Different between LM3886T & LM3886TF - diyAudio
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Old 19th June 2007, 12:12 AM   #1
ttan98 is offline ttan98  Australia
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Default Different between LM3886T & LM3886TF

The main different between the 2 chipamps is that the TF version has an insulated heatsink.

I am wondering whether

1. there are any other differences besides that mention above. I suspect not.

2. difference in sound quality.

any inputs from those who has experimented with both.
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Old 19th June 2007, 12:17 AM   #2
BWRX is offline BWRX  United States
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Default Re: Different between LM3886T & LM3886TF

Quote:
Originally posted by ttan98
I am wondering whether [there are] differences in sound quality.
The easy way to figure that one out is to build two identical amps with each version of the chip and listen for yourself
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Old 19th June 2007, 12:18 AM   #3
Nordic is offline Nordic  South Africa
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The plastic case is a worse thermal conductor, and because of that the plastic chps have a slightly lower peak thermal output.
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Old 19th June 2007, 07:55 AM   #4
DcibeL is offline DcibeL  Canada
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You have to consider the entire thermal path. When using the chip with plastic case, you do not need an insulator between chip and heatsink, and one less layer of thermal paste. I think in the long run the plastic case is definitely worth it, and thermally will not be much worse if at all than the metal tab version.

Other than the package type, the two chips are identical.
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Old 19th June 2007, 08:17 AM   #5
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If you plan to use +- 40 volts and heavy use, then you must have the "T" version but is it home environment, lower supply voltage, then the "TF" model is to prefer. Easier to mount fewer things can go wrong.
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Old 19th June 2007, 08:20 AM   #6
Nordic is offline Nordic  South Africa
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Well, as I said, slightly....

I also use TF package and my supplies are +-35V with 8ohm load.
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Old 19th June 2007, 10:41 AM   #7
weissi is offline weissi  Europe
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I have all my TF's sanded, removed about 0,2mm. just so far that you cannot see those little round grooves anymore. Maybe, if someone has a defective LM3886TF he could provide some empirical data to see how much is safe.
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Old 19th June 2007, 10:58 AM   #8
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Quote:
The main different between the 2 chipamps is that the TF version has an insulated heatsink.
Quote:
1. there are any other differences besides that mention above. I suspect not.
Quote:
2. difference in sound quality.
Quote:
any inputs from those who has experimented with both.
.
Quote:
If you plan to use +- 40 volts and heavy use, then you must have the "T" version but is it home environment, lower supply voltage, then the "TF" model is to prefer. Easier to mount fewer things can go wrong.
I have built both
I have run the maximum supply voltage
I find NO difference in sound quality between them.
The uninsulated one doesn't run much hotter when used on the SAME heat sink. The difference is about 2 degrees when measured with an infrared thermometer using a 1K sine wave with identical testing times

Personal opinion here ...

I believe that a lot of problems are caused when trying to use heat sinks that are way to small. I have used +-40 volt supplies with a 4 ohm loads without any problems. Mine have spent hours running loads not to mention the cruel beatings they received playing music.
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Old 20th June 2007, 01:12 AM   #9
ttan98 is offline ttan98  Australia
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thanks everyone particularly, Burnedfingers for a worthwhile contribution.
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Old 21st June 2007, 07:46 PM   #10
radio28 is offline radio28  Hong Kong
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I have built both too,
I can't find any difference in sound quality between them.
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