C375BEE R195 overheating ?
There is a 10uf electrolytic (301/401) in the signalpath, and a few ceramic caps that could be replaced to Wima FKP for example. I would recommed to replace all caps. My 2200uf/ 50V was leaking.
Like sgrossklass said they're totally let doen by bad parts and mostly here its the caps.. JH (jinghai?) and the are BAD.
Also replace the 4x2.2K (3W) res to 5w, they run insanely hot! Also down by the 18v reg there is 2x200R that could be 3w instead of 1W.
Have you checked all voltages? 18, 64 and 68 if i remember right
Anyway this amp was manufactured from 2003 to 2008. The C275 came after that.
Thanks for your analysis.
I have an issue with my C375BEE on the left poweramp board, it came up when I noticed a slight background noise by just turning the amp ON and waiting.
I investigated and made tests ... as soon as I blow on R195/100Ω, 1/6W, 5%, with a thin long plastic tube, the noise stops, but then comes up again, etc.
Visually this resistor doesn't seem affected though.
On the contrary as you mention other resistors can be hot and visually brown, smoked, ... R132/2K2Ω, 1/6W, 5% aspects changed and even reveals its metal, or perhaps the metal fil,m has melt.
I'll replace all these as well as capacitors like C126/100nF, ±5%, 63V by better ones.
Best Regards.