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Akai AM-A70

Stereo Integrated Amplifier (1986-87)

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Akai AM-A70

Specifications

Power output: 100 watts per channel into 8Ω (stereo)

Frequency response: 5Hz to 100kHz

Total harmonic distortion: 0.5%

Damping factor: 30

Input sensitivity: 0.2mV (MC), 2mV (MM), 150mV (line)

Signal to noise ratio: 67dB (MC), 86dB (MM), 100dB (line)

Output: 150mV (line)

Speaker load impedance: 4Ω to 16Ω

Dimensions: 440 x 120 x 410mm

Weight: 11.5kg

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Reviewed Apr 25th, 2017 by mbs54

I bought one of these recently from a friend who bids on storage units. It was, in a word - filthy! When you looked through the top vents you could a 1/4 inch of dust on the main board.
I used a soft artists brush, dust off, and a shop vac to clean it up before I turned it on to avoid any unwanted connections from the dust (15 minutes). Do this carefully as the main capacitors are rather large. Internally very well-fused. I was impressed with the quality of the circuit board components. Lots of thick copper shielding, a massive transformer and generous heat sinks all around for keeping cool.
Then, I tested the amp. It powered on, and there was noticeable distortion from the right channel. Disappointed, but undaunted I carefully cleaned all pots and switches I could easily access and waited about an hour for the deoxit to evaporate.
Happy surprise! Both channels functioning, and much improved. Sound was cleaner with little noise.
Still, a persistent distortion on the right channel when engaging the direct switch with noticeable intermittent deterioration upon engaging this function.
I removed the front panel and was able to access the switches on the daughter board. Took some patience, and persistence to finally get the switches clean.
Voila! excellent sound for a very small investment and some elbow grease. Great backup for my old reliable Yamaha CR-1040.
This stereo amp has excellent flexibility for routing a different source to the record outputs so you can listen to a separate program from the material you are recording.
Also, it has a moving coil head amp in addition to the standard phono pre-amp.
Another nice feature is that each source when selected has a backlit text label above it so you can easily see the name of the source from across the room.
A nice touch too, are the gold plated phono inputs for better conductivity. A plus for those of us who still spin vinyl.
Not quite the same build quality of late '70s Marantz, Yamaha, Onkyo, or ROTEL. Still, a solid piece I will hold onto for the two dollars I invested!
Thanks for the intrepid user who uploaded the service manual, and kudos to hifiengine for all the great resoruces.
I will be adding pix later.
-MS

 

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