I have not compared directly to the Gold Lion, but the 12AU7 is one of Mullards finest. It is one of the most rugged tubes and is very good sounding. (very long lasting) For the 12AX7, I think you would be OK with one of the new production premium tubes, they seem to get good reviews. I have seen pairs of Telefunkens pop up here on A-gon from a Canadian seller for very fair prices though and might be about the same price..