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Old 12th February 2013, 03:17 PM   #1
Tyimo is offline Tyimo  Hungary
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Default Accuphase amps

Hi!
Accuphase amps are famous about the low impedance driving ability.
How could be that (for example the E-550), a Class A amp can drive 2 Ohms speakers with 120 Wats, but the PSU idle is only 200W?

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Tyimo
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Old 12th February 2013, 06:31 PM   #2
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Simple: it's class A only into 8 ohms.
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Old 12th February 2013, 06:56 PM   #3
Tyimo is offline Tyimo  Hungary
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Thanks!
Clever marketing....
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Old 12th February 2013, 07:20 PM   #4
kouiky is offline kouiky  United States
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As the load impedance is decreased, the proportionate current demand by the load is increased for the a constant decibel magnitude from the loudspeakers, respectively. Thus, as net Power output is increased for higher listening levels, the amplifier moves into Class AB on transients or for the portion that exceeds the quiescent current. That is the key consideration, it would be at high listening levels and does not necessarily imply any sonic degradation. Yamaha and Accuphase share many design similarities and the same components, both of their higher offers being able to drive a lower relative impedance and reactive load.

Last edited by kouiky; 12th February 2013 at 07:23 PM.
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Old 13th February 2013, 06:08 AM   #5
Tyimo is offline Tyimo  Hungary
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Quote:
Yamaha and Accuphase share many design similarities and the same components
Really? Which Yamaha model do you mean?
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Old 27th February 2013, 01:18 PM   #6
Tyimo is offline Tyimo  Hungary
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Anyone know ACCUPHASE based KIT or Clone amplifiers?
Or a full and detailed schematic?
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Old 27th February 2013, 04:41 PM   #7
MiiB is offline MiiB  Denmark
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many Accuphase schematics available on Audio Circuit Denmark
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Old 27th February 2013, 06:45 PM   #8
Tyimo is offline Tyimo  Hungary
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Thank you!
Unfortunately those amps are built with power transistors.
I am looking for Accuphase with Toshiba Power Mosfets. Like A-20V, E-550 or E305V.
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Tyimo
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Old 1st March 2013, 09:15 PM   #9
kouiky is offline kouiky  United States
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Quote:
Originally Posted by Tyimo View Post
Really? Which Yamaha model do you mean?
They're not widely known in the audio world. Yamaha made two lines of gear to commemorate its 100th anniversary and the two amps were the Titanium Centennial edition MX-2000 and MX-10000, but the AX-2000 receiver, the tuners, cd players and preamps in these series also contain internals that resemble Accuphase's work to some length. They're 26-27 years old and still look state of the art in and out, like Accuphase did at the same era and both amps can drive 1 ohms. The board layout of each brand was remarkably similar. They sourced their Mosfets, relays and chipsets from the same suppliers. Yamaha, however, used Black Gate and Rubycon capacitors. I often wondered if Yamaha contracted Accuphase to build the chassis and case work to their specifications, as retooling to make two limited edition product lines would have cost a fortune and been unnecessary, while Accuphase Japan could have been already equipped for the metals work. Oh well, its just a guess.

Below: Accuphase amplifier module.
Click the image to open in full size.

Below: Yamaha MX-2000 amplifier module.
Click the image to open in full size.
Below: The chassis underneath is all copper alloy.
Click the image to open in full size.
Click the image to open in full size.

Click the image to open in full size.
Click the image to open in full size.

Even their preamps have internal visual similarities not seen today outside of costly gear.
Click the image to open in full size.
Click the image to open in full size.

Last edited by kouiky; 1st March 2013 at 09:36 PM.
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Old 2nd March 2013, 10:11 AM   #10
Tyimo is offline Tyimo  Hungary
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Thanks!
Very interesting!
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