I will be attending to a Creek 5350SE integrated amplifier, schematic attached, which has been repaired previously by someone else. Two HUF76639P3 devices on the right channel (Q115 and Q118 - add 100 to get part numbers for right channel) have been replaced with imperfect substitutes and the voltage across R125 (which should be 600mV) was cranked up to nearly 1.2V to compensate. (It appears Q115 and Q118 aren't logic level devices, but they should be.) All other components appear original.
The power amp section schematic I've attached is found readily online. Mike Creek was great, promptly emailing me the entire amp schematics and layout documents and confirming IRL2910 are suitable replacements for the HUF76639P3, which are now obsolete and almost unobtainable. He also advised I change all four output devices on the right channel, not just the suspect ones. So far so good.
However, I have another question, which I could ask Mike Creek, but don't want to needlessly trouble him again: I have come across the importance of matching devices, eg: http://passdiy.com/pdf/matching.pdf and thought I would indeed need to (so they evenly share the load), but was just wondering if this is correct. Many thanks for any helpful info!
The power amp section schematic I've attached is found readily online. Mike Creek was great, promptly emailing me the entire amp schematics and layout documents and confirming IRL2910 are suitable replacements for the HUF76639P3, which are now obsolete and almost unobtainable. He also advised I change all four output devices on the right channel, not just the suspect ones. So far so good.
However, I have another question, which I could ask Mike Creek, but don't want to needlessly trouble him again: I have come across the importance of matching devices, eg: http://passdiy.com/pdf/matching.pdf and thought I would indeed need to (so they evenly share the load), but was just wondering if this is correct. Many thanks for any helpful info!