This was an amp to which Peter had naughtily added 2% THD. There was also an "experimental" amp included in the test. The amps were his famous Quad II tube amps, his first solid state amp the Quad 303 and one of his current dumping amps a Quad 405-2. The speakers were his Quad ESL 64s, so Unfortunately not your typical speaker load, but not an easy one either. Then there is his infamous double blind study for the golden ears, over the tube solid state debate. I can't think of another amp manufacturer that dared to state that. His amps were guaranteed unconditionally stable into all loads. Nikko Alpha III Amplifier Parting out WORKING RIGTH CHANNEL OUTPUT BOARD. All he could really do was make his output stages, especially his later amps, perform optimally under the widest range of conditions possible and be stable. He told me it was a nightmare investigation and hard to get really useful information. 1982 Nikko Alpha 220 120 watt amp, Beta 20 Pre-amp ,Gamma 20 Tuner, and EQ 20 Equalizer, comes with Monoprice interconnects and Cerwin Vega HT S6 speakers. This is an area that the late Peter Walker did a lot of work on. The amp speaker interface is a not well understood area, and then you have the issue of a huge number of speaker designs all over the map. There's much more than frequency response and thd that may make a difference, I think.Ĭlick to expand.The problem is amps are measured with resistive loads and they are nothing like speaker loads. Whether this is fact or fiction, I have no idea, but it's an amusing storyĪ higher bandwidth will make the phase response more linear within the 20KHz bandwidth, you need very very wide bandwidth to get linear phase response up to 20KHz. I know there's a story about a guy working at Adyton in Norway doing the fine tuning of amplifiers by ear, because the measuring instuments was not fine tuned enough to get it 100% right. There are many other things like TIM and phase response ans others. whether it's this that may make differences or actual compression due to the fact that some speakers require the amp to provide quite significent current loads. Vintage Nikko Alpha III Stereo Power AmplifierDual Mono Mosfet Amp 80 Watts Per Channel 8 Ohms Vintage Nikko Alpha II Stereo Pre-Amp Vintage Nikko Gamma I Stereo FM Tuner Alpha III - Stereo Power Amplifier (1978) Specifications Power output: 80 watts per channel into 8 Ohms (stereo)Frequency response: 20Hz to 20kHzTotal harmonic distortion: 0. The specs published utilizes a resistive load and there are no speakers that present a resistive load, so when you combine the complex load of a speaker, the frequency curve of an amp will not be as flat anymore. The Nikko III worked beautifully with some DIY speakers that I had, that were much more efficient than the Duntechs. Click to expand.No amps are ruler flat at all I believe