unfortunate headfier(s)?

Me a few days ago. It was on and unused for a few hours then I smell burning. It still works but I'm more concern about leaving it in unless I need sound.
post #3564 of 4830
The burning smell is gone now but I still don't know what caused it. The fuses look fine and no distinguishable burnt marks on the board.
post #3565 of 4830
Quote:
Originally Posted by burrrcub View Post

The burning smell is gone now but I still don't know what caused it. The fuses look fine and no distinguishable burnt marks on the board.

Maybe some resistor gone too hot. Can you take some pics from above without the up cover please? Maybe we can see "something". 

 

PD: I love pics from internal circuitry :P

post #3566 of 4830

Here was one I took immediately after I smell the burning.  I can take better ones when I get home.

 

 

post #3567 of 4830

Can you source the location of the smell? Any specific area on the board it is stronger in?


Edited by Taowolf51 - 1/22/13 at 7:02pm
post #3568 of 4830
Quote:
Originally Posted by burrrcub View Post

The burning smell is gone now but I still don't know what caused it. The fuses look fine and no distinguishable burnt marks on the board.


Did you use any OP-mod or any other mod of any kind? Monir had an LM4562 OP in his amp.


Edited by muxamed - 1/22/13 at 9:44pm
post #3569 of 4830

Mine was stock until tonight.  My 627AP came in from tamaudio.  No smell yet.

post #3570 of 4830
Quote:
Originally Posted by Monir View Post


To say the least I was a little disappointed with the packaging. I mean they used the original box as the shipping parcel. Shame, the box looks really classy/premium. I also liked the M-Stage especially with LM4562 op-amp. Just have to wait and see how they deal with return shipping. I've never had to send anything back before when buying from China/USA. It's gonna suck if I have to bite into expensive shipping costs :S
U did a opamp mod? I heared of people killing their amps because of static energy..did u use some kind of anti static gloves to exchange the opamp? Hope it will be solved soon..maybe a tip..put the original opamp back into the amp before sending it back..some brands dont like their amps being modded and then denying any warranty. I do know the mstage runs warmer with the class a mod. Good luck with it
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