I have use both GZ37's and GZ34's in my amp. With the GZ34's the B+ is 425v and the amp has a very taught, muscular robust sound. With the GZ37's the B+ is 400v and the sound is more relaxed with more breath and ease but also slightly softer around the edges.
Not sure what causes the difference in sound. Is it the difference in B+ or is it the different tube? I am guessing its the difference in B+.
Not sure what causes the difference in sound. Is it the difference in B+ or is it the different tube? I am guessing its the difference in B+.