Two identical Trends TA10.1, left channel of one hisses. - diyAudio
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Old 19th January 2008, 06:20 AM   #1
OzMikeH is offline OzMikeH  Australia
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Default Two identical Trends TA10.1, left channel of one hisses.

I'm using them to bi-amp my speakers.
I'm using the left channels for super tweeters and the right channels for widrange drivers.

The left channel of one amp hisses, first I thought it was my preamp but the hiss is still there with the preamp disconnected. they are using a common power supply. I'm using them configured as power amps with the volume controls bypassed. Everything between the two amp boards is identical, so why does one hiss?

Any ideas?
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Old 19th January 2008, 04:12 PM   #2
BWRX is offline BWRX  United States
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Cold solder joint on one of the boards? Leftover flux residue from poor cleaning?

Have you tried swapping the amps to see if the hissing follows the amp?
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Old 20th January 2008, 01:58 AM   #3
OzMikeH is offline OzMikeH  Australia
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I tested them before I took them apart and it didn't hiss then, I haven't been anywhere near the chip or output filter.
I have removed the volume control and moved the input caps off board, I put header pins on the board on the chip side of the input cap positions.

It hisses with the active crossover switched off which is as good as disconnected (crossover output is muted with reed relays between the XO output and the amp's input capacitor )

I have swapped speaker cables over between the two amps and the tweeter on the other speaker hisses.

A good wash of the boards sounds sensible, there was flux all over them when I got them. I'll give that a try and order a super-fine soldering iron tip and a bottle of flux.
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Old 21st January 2008, 11:20 PM   #4
BWRX is offline BWRX  United States
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You may want to try an iron tip with some more mass to it, like a blade or chisel tip. They hold the heat better than the really fine conical tips.
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Old 12th May 2008, 11:21 AM   #5
Karney is offline Karney  Sweden
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I came across this topis while googling for solutions to the same problem. I received my Trends TA-10.1 this saturday and after about 30 seconds of play I got a hiss in my right channel.

Did any of the above solutions work for you? Have anyone managed to get rid of the hissing? Any information at this point would be very helpful. I have not modified the amplifier in any way so far.
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Old 12th May 2008, 10:01 PM   #6
Pano is offline Pano  United States
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Hi guys.

Well, I should know what the problem is - but I'm stumped! With all the Trends I've had, never had a hiss problem. And never heard a T-Amp with hiss in just one channel - always in both. (Bad bias cap).

This is now the 3rd case I've heard about.

Will ask around to see if there's an answer to this.

Please let us know what you find.
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Old 13th May 2008, 06:52 AM   #7
Karney is offline Karney  Sweden
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It seems to be heat-related since the hiss doesn't start until after a short while after the amp is powered up. If I turn the amp off after the hiss starts and wait a couple of seconds (about 30 or so) before turning the amp on again the hiss is gone for a short while before returning.

I thought it might be some cold soldering so I resoldered the IC but with no luck unfortunately. I have now sent the amp back to the retailer, hopefully I will receive a fully functional this time. It sounded great for the short time it worked.

I would also like to add that "hiss" might be misleading. The sound from my amp is quite loud, it's no subtle hiss it's a noise that really makes me worry about the speakers.

I will make additional posts if I get any additional information from my retailer.
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Old 16th May 2008, 10:18 AM   #8
Karney is offline Karney  Sweden
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I received a new amplifier less than 48 hours after I put it in the mail, very nice and quick replacement.

I have no further information on the first amplifier that I received though, it was not working when I returned it and I don't think I'll receive more information about it either.

The new amplifier works perfectly and is really nice =)
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