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Old 11th January 2006, 07:02 PM   #1
tempoct is offline tempoct  United States
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Default Question about T-amp

Hi,
My first post
I am thinking about buying a t-amp and mod it (SI 5066). What do you think of doing that compared to build a new one like AMP3?
I searched through the forums and found mix opinion. Did a lot of reading in the past couple days. I'm leaning toward to get the SI since it might be quicker. I'm planning to get/build a higher power t-amp later.
I was away from DIY audio for 5-6 years but I still have confident on my solder
BTW, I've just purchased a Polk Audio R15 bookshelf. Would it be a good match? There were promotion and I got the speakers around $70 shipped.
tempoct
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Old 12th January 2006, 12:19 AM   #2
Pano is offline Pano  United States
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If you want to build one, get the AMP6. It sounds great - much better than the little Sonic - and it is very easy to build. Has a power supply onboard. You just need a transformer. You'll love it!

The AMP3 can be a tough build. All SMD. You may kill your 1st one, many of us did.

The Polk R15should be a pretty good match. But you'd be better off with about 6dB more sensitivity. 89dB/watt is kind of minimum. But it works for a lot of people.
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Old 12th January 2006, 07:41 AM   #3
tempoct is offline tempoct  United States
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I'm thinking about that too. Read through many threads it seems nice.
I am actually wanna built the whole system for my 7.1CH home-made HTPC. I was going to try to modify the sonic first but maybe I could just go for the amp 6
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Old 12th January 2006, 12:17 PM   #4
Pano is offline Pano  United States
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Yeah, do the AMP6. You'll have hair left and your family will talk to you after you complete the project- unlike with the Sonic Impact

You'll spend a few (but only a few) more $$, and you'll have a MUCH better amp in the end, and it might even work!
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Old 13th January 2006, 10:07 AM   #5
tempoct is offline tempoct  United States
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I'm very close ordering the AMP6 right now.
One question about PSU. Seems like the onboard PSU circuit is a regular linear one. I'm thinking that maybe we could mod it to use a switching power supply? It seems to be quite easy to get one these days. For instance, most laptop PSU are small SWPS anyway. Maybe we need to do a little more filtering but those PSU should be quite good quality since it's design to use with computer (never plug in to see the wave form though )
What do you think?
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Old 13th January 2006, 11:20 AM   #6
Pano is offline Pano  United States
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With a good transfomer (I use a 16V 3.5A) the onboard regulator works very well -strong and clean. It allows the chip to work within 1 volt of supply voltage. Very good! Having the regulation so close to the chipseems smart, too.

The SMPS work well. I use them. But for the AMP6, I doubt there would be any gain. Might be noy be as good as the onboard.
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Old 13th January 2006, 07:39 PM   #7
tempoct is offline tempoct  United States
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Maybe I have to try the AMP3. I love the small size and flexilbility of PSU.
Sooner or later, I'd have to run into SMD board I'm not so newbie when coming to soldering.
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Old 19th January 2006, 01:25 PM   #8
Tintin is offline Tintin  Sweden
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I have been thinking along the same lines as tempoct. I planned to use a computer PSU as a switching power supply and considered Charlize, AMP3 or AMP6. The SMD components is a bit intimidating but so is also the comment on diyparadise.com:
======= quote ======
Charlize is a Tripath Class-T amp based on the excellent Tripath TA2020. After mucking about with various Tripath chips (TA2021, TA2022, TA2024), the 2020 won us over by a large margin (like Charlize!).
======= quote ======
The AMP3 is based on the TA2021 while the AMP6 is based on TA2020...

Regarding conversion of AMP6 for SMPS. Would this not just be a matter of bypassing the circuit on the board?

I would assume that I can run a computer PSU without fans considering the small load a tripath amp would make? This would make for a very cheap solution since computer PSU's can be found aplenty in wastebins here and there.
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Old 19th January 2006, 05:08 PM   #9
GJF is offline GJF  United Kingdom
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I've got a modded S.I. (Silmics for smoothing mounted on the chip pins, Starget input caps, O.F.C wiring, little Alps pot and reboxed with gold phono's and binding posts)

Have an Amp 3 also. (Nichicon Muse input caps, Neotech 6N O.C.C. wiring, larger box than S.I. with gold phonos, 4mm speaker sockets, same little Alps pot and switching and inputs for 4 sources and tape monitoring.

Both used with a linear 12v psu and extra 4700uf of Elna Gold Tune smoothing caps, the Amp 3 wipes the floor with the S.I.
The gain on both is the same and the S.I has had the input mods as per Panomaniac's site. Also have a Skynet SMPS from Nuuk with extra 10,000uf of smoothing caps.

Result?

No contest after a very prolonged burn-in period. The Amp 3 walks it on all counts.
More of everything and very easy to listen to for long periods.
Very revealing of sources without favouring one over the other. I use a little QED phono stage that has been modified and vinyl never sounded so good!
Less grain with the Amp 3 and that often talked about inky blackness during silent pieces.
Wasn't always the case though, my first Amp 3 chip went awol and prior to the rewire with the Neotech and Muse caps it could be a little 'thin' sounding.

From experimenting it would seem that these little Tripath based amps are very revealing of the components used in their construction, something I've noted before only with tube amps.

On the subject of supplies, I've used the two above and a sealed lead-acid battery and much prefer the linear supply.
Odd, given that the linear is only rated at 1.2A.

So pleased with the Amp 3 I am (as Yoda would say) that for now I have no inclination to change anything on it or upgrade for that matter.
I would have no hesitation in reccomending the Amp 3 if one could overcome the surface mount phobia, even I managed to get mine to work first time!
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Old 19th January 2006, 06:32 PM   #10
tempoct is offline tempoct  United States
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I ended up order an AMP6. Anyway, if it works out well, I might order multiple Amp3 to create my 7.1 system
(still, have to think which amp to use for the ".1" in the system)

BTW, I read DIYParadise quoting that the SMD component sounds better.... what do you think of that? Yeo claim it's due to the nature of high frequency switching on Class-D that make the smaller components count.
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