Mike,
I just added the two resistors for the 6db extra gain to my ARC LS15 (tube pre). It's probably the same mod with the same results. Sound quality is unchanged - no sonic difference that I could detect. The extra gain in real terms is marginal, based on the volume pot settings it doesn't seem to provide much more than 15-20% increased output. It still isn't enough for my application.
Rooze
I just added the two resistors for the 6db extra gain to my ARC LS15 (tube pre). It's probably the same mod with the same results. Sound quality is unchanged - no sonic difference that I could detect. The extra gain in real terms is marginal, based on the volume pot settings it doesn't seem to provide much more than 15-20% increased output. It still isn't enough for my application.
Rooze