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Old 4th March 2004, 06:33 PM   #11
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How is tge Gigant2000 soundwise, let's say compared to AlephX ? I understand that it uses a very similar topology as the latest Accuphase products...
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Old 4th March 2004, 08:41 PM   #12
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Itís a bit of an odd story and Iíll try to be brief.
When I build the Ď2000 I was rather impressed with the sound, not only because I build it but I did a major upgrade on the speaker system at about the same time.
Before the Ď2000 I listened to a Phase Linear 700 connected to a pair of B&W802 series1.
Only a few days before the Ď2000 was finished I had the opportunity to buy second hand B&W800 Matrix. So the first impression I had with my new speakers was with the Ď700.
A week later or so I finished the Ď2000 and listened for the first time to my completely new system.
At first I noticed much more detail and clarity. And the amp has guts. I ones pushed it to the limit and I must say that it went loud, real loud. Luckily, these Ď800 can have something like 800W per speaker. You should hear Sinead OíConnorís The Emperor's New Clothes drumsÖ hmmm.
There was however a major lack in the bottom end. The bass was simply not right.
I did blame it on the room, which is very unusual and really not good for sound.
I never bothered and so I continued listening to the Ď2000 until I build the AlephX.
The first listening sessions with my new born amps were simply impressive compared to the Gigant.
All of a sudden everything was there: the sparkling highs, the clarity of the voice and the low bass I could expect from the B&W800ís. Yes, they really can go as deep as 20Hz!
Now, the only conclusion I can draw for the moment is that I must have connected both channels of the Gigant out of phase.
Until now I never reconnected him to compare and really listen if this was actually a mistake.
I will, one of these days because now you guys beat me to it.

One little warning though: Itís not a beginners project. I was very lucky that everything worked well from the first time. I didnít have to debug one single part of the amp. Second reason could be that I worked almost six months on that project before soldering one component. And third reason could be that itís my job to solder and assemble things.

I promise to reconnect the beast one of these days (weeks) and let you know.

/Hugo
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Old 7th March 2004, 04:21 PM   #13
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Ok, found the time to take some pictures.
All is still wired rather chaotic so bear with me.
The main board on the heatsink, the transistor bank, the big output coil, one channel.
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Old 7th March 2004, 04:24 PM   #14
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The protection circuit:
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Old 7th March 2004, 04:26 PM   #15
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The capacitor bank: 6 x 10.000ĶF.
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Old 7th March 2004, 04:30 PM   #16
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The two toroids, the low noise Papst fan and the rear of the heatsink, half the thickness of what Elector recommends. I never planned to use it in extreme conditions. One channel:
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Old 7th March 2004, 04:32 PM   #17
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Double bridge rectifiers on a heatsink:
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Old 7th March 2004, 04:34 PM   #18
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Complete view. Right PSU (Toroids, bridge and caps) is missing for the moment:
Well, sorry for the mess
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Old 7th March 2004, 04:52 PM   #19
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Very impressive. Thanks for the pictures. Please post as well your revised listening impressions once you found the error.

Conceptually and soundwise, how far do you see it away from the bigger accuphases ? This is what accuphase publiches in their brochures of the P-370:
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Old 7th March 2004, 05:54 PM   #20
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I just reconnected the PSU and wanted to listen a bit but this amp doesn't have an input attenuator. Since I'm too lazy to disconnect my preamp and I always wanted to have such an attenuator for that amp, could someone draw me a simple schematic? Value? How to connect?

Thanks

Blitz, I never had the opportunity to listen to a big Accuphase.
But I heard lot of good things from them. I guess they are still one of the better amps out there.
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