hi,
I've used KT88's ( EH and JJ Telsa) and 6550's ( Tung Sol nos solid gray plates, and Phillips nos ) biased at 75 with good sound. The favorites of mine are the JJ's and Tung Sols.
I tried EL-34's and , well they are in a box and the Kt-88s are in the amp.
good listening,
Larry
I've used KT88's ( EH and JJ Telsa) and 6550's ( Tung Sol nos solid gray plates, and Phillips nos ) biased at 75 with good sound. The favorites of mine are the JJ's and Tung Sols.
I tried EL-34's and , well they are in a box and the Kt-88s are in the amp.
good listening,
Larry