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Old 12th April 2005, 05:26 PM   #1
JMGJMG is offline JMGJMG  Canada
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Unhappy SI T-AMP dead?

I **think** I need help. I posted a message on AudioKarma.org Discussion Forums and someone answered me that I should also try here. Hereís my message:

I received my T-AMp yesterday and (probably) did the worng thing: I have (has, heís dead now) a 12V power supply that I used with my Musical Fidelity X-Cans headphones amplifier. 12V is 1V is 12V, right? Mmmm, not su sure, now... The Musical Fidelity power supply was a 500mA and the T-Amp needs a 1500mA. The MF power supply died (a loud Clac!) and now my T-Amp smell like something has burned inside and donít work, even with batteries.

Now for the question: Do someone knows which part of the T-Amp could have burned? Do you think it can be (easily) replaced? Of course I guess if itís the IC, I just have to buy a new Amp... Do you think that itís the diffrence of mA (500 vs 1500) that blew the power supply and the T-Amp?

Thanks
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Old 12th April 2005, 05:49 PM   #2
joensd is offline joensd  Germany
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Unfortunately it sounds like you reversed the polarity of the supply
which blows the TA2024. Yes, there is no protection against that in the amp.
Did you check the polarity of the supply and amp?

Quote:
Do you think that itís the diffrence of mA (500 vs 1500) that blew the power supply and the T-Amp?
No, you should have heard the amp clipping before.
Might have been your speakers if they are fairly hard to drive or better: have very low impedance dips.
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jens
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Old 12th April 2005, 06:36 PM   #3
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Default Re: SI T-AMP dead?

Quote:
Originally posted by JMGJMG



12V is 1V is 12V, right? Mmmm,

Thanks

Did it kill the power supply also? I suspect the power supply was wired with the outer connection hot and the inner ground.
This has let the smoke out of several 5066's. I do not think using a 500 ma supply hurt anything. It would limit the power output.
Also, your question about voltage is a little confusing. I accidently ran a 5066 at 16.6 volts for a week. Did not hurt it one bit.
It thought the MF gear ran on 24 volts. You might check if the power supply still works.

George
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Old 12th April 2005, 07:12 PM   #4
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The Musical Fidelity power supply is AC 12-0-12 Volts ( http://www.musicalfidelity.com/mf/en...SmallX/SXCANV3 )
You have put AC instead of DC in your t-amp and now is dead for sure (at least the TA2024 chip), if you buy another one remember also that the + of the power supply goes to the center of the plug.
Ciao
Marco
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Old 12th April 2005, 07:12 PM   #5
JMGJMG is offline JMGJMG  Canada
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Thanks! I wonder now if itís under warranty...
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Old 12th April 2005, 07:12 PM   #6
JMGJMG is offline JMGJMG  Canada
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Quote:
Also, your question about voltage is a little confusing.

Should have been *12V is 12V is 12V, right?* Yes, the power supply is now dead... And, whatís worse, I tried the dead power supply on me MF headphone amp (to check if it owrked) and it seems that that caused problem to the amp (in any case, itís what the man at the shop where I bought the MF headphone amp said to me on the phone). Now the headphone amp donít even work with a Radio Shack power supply (qith correct, voltage, amerape and polarity)...

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Old 12th April 2005, 08:05 PM   #7
Nisbeth is offline Nisbeth  Denmark
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Quote:
Originally posted by JMGJMG
Thanks! I wonder now if itís under warranty...
That is very unlikely. Manufacturer's warranties normally cover defects in materials and/or workmanship. You need to be a bit "creative" with the truth to call what happened either of those things


/U.
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Old 12th April 2005, 08:34 PM   #8
toddsts is offline toddsts  United States
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I have a MF X-Cans V2 headphone amp. The Power Supply that comes with it is definitely 12V 500mA but it is also definitely AC power. I doubt the S.I. reacts well to AC. Double check the Radio Shack Power supply as to whether it is AC or DC power. I don't know what effect plugging the MF X-Can into DC power would have other than it not working on that power supply. 12V does not equal 12V when you mix AC and DC. Parts Express sells some 12V AC adapters that should replace your original MF one. I think they will ship to Canada. Sorry you burned up your S.I., Parts Express has those too. (Note: I am not affiliated with Parts Express, just a happy customer. )

Todd
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Old 12th April 2005, 09:58 PM   #9
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Told ya the experts hung out here.
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Old 12th April 2005, 10:03 PM   #10
JMGJMG is offline JMGJMG  Canada
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One last question (I hope) to Toddsts: Will a 12V/400mA (not 500) AC adapter work safely with my X-Can v2?

Thanks again!
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