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Nikko Alpha 220

Stereo Power Amplifier (1980-81)

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Nikko Alpha 220


The Alpha 220 features DC servo high-speed switching circuitry.

Power output is 120 watts per channel RMS, both channels driven into 8 ohms, with no more than 0.008% total harmonic distortion.

Advanced circuit technology includes parallel push-pull output, dual vertical peak power display, quick responding protection circuit and a rack mountable design.


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

Frequency response: 10Hz to 100kHz

Total harmonic distortion: 0.008%

Damping factor: 60

Input sensitivity: 1V

Signal to noise ratio: 105dB

Dimensions: 482 x 138 x 344mm

Weight: 13.5kg


service manual (low res)  English -

service manual (imp scan)  English - Ivy Caudieus

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Reviewed Aug 17th, 2015 by martymotion

Have this unit new since 1980. Always performed, never a problem. solid unit.



re: Alpha 220

wherE is the fuse located on the A220 DC POWER AMP

re: Alpha 220

Just follow the mains lead and the main fuse is the first thing the power goes through inside the amp. The schematic is quite poor, but you can also see two further fuses close by, after the transformer.

re: Alpha 220

I own one of these amplifiers and through a set of JBL 4411 speakers, with a Beta 20 preamp driving it, this amplifier sounds really nice. Tight, controlled bass, accurate mids and very extended highs, but with out any shrillness. With this system I am using a Marantz CD player as well as a Technics turntable with Grado Gold cartridge. I am also using DH Labs BL-1 interconnects (DH Labs Pro Studio for the turntable) and DH Labs T-14 speaker wire. This amplifier, coupled to the Nikko Beta 20 preamplifier, sounds about as good as anything in the under $4,000 price range for a preamp and power amp. I work in a hifi shop that carries McIntosh and the Mac stuff does sound a tad bit better. A little more open and deep, but the differences are subtle. Let's just say that I have no problem living with my Nikko system, even though I have access to some really high end systems at work. Are the Nikko components the best of the best? no, but they certainly are a cut above most all of what I have heard in their price range. Compared to most all consumer audio home theater receivers out there today, these Nikko components are much better sounding.


I´m the owner of this specifik Main-Power-Amp.

It has 2 feet´s in the input-deffirental amp. It can run in DC.mode in the input.

Data is fine. It´s plying very vell . The ic-current in output stage (restcurrent) shuld be set a sligter higher for better

Qality. After setting at stable current 40-50 ma (take care) !

It will become somewhat hot. All resistors is only old carbon´s type.

the amplifier sounds mutch better After Replacing To metallic resistors ! Not all resistors need chanced,but with indput-trans.!

Feedback resistor´s is chanced a littel bit. for higher gain.-Db.

But take very mutch care! one falt can damade the Amp.


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