I'm patiently progressing thorough an M125 assembly and will need to order tubes soon. I've read many favorable reviews of Gold Lion 88's and Tung Sol 120's. From what I have gathered the 120's might be a little more durable and have a bit more "umph" while the GL's might be "sweeter" at mid and higher frequencies.
Anybody care to comment or suggest other options? Obviously this is a matter of preference and perception, but any input is appreciated.