Hitachi HMA 7500

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From: Bonnington Clarke
Date: Tue, 27 Jan 1998 00:00

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I recently picked up a second hand Hitachi HMA 7500 power amplifier of
around 1980 vintage. I recall that this was one of the first available
power MOSFET designs. It was originally rated as 75w/channel with total
harmonic distortion < 0.01 % 20-20000Hz. It seems more powerful than its
rating. Can somebody give me a reference for a test report of this unit?
It has dual power transformers but I would like to find out if it is truly
dual mono. It does not sound as good as my Hafler DH200 of slighly later
vintage - not as smooth and less "grunt". Maybe it has something to do
with having one pair of output MOSFET's per channel, while the Hafler has
parallel pairs.

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From: bon@mpce.mq.edu.au (Bonnington Clarke)
Subject: Hitachi HMA 7500
Date: 1998/01/27
Message-ID: <bon-2701981626250001@mac254.mpce.mq.edu.au>
X-Deja-AN: 319583320
Organization: Macquarie University
Newsgroups: rec.audio.misc,,rec.audio.opinion,,rec.audio.tech,aus.hi-fi