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Old 30th July 2011, 04:46 PM   #1921
Bonsai is offline Bonsai  Taiwan
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Wow Cecco - what can I say - that is truly a wonderful job. You have inspired me to finish my pre-amp off.

Fantastic.

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Old 30th July 2011, 04:53 PM   #1922
Bonsai is offline Bonsai  Taiwan
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I'm more than satisfied with the sound, though my aging ears are now troubled with tinnitus. That's why I "downgraded" from my fancy Rowland gear. But I can say that it has great low-end control over my Thiel CS3.6s (2 ohms!), not a trace of harshness, and a pleasing soundstage.

Look up transitional miller compensation here on DIY; it's also well-explained in Bob Cordell's book. The idea is to derive feedback from the final output for as wide a bandwidth as possible, thus reducing HF distortion (I got a factor of 5 improvement at 20 kHz). In my design, R9 and C4 set a "crossover" at 617 kHz, above which feedback comes from the VAS output. That avoids the extra phase shift in the output stage. It does take a bit of fiddling, and there will always be tradeoffs, but I'm very happy with the results.

-Gary

Wow - that is a wonderful looking amp!

Nice elegant circuit and great execution - wonderful stuff.

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Old 30th July 2011, 04:58 PM   #1923
Bonsai is offline Bonsai  Taiwan
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I have not looked around this part of the forum for awhile, but the standard of workmanship has really come up over the ladt year or so - some very good stuff indeed!
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Old 30th July 2011, 05:05 PM   #1924
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Originally Posted by sakis View Post
federman even though i have to say that this is a pretty neat and clean job and box is really heavy metal made i wonder if cooling is efficient enough

Material is 10 and 20 mm aluminum. In power 2x300W/4Ω temperature is less than 70 C. The Case is black, then the temperature will be lower. In front of the room for preamplifier.
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Old 30th July 2011, 05:11 PM   #1925
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Material is 10 and 20 mm aluminum....
Very nice job indeed... impeccable layout.

Bonsai... I agree. The standard of some of the builds on here are outstanding.
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Old 30th July 2011, 07:14 PM   #1926
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With the transformer, which you declared at your pages ( from DPA 380 ) you can't get the output power 2x300W, Federmann...and norm for the consumer electronic says, that any part touchable by finger, can't have the temperature higher than 60C... personally I really doubt that this case can cool this output power down...enthusiastic voices of yours, gentlemen, aren't right...
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Old 30th July 2011, 07:30 PM   #1927
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You are right DPA380 is overheated, and turn off, as it is written here http://i.imagefra.me/2e4igrg5.jpg My HQQF but treads perfectly.
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Old 30th July 2011, 07:44 PM   #1928
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I'm not talking about 380, Federmann...read again...
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Old 30th July 2011, 08:02 PM   #1929
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But I can read about DPA380, after several minutes of loud traffic overheats and shuts down. Transformer very noisy, etc.

My transformer is not noisy, my amp can withstand continuous operation loud.
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Old 30th July 2011, 08:40 PM   #1930
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Yes Federmann...it was in early ninetieth...and maybe hence this amp have here so much people, probably they likes this overheating...
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