全平衡放大另–好處是可以容易提高amplifer output power, eg. single end 放大的 amplifier, 要做出300W output power, power supply DC voltage 要+-80VDC, 而 Full balanced amplifier 的 power supply DC voltage 只要+-40VDC 便可以了！這對輸出ェ率管的耐壓要求也低–點.
Musical Fidelity claim that:
The AMS50 takes a fresh approach to power amplification. It’s a pure Class A design that also takes inspiration from our flagship 1kW TITAN power amp.
Our 30+ years of amplifier experience leave us in no doubt that the ultimate musicality is offered by Class A power amps, with pure Class A designs providing the very peak performance. But pure Class A is only part of what makes the AMS50 so special; it also benefits from the years of research and development that went into its remarkable TITAN big brother.
Of crucial impact is its fully complementary, balanced, bridged circuit design. We believe the AMS50 to be the first ever 50 Watt pure Class A amplifier using this bridged configuration. The resulting advantages are significantly lower distortion and greater power-supply noise rejection.
epic 發表於 2013-9-30 17:54
正在幫朋友修理的N年前金仔P102, 50W Class A, Fully balanced amplifier, 內置四份獨立的amp, 分別給R+ R- ...
Accuphase, my mostly respected brand of home audio equipment manufacturer.
Reason - I think it should be the rare (may be the only one) brand that is willing to show their every product design block diagram clearly in their product spec. This approach can let the customer to understand their product spec on the design change from one model to another. That means at least customer would know what he paid for what he buy from Accuphase products.
Beside for discussion of a balance design is true or not, I would like to raise one inquiry related to the practical limitation for using "true" balance design in home audio equipment.
For true balance design in home audio application, I can understand the meaning when using it in the area related to digital source domain such as CD player or DAC because it would be more easily to achieve in the design for generating an identical +ve and -ve analogue source signal simultaneously (that is from DAC non-inverted and inverted digital output) for subsequent "true" balance amplification but for pure analogue source domain, I can hardly understand how this can be done say starting from the phono stage (signal generated from the cartridge) to create simultaneously true +ve and -ve analogue signal source for later "true" balance amplification. Any Ching can advise.
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發表於 2013-9-30 12:30:35
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