My board uses the 6922/6DJ8 tubes and I'm using NOS Siemens tubes. I didn't know there was an option for boards.
Don helped me out with some noise issues I was having in 1 channel along with giving me some tweeks to do..such as replacing some of the electrolytic caps in the P/S with film caps. I also replaced quite a few resistors with Texas Instruments TX2575, Takman metal film, and Audio Note Niobium in the audio circuit.