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Class D Switching Power Amplifiers and Power D/A conversion

T-Amp versus Gainclone
T-Amp versus Gainclone
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Old 29th September 2005, 11:13 PM   #11
jacklelad is offline jacklelad  United Kingdom
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I understand what you are saying. I just wanted a starting point in terms of understanding whether these options were in the same ball-park or whether there was a consensus that one or the other was clearly superior. Now I know, thanks to everyone's valuable opinions, that they are indeed comparable I can go ahead and make a more informed choice.
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Old 29th September 2005, 11:13 PM   #12
KT is offline KT  United States
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Originally posted by Nuuk
At present I am keeping one of the 2020 amps in my main system with no desire to put back my 'flagship' GC although I will do soon, just to see if I have changed my mind about which I prefer.
You're killing us, Nuuk! Enquiring mind want to know, you know?

This is pure conjecture, and as far as I know Nuuk has given away nothing, but somehow I get the feeling that the 2020 amp in question has a feminine name and is made by a guy who also make a DAC with a feminine name.

I only say that because I've heard some extremely positive comments on this amp by other forum member who's tried it against some other T-amps. Of course, I could be totally wrong and Nuuk could be talking about something totally different... I have a gut feeling, though. Can't wait to find out.

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Old 29th September 2005, 11:27 PM   #13
KT is offline KT  United States
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BTW, I find that running a Gaincard with a tube preamp is the way to go. The Gaincard by itself was really clean and had some good musical qualities to it, but it did sound a tad bit clinical by itself (original version of Gaincard - they've tweaked the circuit to sound sweeter recently). With a properly modded Cary SLP-94, the sound was really musical. Really synergy going on, there. A whole other animal.

I expect that a good tube pre on a T-amp is also really nice.

Can't say which may be better in this context, but I urge anyone using these amps to try it out.

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Old 29th September 2005, 11:40 PM   #14
Nuuk is offline Nuuk  United Kingdom
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I agree that the GC tends to sound best when 'fed' by a pre-amp or buffered stage!

For those of you feeling like young kids on Christmas Eve, I can tell you that the review on TNT should be out very soon now.

BTW the TNT site is currently down. I hope that's not due to you all looking for that class-T review!
The truth need not be veiled, for it veils itself from the eyes of the ignorant.
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Old 30th September 2005, 05:58 PM   #15
filholder is offline filholder  United Kingdom
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Hi ,

I have a pretty damn decent Gainclone setup built using BrianGT/CarlosFM 's Dual Mono Lm3886 kit. All wired internall using silver wire, good caps etc. It is also buffered running through the 3 transistor buffer design on Nuuks site using the described PSU. All in it is a excellent setup IMHO best i had heard at that stage. I then went on a Class-D extravaganza using a stock SI, a heavy modified SI and finally an AMP3. All using a decent quailty SMPS. I like them all though the AMP3 is clearly the better class D. Now unlike Nuuk i have a set of 2 way floor standers which are not that easy to drive, even so i get decent enough SPL with any of the amps though the gainclone have a lot more i reserve.

At the moemnt the AMP3 is in my system and like Nuuk i plan to put my gainclones back in at somepoint to check but for now i prefer AMP3.

They are easily in the same ball park and like nuuk says it is probably more about what type of music you listen to and what the rest of your system does to the music.


Oh so that means next week does it Nuuk, not up thwre now and it gets updated once a week so thats what my moneys on!!
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Old 8th September 2008, 09:06 AM   #16
audiodesign is offline audiodesign  Italy
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Some test about class d amplifiers


Yesterday we have tested also a Gainclone reference with all Caddock
http://www.audiosector.com/ Premium kit

There are many differences on class d amplifiers

The Gainclone have a very smooth sound probably because there is a lot of feedback to compensate the cheap amplifier stage.

The my opinion is: the Gainclone could be better than the best class d only if you use a bad digital source with metallic sound to block.
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Old 9th September 2008, 06:43 PM   #17
GratefulTony is offline GratefulTony  United States
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I guess I can offer my experience on this subject, having buila both a 41hz amp 4 and an audiosector gainclone...

the speakers used in this comparrison were fullrange fostex 166 (phase plugged, enabled) driven metronomes with supertweeters.

12 ga extension cords for speaker cables

AMP 4:

24v linear PS
Very wide and defined soundstage. sounds can seem to come from well beyond the outsides of the speakers, "airy" tonality, but the performers in the soundstage are more like ghosts... they seem to float in space, and have a sort of semi-transparency and lightness... Excellent detail.

2x12v SLA battery power supply
Very dense soundstage, performers sound SOLID, but also seem squished together... Soundstage is set entirley between the speakers. Perhaps more of a strong, solid tone, but also less refined. Less detail, more "emotion" or "oomph"...

Also: the gainclone will not reach as high of volumes as the T amp will with the same PS voltage (24V)
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Old 15th September 2008, 01:08 AM   #18
justblair is offline justblair  Scotland
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I have a 4 way gainclone, the inverted design courtesy of NUUK's site. The stereo pair is fed by a kookaburra preamp, which has BB opamps as buffers.

Just recently I started playing with Sure Tripath TA2024 based boards. With a little modification, they are sounding pretty damn good.

Over this weekend I finally used them with my Mission 753's

Wow! They sound very good indeed. As NUUK mentions above, power supply wise you dont need a lot to run them.

Which is my favourite? At this minute in time, the Tripaths are impressing me loads. I will need to finish off an amplifier and compare them properly but I would not be suprised if I choose the tripath. The clarity they produce is quite incredible. I love the speed as well. Plugging in my Gainclones, they certainly seem smoother, but the top end is not so detailed.

The Sure boards do need some modification, but they are so cheap and even the modifications required dont break the bank (some are even free)

I will write up a comparison on my site eventually, but I have a few more modifications to perform and write up before I put them head to head.
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Old 15th September 2008, 02:49 AM   #19
BWRX is offline BWRX  United States
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I've designed and built both Tripath and LM3875 based amps from the ground up. I like both! If your speakers need more than ~7W to play at the volumes you listen to then go with a LM based amp or one of the higher power Tripath chips. If you have sensitive speakers and/or listen at lower volumes then the lower power Tripath based amps could work nicely.
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