hi everyone, my BM4000 has developed a channel drop out issue. its starts quite normal but after 5 to 15? min the left channel just disappears. i checked the corresponding output transistors but they are fine, checked the emitter resistors which drifted by about 25%, so I fitted a replacement set - the strange thingis that the original emitter resistors were specified as 0.33 ohm resistors, contrary to the service manual which says 0.15 ohm ?? anyhow, can someone point me in the right direction here - that would really help. I wonder if there is a hidden switch issue as the cause, it looks like a heat problem to me amongst various other options ?? thank you for helping out ALF