Aleph Power Output Stage & Halcro Error Correction Front End - what about this ?? - diyAudio
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Old 15th December 2011, 10:50 AM   #1
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Default Aleph Power Output Stage & Halcro Error Correction Front End - what about this ??

Single ended output power stage include Halcro error correction:
Exist such an approach already as a diy project or as a commercial product?

Thank you for advices.


some URLs:
halcro amplifier
SoundStage! Ultra Audio - Halcro dm58 Mono Amplifiers: A Whole New World from Down Under (6/2002)
Halcro dm38 power amplifier | Stereophile.com
UcD400 listening vs. Halcro & Gamut
Halcro
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Old 15th December 2011, 11:41 AM   #2
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1. you are trying to mix two extremes - efficient SE , and error correction
2.that's more issue for Solid State forum ; if you take a good look in recent happenings here at Papaland , everything is going in direction of invoking proper ratio of harmonics in THD spectra , not in killing all THD
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Old 15th December 2011, 01:33 PM   #3
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Quote:
Originally Posted by Zen Mod View Post
1. you are trying to mix two extremes - efficient SE , and error correction
2.that's more issue for Solid State forum ; if you take a good look in recent happenings here at Papaland , everything is going in direction of invoking proper ratio of harmonics in THD spectra , not in killing all THD
This I know all.

Single ended Class A mode eliminates most of the higher order and all complex components - thus for such an error correction it is an easy task to reduce all low order THD components from the single ended output stage down to rather immeasurable values.

With help of such an amplifier (i. e. SE output power & Halcro error correction) it is possible, which exactly audible effect is perceived while a listening test in case of completly absense of any THD and in case of the presence from a proper ratio THD, consists of mainly second/third order harmonics.

Perhaps one of the member have already investigate this (much more helpful than the endless debates concerning the sonic character of various amplifiers with completly various topologies and different boundary conditions like various solutions for PS-transformers/rectifiers/caps and GND management/earth wiring).

In the moment I observe two main groups of guys resp. two opposite kind of claims:

1) Good sound is only to achieve, if all THD components (i. e. even low order like second order) are extremly low - at best immeasurable values. In other case the reproduction sounds beautiful and more musical, but less realistic.

2) Good sound is only to achieve, if additional a certain degree of low order THD is present, because otherwise an audible over-analytic impression so as harshness (particularly by hard spoken "S") is perceived as a nuisance.

Last edited by tiefbassuebertr; 15th December 2011 at 01:51 PM.
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Old 6th December 2012, 09:30 AM   #4
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any news?
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Old 7th December 2012, 05:53 PM   #5
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Quote:
Originally Posted by tiefbassuebertr View Post
any news?
Your proposal in Post#1 is interesting. Zen Mod made an excellent point regarding the need for some level of output distortion and balancing its good harmonics to get the great sounding FW amps.
I am under the impression that Aleph is initially created as a current source amp. Maybe ACA is such an example. Its output impedance is ~10 Ohms before loop feedback. It drops to < 5 Ohms after loop feeddback.

If you have the desire to further lower the distortion and output impedance of a current source amp, then one possible approach is to mate it with an "ideal" voltage source amp . This approach is found in the Pass Labs Forum, in the thread which is entitled "Compound Power Amplifiers". It may help test the hypotheses you wish to understand with a minimal diy.
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Old 7th January 2013, 04:34 PM   #6
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Where I must ask for schematic and service manual of Halcro's DM38 ??

http://www.harman-japan.co.jp/halcro...8/img/ph01.jpg
http://www.audiooutlet.co.kr/ao/boar...10023&ishtml=n

Last edited by tiefbassuebertr; 7th January 2013 at 04:44 PM.
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Old 7th January 2013, 04:44 PM   #7
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Originally Posted by tiefbassuebertr View Post
Where I must ask for schematic and service manual for Halcro's DM38 ??
I hope that you have a safe, healthy and prosperous 2013. The schematic in Halcro's patent seemed detailed and complete. The service manual?
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Old 7th January 2013, 05:01 PM   #8
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at Halcro ?
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Old 7th January 2013, 05:47 PM   #9
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Quote:
Originally Posted by Antoinel View Post
I hope that you have a safe, healthy and prosperous 2013. The schematic in Halcro's patent seemed detailed and complete. The service manual?
this patent ?
http://www.pat2pdf.org/patents/pat5892398.pdf
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Old 7th January 2013, 06:09 PM   #10
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Originally Posted by tiefbassuebertr View Post
Yes; based on the language disclosing the invention. This patent will expire in 2016; simply add 20 years to the date of its filing.

Last edited by Antoinel; 7th January 2013 at 06:12 PM. Reason: tweak
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