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Sansui au-x501 vs AU-D5/D7

DB-7 said:
The AU-X501 is the hands down winner.
It has better sound, better build and better appearance.
The wpc is the same as the D7 at 80wpc.
The X501 will be far more detailed and precise than either of the D series.

I have no idea how it would compare to a Pioneer or Marantz

I have two D7's here. One will be used as parts. The other is ok, but will likely never be used and may end up parts too.
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I have noticed that the AU-D7 and D5 seem to get very warm, anyone know of more details? Is it because of the "Linear A" circuitry, or does it have inadequate heat dissipation capability? I noticed Sansui made a change to the impedance rating, which they also did on some of the smaller Z series receivers that were made at the same time. The early units were ~ 8 to 16 ohms, as shown on the back, where the speaker terminals are, whereas later units were 4 ohms, not 8. However, I dont think there was a service bulletin for this, nor any circuitry change. I am curious because the amp does seem to run on the hot side, so it seems like 4 ohms speakers would not be compatible with it.
 
On the AU-D5 I checked for a friend bias was misadjusted, too high in one channel therefore runs hotter than normal. Bias should be checked, maybe it drifts for some reason on that series.
 
Thanks, yes checking the bias is a good idea, though have to be careful, thats done with the amplifier on, so if its hard to put a probe on the test point due to limited access space inside, and it accidentally comes off, it can short something out. Also, those trimmer pots seems very flaky, just the slightest turn and it can send the meter reading all over the place.
 
The two buttons for 200/400HZ affect the frequency below which the boost/cut occurs. The treble affects all the frequencies above the selected frequency.
 
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