Has anyone compared GC amps(LM3875/3886/4780) with other DIY SS amps(Leach,ESP) ? - Page 3 - diyAudio
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Old 17th October 2004, 02:03 AM   #21
troystg is offline troystg  United States
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Hi Percy-

"Looks like BobEllis did not use BrianGT's PCBs so the missing piece of information is that the pcb was indeed a good design(or otherwise) and free of things that can make a GC sound bad."

Well aside from pwr, it is pretty hard to screw up the final sound when using BrianGT's amp kit. Great sound and I KNOW someone will prove me wrong but I dare say it: idiot proof.
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Old 17th October 2004, 02:07 AM   #22
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Quote:
Originally posted by carlosfm
One can take an LM chip (any of these) and make bad sounding amp.
Guys, don't think it's only the chip that makes the amp.
It's much more than that, it's everything.
Quote:
Originally posted by sss
anyways check this one
Leach vs. LM4780 - listening test
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Old 17th October 2004, 03:46 AM   #23
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hi percy,

as an answer to your question, I have built more than a dozen different gainclones, esp's p3a and the leach amp among other ss amps.

they all have their own character and way of expressing music. of course, the gainclone is the most easiest amp to build.

i won't go into details on what their independent sound is, all i can advise to you is that they are all worth building, worth your time and money, and most of all, fun to build.

best regards,
JojoD
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Old 4th November 2004, 11:44 PM   #24
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I thought that I should follow up.
I pulled my Leach amp out from under my bed and checked the bias. One side was 150 ma and the other was only 50ma.
I rebiased both sides to 200ma and now the Leach sounds much better including the bass.
As of now I am listening to the Leach.
Steve
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Old 5th November 2004, 12:03 AM   #25
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I built BrianGT's boards with the expensive resistors and Panasonic FC caps. I still think my stock AKSA sounds better overall. I prefer the more spacious soundstage the AKSA provides in my system.

It's been said and I agree that chipamps cost+build time/performance cannot be beat.
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Old 5th November 2004, 12:15 AM   #26
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hi Ultrachrome,

Well to be fair, your psu, regulated or not ?. Buffer or not ?. Thanks.

regards
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Old 18th December 2005, 04:27 AM   #27
methar is offline methar  Thailand
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Just to share my experience as the listener, or DIYer.

I had opportunities joinging a couple of audio-lover parties. There were also peter's Premium kits ( with 10K pot), Carlos's alike 2rd version of snubberized PS with his LM3886 design), P3A, and P101. Here are what my friend & I remember:

1). For the tube-friendly speakesr, Peter's Premium kits is the best (except for heavy music like classical rock). High & mid is excellent with great details while bass is more defined & controlled than the Zen V4.

Note, the premium kits was using 22-0-22 center tabbed.

2) Carlos's design also great. Much less sensitive than Peter's premium kit.

3). In most speakers, P3A and Carlos design sound great, however, Bass of P3A seem to be better in heavy music e.g. classical rock, simphony, (IMO).

Sorry if this hurts many of you, however, the P101 (100W version, standard metal films, SCR/WIMA cap. No exotic components ) was directly driven by the same CD player via a POT is the BEST for all types of music and most of speakers there. The sound pretty like the Creek 4330 but much more details and powerful!
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Old 6th January 2006, 07:35 PM   #28
jasonva is offline jasonva  United States
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I have built the BrianGT GC, a Parallel version, a Bridged Parallel version, and the P101. Also, I have 2 Adcom 545 IIs.

The best sound for me is the Bridge Clone (BB DRV 134 + 4 Chips). It just seems to have the best dynamics and lack of color. It does seem to be a bit harsh on some drivers. running it in standard parallel mode makes it a real sweet sounding tweeter amp. Below are the pages where you can see the diferent versions of Gain Clone and the DRV134 prototype.

http://guerrillaaudio.com/store/bunk...M3875Chip.html


http://guerrillaaudio.com/store/bunk...Amplifier.html

http://guerrillaaudio.com/store/bunk...ingModule.html

The P101 is the best mid mid-bass I have ever used. it is powerful and clean.

I am currently building a system that exploits the strength of these amps. An active system with the Parallel clone on the tweeters and the P101 on mids and the two bridged Adcoms on sub duty.
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Old 11th January 2006, 04:02 PM   #29
percy is offline percy  United States
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thanks for everyone's comments on the subject. Please do keep posting your personal opinions in this thread.
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Old 11th January 2006, 04:53 PM   #30
waltona is offline waltona  United Kingdom
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Slightly off topic but....

I built the standard ChipAmp 3875 kit and it is significantly better than my Arcam Alpha 7r (300 amp).

If you are reading these forums and are trying to decide whether chip amps can truely deliver quality then I assure you that they can even using the simplest implementations.
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