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Yamaha A-550

Integrated Stereo Amplifier (1979-80)

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Yamaha A-550


Power output: 40 watts per channel into 8Ω (stereo)

Frequency response: 4Hz to 70kHz

Total harmonic distortion: 0.01%

Damping factor: 50

Input sensitivity: 2.5mV (MM), 150mV (line)

Signal to noise ratio: 98dB (MM), 104dB (line)

Channel separation: 65dB (line)

Output: 150mV (line)

Semiconductors: 45 x transistors, 2 x IC, 21 x diodes, 1 x zener diode

Dimensions: 435 x 117 x 338mm

Weight: 7.8kg


instruction/owners manual   English Deutsch Francais - kingmace

service manual   English - fmmech

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Reviewed May 30th, 2014 by barfod

Plays bigger than 40w/ch would suggest. Of my speakers, it pairs best with my Monitor Audio Bronze BX2 bookshelf speakers. This combo seriously rocks my little listening room! My Polk Audio R40 would be second choice to pair. When paired with either of those speakers the amp is clean and punchy with AC/DC- Back In Black. So the amp rocks, but it also does a wonderful job with acoustic recordings like Michael Hedges- Watching My Life Go By, or more electronic synth-stuff like Mannhiem Steamroller- Fresh Aire V, or Donald Fagen- Nightfly. Even Herbie Hancock- Headhunter and Ramsey Lewis'- The In Crowd sound great on vinyl! Of the vintage audio I have, this is fast becoming my favorite. I genuinely enjoy my Yamaha R700 and CR420, but this one sounds just a little better, a little cleaner than the others. Unfortunately, it isn't powerful enough to show off my prized Thiel CS3.5. Not enough power to do those speakers justice, but then again, I didn't buy this amp to power my Thiels.

In conclusion, used in a small-ish 11' x 11' room with some good bookshelf speakers this amp is ideal. Plenty of power, while showing off what Yamaha's Natural Sound moniker means. It's the good stuff.



re: A-550

I rebuilt this amplifier recap and i Find a great sound like most high end... From Tokay.

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