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Akai AM-U7 Integrated

jedo1507r

jedo1507r

Active Member
I've picked up this Akai AM-U7 integrated last weekend, and of course, it's got a malaise plastic face but has pretty decent sound. That toroid is what lured me in. :D The Akai gives a different sound and defeats the tone controls once I press the "Line Straight" button.

I'm just curious what was behind the "Open Loop Circuit." Was it a gimmick to differentiate Akai from its competitors back in the early 80s?
 
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Could it be an external processor loop for equalizers and other stuff like that?
 
It does not have an external loop. Must be an early/mid '80s feature. :D :confused:

I've done some searching about the feature through a couple of forums, here, here (machine translation, scroll down partway) and here. The "Open Loop" feature introduces a higher THD percentage, without feedback, to add color to the sound. Sounds like Akai was against the current at the time with the U5 and U7 - then dropped the feature thereafter.

Unfortunately there's not much other info on this series.
 
I believe the output stage is open loop, with a very high gain and a very low output impedance (high dumping factor);basically it could drive a nail…:D
 
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