Yamaha MX 1000
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Great amp. :thmbsp: Can't go wrong with it. Generally see them selling in the $4-500 range, which seems more than fair.
the-real-mandak
Super Member
In Europe they go for a little less than the M-80's and 85's, since it doesn’t have a real class a function/mode.
A German review compared it with the Luxman M 03; the Yamaha has a bit more bass, but the Luxman a little more clear sound. They also measured the MX-1000 to deliver 2x380W@8ohm, 1 KHz, 1% K, 2x660W@2ohm. It is a powerful amp.
Recently there was a lucky guy who got one for 205€ on epay, I am sure he still has his arms up
A German review compared it with the Luxman M 03; the Yamaha has a bit more bass, but the Luxman a little more clear sound. They also measured the MX-1000 to deliver 2x380W@8ohm, 1 KHz, 1% K, 2x660W@2ohm. It is a powerful amp.
Recently there was a lucky guy who got one for 205€ on epay, I am sure he still has his arms up
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I sold one a while back on Epay for $650.
I did like the amp but it was a PITA keeping the lights working.
I am no expert but the way I understood it this was a full class A amp while my MX 800 was class A only up to about 20 WPC.
Very neat power graph and digital read out if you can keep the bulbs lit.
Gary
I did like the amp but it was a PITA keeping the lights working.
I am no expert but the way I understood it this was a full class A amp while my MX 800 was class A only up to about 20 WPC.
Very neat power graph and digital read out if you can keep the bulbs lit.
Gary
MX-1000 and MX-800 work the same way. HCA bias control circuitry takes it out of Class A as the power output demand goes up. If the MX-800 is good for 20wpc before starts getting biased into Class A/B then the MX-1000 is probably good for up to 30wpc before doing the same thing. But, I was unable to get any defiinitive response from Yamaha about the opeation of the HCA circuitry when I asked them about same a couple of years ago.
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the-real-mandak
Super Member
No, I don't think so. They MX- series all use Yamaha's Hyperbolic Conversion Amplification Circuit.
It is a little unclear, what the MX- series does regarding class A. I found this at Audioholics:
"I have been monitoring this forum with much interest and rather than adding my own 2cents, I sent a quick email to Yamaha USA Products Director Bruce Bernstein. *He has given me permission to reprint this in this forum.
Quote
The RX-Z1 is a Class AB amp, and does not use HCA circuitry. It does have a beefy power transformer and filter caps, but the amps are all Class AB.
The MX-1 and MX-2 and MX-1000 were Class A amps, and utilized the HCA circuitry. The transistors used a sliding scale bias circuit, and they were always on, regardless of power output...
I hope this helps add usefulness to your debate.
This is not a knock on the fabulous RX-Z1, just meant as a point of clarification. *I trust Bruce as a very reliable source and I haven't been able to prove him wrong yet since my initial dealings with Yamaha over four years ago!
Quote
HCA (HYPERBOLIC CONVERSION AMPLIFICATION)The Yamaha developed HCA circuit goes a step beyond the conventional Class A amplification generally used in a high performance amplifier. In a Class A amp, when output exceeds a limit determined by the idling current, operation degrades to Class AB, resulting in increased crossover and switching distortion. With the HCA there's less distortion and less heat generation.
Please note also that Yamaha does not explicitly state that their HCA designs remain in Class A at full power. They just state that the crossover distortion due to switching over to Class AB is less than most amps due to their proprietary circuit. I seriously doubt the amp remains at true Class A at full power. It would be too inefficient. Very few high end amplifier vendors produce fully class A amplifiers, and they are usually quite heavy, big, expensive, and produce 100watts rms per channel or less."
http://forums.audioholics.com/forums/showthread.php?t=300&page=3
But a fact is that they don't Wright anywhere that they are class A, it is a little like listening to a politician telling the "truth". I must say I’d like some from the technical department explain it.
It is a little unclear, what the MX- series does regarding class A. I found this at Audioholics:
"I have been monitoring this forum with much interest and rather than adding my own 2cents, I sent a quick email to Yamaha USA Products Director Bruce Bernstein. *He has given me permission to reprint this in this forum.
Quote
The RX-Z1 is a Class AB amp, and does not use HCA circuitry. It does have a beefy power transformer and filter caps, but the amps are all Class AB.
The MX-1 and MX-2 and MX-1000 were Class A amps, and utilized the HCA circuitry. The transistors used a sliding scale bias circuit, and they were always on, regardless of power output...
I hope this helps add usefulness to your debate.
This is not a knock on the fabulous RX-Z1, just meant as a point of clarification. *I trust Bruce as a very reliable source and I haven't been able to prove him wrong yet since my initial dealings with Yamaha over four years ago!
Quote
HCA (HYPERBOLIC CONVERSION AMPLIFICATION)The Yamaha developed HCA circuit goes a step beyond the conventional Class A amplification generally used in a high performance amplifier. In a Class A amp, when output exceeds a limit determined by the idling current, operation degrades to Class AB, resulting in increased crossover and switching distortion. With the HCA there's less distortion and less heat generation.
Please note also that Yamaha does not explicitly state that their HCA designs remain in Class A at full power. They just state that the crossover distortion due to switching over to Class AB is less than most amps due to their proprietary circuit. I seriously doubt the amp remains at true Class A at full power. It would be too inefficient. Very few high end amplifier vendors produce fully class A amplifiers, and they are usually quite heavy, big, expensive, and produce 100watts rms per channel or less."
http://forums.audioholics.com/forums/showthread.php?t=300&page=3
But a fact is that they don't Wright anywhere that they are class A, it is a little like listening to a politician telling the "truth". I must say I’d like some from the technical department explain it.
