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Old 29th November 2008, 01:30 PM   #1
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Default Ultra AMP

What think about this amp?
http://www.pcpaudio.com/com/ultra-amp/ultra-amp.html

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Old 29th November 2008, 03:11 PM   #2
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I have the previus (little brother) version, the SC-R, it's very very good indeed!
Awensome transient response it's ultra fast! but the author said that the ULTRA is the best.
Cheers
Iván Francisco
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Old 29th November 2008, 08:47 PM   #3
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Looks interesting! Would be nice to see the schematics, seems to use some kind of sliding bias current arrangement to make the output FETs operate in Class A without the huge heat dissipation.

That in combination with error correction would be potentially brilliant.

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Old 28th January 2009, 02:08 PM   #4
jkeny is offline jkeny  Ireland
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Yes, any more information on these amps - from the site looks like they're sold as kits?

Ivan, did you assemble yours, good instructions, what price?

As Rikard said, some possible innovative technology in this amp - could be brilliant.

here'a a google translate of some info
Quote:
There is an overall negative feedback loop. However, there are two partial ties encompassing two blocks voltage gain, so they are better than figures in the usual C FB but temporary distortions that lead to a single stage gain, and its consequence is a very high respect for microinformación.

Of course, all the amplifier from the input buffer to the output stage is perfectly symmetrical, giving it very low distortion figures, and still lower than usual because the contribution to the distortion of the output stage is negligible, 50 times lower than usual. This is due to a topology that allows the two power transistors operating in Class A, but with a significantly lower power consumption
Here's the original technical pages in Spanish which goes into a lot more detail of the technologies used in the amp. http://www.pcpaudio.com/com/ultra-amp/ultra-amp.html

Edit:Oops that's the same as the link at top. Interesting pcb tracks with no angular turns - shows an attention to detail
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Old 28th January 2009, 03:30 PM   #5
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Hi Jkeny:
I bought 6 stereo amps from this guy, like I said before little version SC-R. I paid 1.000 euro discount price. I have no schema, no more technical information than the web site, all the data is in Spanish, I suppose that he want to keep the secret of his formula.
The sound is very accurate, fast highs, clear crystal mid's and good deep bass. As you see in the picture I use them in 4 way active mode (sub, woofer, mid & tweet) with balanced input (diy made). The other 2 amps are just in case. The cabinet is temporary (2 years) in development...jaja!
Cheers
Iván
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Old 28th January 2009, 04:04 PM   #6
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I can not find the schematics.
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Old 28th January 2009, 04:57 PM   #7
jkeny is offline jkeny  Ireland
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Thanks Ivan,
These were pre-built, I presume. What did you have before/compare them to?

Good price - what discount did you get - there are no prices on the site?
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Old 28th January 2009, 05:05 PM   #8
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Sound interesting! How much each kit cost? per channel?
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Old 28th January 2009, 10:12 PM   #9
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the PCB is a piece of modern arts!
This makes this amplifier interesting.
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Old 28th January 2009, 10:41 PM   #10
jkeny is offline jkeny  Ireland
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It is a fascinating pcb with traces that you could stare at for hours or is that just the uber geek in me coming out?

I wonder what board layout s/w was used or was this manually laid out? Seem too complicated for manual layout!
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