Transistors? What are they? Don't people use opamps these days?
A client actually remarked to me that I'd used a transistor in one of my designs for him! You had to search for it between all the chips.
Use a cathode follower. It's more musical
If you've got a converter that really does have significant energy output above 3MHz then I suppose you ought to filter it to get rid of vision on sound. The acid test is listening to it on a good telly.
And I counted every single line and I claim a refund. I could only find about 380
