All of Stax boxs do not give it any issues and sound really good, so I don''t think it's marginally stable.
I am also not sure if chip has a build in protection. If Sony box is like AT it would be said as I like MP5 as my PC amp
It is mostly likely a load issue but I though that Stax box as well as AT box is a standard 8 Ohm load. What do you think AT box does that Stax box does not? My MOSFET amp has no problem with any of the boxes and even drives my "watch me dip to 1 Ohm" ribbon speakers so I was not surpriced to see it handle AT box with ease. It seems that AT box needs at least 10W to sound good, MP5 is like 14W and my MOSFET amp is 25W in class A. Maybe it's dips low and thus makes the STI TDA7265 power chip shutdown temporarily? The data-sheet talk about some kind of mute attenuation, what is that feature?
I will try different cable tonight. I was using rather thick speaker cables....but I bet it will not change much.
What small amps would work well with Stax, AT and ECR boxes? Will this amp push them? It seems that it can be used as stand alone amp with 25WPC.
My Rotel RA-820BX hasn't shied away from anything I've hooked up to it, and it's equally lowly. The ECR-500 does sound livelier on my (still dead, again) akai power amp, though.