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Old 15th April 2007, 09:34 AM   #41
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Good of you to keep this thread alive, Parsecaudio.

The M-510 is one of few (high power)power amplifiers i've seen that has matched Re values.
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Old 18th April 2007, 09:47 AM   #42
erajoma is offline erajoma  Sweden
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Default Difference M-510,508 and 5099?

Anyone that have studied the difference in design between 508,510 and the older 5099?

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erajoma
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Old 16th November 2008, 07:51 PM   #43
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Hello Lubbie,
Notice this is really old thread, but if you are still around,
I Would certainly appreciate copy
odaatls-at-that-hotmail-dot-com place

I tried the link parsecaudio posted and it comes up with a bunch
of japanesse stuff in sidebar, but main page not available
"cannot find server" on bottom address bar.
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Old 17th November 2008, 08:35 AM   #44
h_a is offline h_a  Europe
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Hi,

try again parsecaudio's link; it's an american site (no japanese there) and the file is still available.

Have fun, Hannes
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Old 26th September 2009, 05:06 PM   #45
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The service manual for the Onkyo M510 is available for download here:
http://www.hifiengine.com/manuals/on...-integra.shtml

You must register to download. I have downloaded several manuals on 2 different computers without issue. Good stuff there.
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Old 26th September 2009, 05:23 PM   #46
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Here's some good info on the M510, including this:

"The secret inside lies in the two secondary transformers (there are six in toto) : these are "In Phase" transformers which echo the Signal In-Phase Filters of the Integra P-308 high-end preamplifier. In Phase transformers are to cope with the reactive load of loudspeakers, and not only their resistive aspect ; these transformers are to avoid the phase shift between voltage and current in the amp-to-speaker signal path.
Most pronounced around the speaker's resonance frequency, this phase-shift also happens between the voltage and the charging current in the amplifier's power supply ; these charging currents may start fluctuating along the low-frequencies contained in the musical signal. Out-of-phase charging currents can generate electromagnetic flux which in turn often induces voltages of the same incorrect phase in the nearby driver stage (through which the audio signal passes) ; the problem is then, naturally, sent to the loudspeaker... muddy bass and blurry soundstage.
Real Phase transformer are inserted between the positive and negative charging currents of the the power-supply and the capacitors : as the positive and negative currents pass through the transformer's two windings, unwanted peaks and dips cancel each other out - in phase ! You can see the schematic of the Real Phase system by clicking the "more" button below - "

http://www.thevintageknob.org/THEVAULT2/M510/M510.html#

Schematic of where the "real phase" xfmrs are inserted is shown, also.
http://www.thevintageknob.org/THEVAU...realphase.html
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Old 25th October 2009, 07:33 PM   #47
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Isn't it just a large common mode choke?
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Old 27th October 2009, 01:07 AM   #48
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This amp is overly designed. The signal path has more stages than a locomotive and the protection circuit would put a medical equipment engineer to shame. It is obvious that the designer of this amp does not subscribe to the minimalist principal. With each additional component the risk of failure goes up. I bet you this amp has one of the highest rate of failure among power amps. Don't try fixing this amp especially if the failure is in the protection circuit. I once came across an auction in eBay for one of this amp. The amp was brand new but was missing a power board. One of the amp came back for a warranty repair and the technician simply replaced the defective board with one that came from a new amp.
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Old 27th October 2009, 04:50 AM   #49
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Quote:
Originally Posted by coloradosound View Post
Isn't it just a large common mode choke?
No! They are what they said they are!
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Old 27th October 2009, 04:56 AM   #50
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Quote:
Originally Posted by caesar148 View Post
This amp is overly designed. The signal path has more stages than a locomotive and the protection circuit would put a medical equipment engineer to shame. It is obvious that the designer of this amp does not subscribe to the minimalist principal. With each additional component the risk of failure goes up. I bet you this amp has one of the highest rate of failure among power amps. Don't try fixing this amp especially if the failure is in the protection circuit. I once came across an auction in eBay for one of this amp. The amp was brand new but was missing a power board. One of the amp came back for a warranty repair and the technician simply replaced the defective board with one that came from a new amp.
With the older amplifier design especially the ones that uses High Speed BJTs instead of today's MOSFETs, there will be very complicated driver stages as well as the overly designed DC protection and biasing circuitry. But this amp does not have high failure rate. But there are only about 100s in the U.S and they are all over 20+ yrs old, I think it'll be fairly reasonable to assume 3-5 of them on a Tech's Bench at any given time.

I got to say, this is one of the good sounding amps that sounds closer to neutral (subjective) than most of today's MOSFETs amps. I guess mine is about time for recapping the power filters and some lytics in the input lines.
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