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To build on what you said.....

Posted by AbeCollins on November 27, 2024 at 07:19:07:
I don't think the ML 383 had a passive preamp section but I can't be sure. On the other hand my Pass Labs INT-150 did. According to Pass it was basically their X150.5 amp with a passive preamp section. It wasn't dead sounding but it lacked the more energetic nature of my X2.5 pre and X150.5 power amp separates that it replaced.
The newer Pass integrated amps use an an active preamp section with gain. They must have learned from their first integrated amp product which was the INT-150 that I owned.