Stereo Integrated Amplifier (1972-74)
Power output: 30 watts per channel into 8Ω (stereo)
Frequency response: 10Hz to 30kHz
Total harmonic distortion: 0.1%
Damping factor: 40
Input sensitivity: 2.5mV (MM), 100mV (DIN), 100mV (line)
Signal to noise ratio: 70dB (MM), 80dB (line)
Output: 100mV (line), 30mV (DIN), 0.8V (Pre out)
Speaker load impedance: 4Ω to 16Ω
Semiconductors: 35 x transistors, 6 x diodes
Dimensions: 440 x 140 x 322mm
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Reviewed Apr 24th, 2016 by smurfer77
Just testing this amp out now. Initial impressions have surprised me. This amp is a great sounding unit, with terrific bass and clarity. More than enough power for my needs. Doesn't have selectable phono 2 load like some of the other models in this series like the 9500.
What surprised me is how much it sounds like the triple digit series, after reading about harsh sound from various websites from this series. However, most people are talking about the sought-after 9500; maybe it sounds different. (after all the TOTL Au-999 sounds bright and lacking in bass compared to lower models).
The DC was not far off zero and was easy to adjust to practically zero. The bias was running cold at about 15 mV. I kicked it up to 30 mV as per the manual. Again and easy adjustment if you have the tools.
The layout of the internals are really good, spaced out and make it a good amp to restore. Very few boards would even need to be removed to fully rebuild/recap. The build quality of the chassis and boards looks to be still excellent, approaching that of the previous triple digit series. Again, a surprise to me. One difference in this series compared to the older series is that the bass adjustment is centred around 20Hz instead of 50Hz taking away a bit of the bass magic IMO. And the loudness in this series boosts bass and treble points almost equally (where as the older series boosted bass much more than treble point, and this is preferable to my ears).
Extremely happy with my initial impressions - not quite the tonal magic or 'space' of the AU-777A, but excellent nonetheless, including the bass. Will report back if my opinion develop significantly.
Reviewed Jan 28th, 2015 by Paalkj
An old, but good, Integrated Amplifier.
Enough power to create a quite decent volume, and a big power supply witch is able to control big magnets.