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Old 30th August 2012, 09:05 PM   #2871
alex mm is offline alex mm  Europe
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...... thank you dobrivoje corrected

Regards Alex.
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Old 30th August 2012, 09:58 PM   #2872
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Originally Posted by Lazy Cat View Post
Uff that was I meant, not marketing really
It was clear, but I could not resist to tease you.
May i propose: 'It will rock, since it is SSA, roll for it." :-)

Is your splendid amp even better after some breaking time ? Still happy with the way it sound ?
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Old 30th August 2012, 10:36 PM   #2873
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Alex,
I would like to note a weekness in ground scheme in your PCB drawing.
The input ground should be seperated from the zobel and both should go independently to the main power supply capacitors null point.
otherwize there is a good chance of positive feedback and oscilation from voltage drop on ground line that goes from PCB to main capacitor bank.
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Old 30th August 2012, 10:42 PM   #2874
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Yes Alex, thats the way I would also suggest to be done, separate the input ground to have a separate connection to the star ground.

Cheers, Tony
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Old 30th August 2012, 10:53 PM   #2875
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Yes, if you replace zobel from PCB to speaker terminals, you'll have no problem.
The same thing is for snubber.
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Old 30th August 2012, 10:55 PM   #2876
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BTW, and this is entirely from my own twisted desire, I would add a small parallel cap to the big decoupling cap, say something like a 220uf to use a very low ESR type...maybe lowering the fuse could give enough space for it.
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Old 31st August 2012, 01:46 AM   #2877
naf is offline naf  Indonesia
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Quote:
Originally Posted by alex mm View Post
...... thank you dobrivoje corrected

Regards Alex.
thanks for your correction sir.
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Old 31st August 2012, 08:16 AM   #2878
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Quote:
Originally Posted by Esperado View Post
It was clear, but I could not resist to tease you.
Teaser aaaa

Quote:
Originally Posted by Esperado View Post
May i propose: 'It will rock, since it is SSA, roll for it." :-)
That's a nice one, in short, all what's the SSA about.

Quote:
Originally Posted by Esperado View Post
Is your splendid amp even better after some breaking time ? Still happy with the way it sound ?
As you probably missed it, I sold the SSA to a friend recording engineer, who has control over the whole recording chain, from microphones, recordings, mixing and mastering (two master systems listening/tuning for final master). I was there two weeks ago, because he overloaded 4 A/T mains fuse which blew when he performed some low frequency room measurements, now 5 A/T is in action. Than I had opportunity to listen to some material and the amp definetely become very refined, musical, not loosing its transient response, speed and transparency. It is a good part of the whole mastering system, doing what is suppose to do, not being recognizable in the chain. Very good sound of that system I must say.
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Old 31st August 2012, 10:11 AM   #2879
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Originally Posted by Lazy Cat View Post
... he overloaded 4 A/T mains fuse which blew when he performed some low frequency room measurements
A recording studio is, indeed, the best place to evaluate the reliability of an audio component on the long time.
Did this amp was a symmetrical input version ? Did the symmetrical version brings power supply ripple rejection to the same level than a classical voltage feedback amp ?

Your fuse's story makes-me remember something:
Cabasse ( a well known French loudspeaker manufacture) wanted to demonstrate to me their top line enclosure was able to be used as a studio monitor. I had warned them about the particular constraints of studio work, but they insisted and came to the studio with a pair of baffles. The two enclosures were plugged-in, and the level was tuned to 110db spl, same than my JBL. Then we listened the last mix at normal high level. Everything were fine, until i pushed the "Solo" button of the kick drum track. Instantly, the two dust caps fell on the mixing desk, like dead leaves.

Well, i hope you had ordered all the parts of your master piece in several copies and that you will build - and keep for ever- an other sample of your prototype that nobody here allowed-you to sell !
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Old 31st August 2012, 11:32 AM   #2880
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...... I sold the SSA to a friend recording engineer, ........
With so many permutation and combinations it is hard to say where one is !
What circuitry did this amp use ? Is it on one of the pages of this thread ?
I think you guys who keep progressing from mod to mod have some idea of where you are but those following the thread and intending to try one of the creations could get lost.
If you have compared a particular scheme in the studio, which one was it.
You started a great thread . It really got CFB fans worked up ! My preferred amps are all CFB here.
Cheers.
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