No replies so far, maybe no owners here. I just discussed this amp last week with a friend looking to buy a 300b. My concern is that Dennis is using less expensive components to make an amp that sells for $4k with $1.5K ouput tubes. You can see the less expensive components in the photos of the insides available on the internet.
I also like a larger driver tube in a 300b so I sent him to a boutique amp maker I know who uses a 6V6 driver.
Dennis has a great reputation and probably knows where best to invest in a design so I hope it sounds great for you. Please report back on how it sounds.
I always put my pre in front of my integrated and turn the integrated up all the way. What I really need in an amp with multiple inputs. Don't know why that isn't normally made.
Jerry