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Nikko Alpha II

Stereo Power Amplifier (1978)

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Nikko Alpha II


Power output: 120 watts per channel into 8Ω (stereo)

Frequency response: 10Hz to 100kHz

Total harmonic distortion: 0.03%

Damping factor: 80

Input sensitivity: 1V

Signal to noise ratio: 105dB


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Reviewed Apr 26th, 2017 by citation16zz

This amp is just as good if not better than my Citation 19! Great power - runs cool with two sets of 8 ohm speakers and the sound space is full and clear and warm.

Rare gem and extremely fun to own and listen to...and highly underrated but hopefully never forgotten again Japan made quality!

Reviewed Jan 13th, 2017 by fuse

Excellent amp. Runs hot, with my difficult-to-power Linn Isobariks. Hasn't been a problem, though.
I would suggest pairing with a warm preamp, source and speakers, as it is on the analytical side, IMO (I'm using a Grado 8MZ, Technics SL-220 belt drive, NAD 3020 as preamp and tweeter amp, and the Nikko to bi-amp the woofers on the Linn Sara 9s).
I use it daily, and have had it for almost two years, and a hum as developed. Time to recap!

Reviewed Oct 25th, 2016 by ghostberry

This is my best amp to date that I have owned. There is no heat issues with my model at all and works and sounds incredible. For $250 CDN this amp was my best purchase and makes a great entry level amp. Built like a tank too and is not as heavy as my Harman Kardon Citation 19 but it performs like a charm you will not be disappointed if you find one, try it out...it is similar in sound and somewhat power to my Nikko 130 which also operates cool.

Reviewed Oct 03rd, 2014 by ivandezande

Picked this up broken and repaired it. Easy job to fix, very modular and everything is robust. Large dual transformers, 20,000uF a channel, and huge heatsinks on the back.
I give this a 8 because it sounds amazing and is durable, but it has some thermal issues with the vbe multiplier, and the driver transistors are not very high quality. The VU meters are beautiful. Wonderful amp to have.



re: Alpha II

I have one of these and the service manual shows a modification to the feedback circuit. I have done the modification to mine, it's just a couple of capacitors.

I will upload my copy with the modification included.

re: Alpha II

Hi Ace,

Have you uploaded your modification yet? I would be interested in seeing it!

re: Alpha II

The modification is in the service manual I uploaded, listed above.

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