SANSUI AU-719 Gets Really Hot?

Stanwal, Please explain. I don't understand how the numbers you posted make you think the OPs amp is not working properly.

I think the easiest test would be disconnecting the second set of speakers and only running the Sansui SP-7500X, the speakers the AU-719 was designed for. This would be much easier than having the amp checked by a tech. The OP also mentioned in his post playing music at half volume which I assume is the 12 o'clock setting on the volume control. This setting could easily be approaching the amplifier's limit.

Although the model numbers are similar the amplifiers can be quite different on the inside and I believe the AU-719 was designed different than previous models.

I would suspect filter caps that have dried up some and are becoming resistive producing heat as well as output transistors that maybe seeing a higher bias than they should be and heating as well.

Thanks again, I'm going to try to get someone to look at it as I discovered another problem last night. The Tone Defeat switch works just fine in the "Defeat" position" but in the "On" position the right side cut out on me (although it had been working just fine in the "On" position up til then). I cleaned it prior to hooking the amp up last week. I tried it again this morning and once again the right side cut out so I moved the switch up and down quite a few times and sometimes all four speakers would work, sometimes just one side would work and a couple of times neither side would work (while in the "On" position / all four speakers seem to always work in the "Defeat" position though). I don't think that has anything to do with the excessive heat but as I'm finding out, this unit has some issues. Later today I'm going to try it with just two speakers and see if that makes a difference with the overheating issue, then I guess I'll just have to hook up one of the other ones for a while and see about getting this one fixed, Thanks again for all the help, I really appreciate it because if you haven't already noticed, I'm not exactly technically inclined when it comes to these things:)

Just listened to it for about 40 minutes with only the two main speakers hooked up and it still gets extremely hot. I had the volume at less than half (or at about 11 O'clock). Time to hook up a different one and once again, thank you for the help.

I don't know if this is worth mentioning but I unhooked the 719 and hooked up my little 417 and it is driving all four speakers without breaking a sweat, it is barely warm.