I changed TR101 and TR102 to the KSA992's as recommended. Here's the results and details:
Offset in left channel went from 23mV to 13mV
Offset in right channel went from 43mV to 16mV
Left channel, old transistors:
TR101: 345 hFE
TR102: 331 hFE
Left channel, new transistors:
TR101: 398 hFE
TR102: 396 hFE
Right channel, old transistors:
TR101: 281 hFE
TR102: 348 hFE
Right channel, new transistors:
TR101: 410 hFE
TR102: 410 hFE
Thanks again, avionic, for this excellent advice!
The repair of this amp (maybe I could also call it a refurbishment) was a awesome success and it turned out to be a fun project :yes:
After completion, I connected the amp to my ADS L880's, and I have probably close to 8 hours of listening. The sound is fantastic! Tall, wide, and deep soundstage. Very clear and detailed. There's a sense of space between instruments. It powers the L880's with authority :guitar:
If there are any other improvements or mods that could be done, I would be interested in hearing about them. :yes: