Yes they have to be matched. The plates should be matched between the tubes in the method specified by RAM, AB for V1 and BA for B2, meaning the outer plates of each tube and the inner plates of each tube.
Best to get the tubes from Roger. I use the stock tubes as supplied by RAM and they are very quiet. The sound is also more than acceptable. I believe Roger can supply some nice Sylvania NOS 12AX7 tubes in addition to the stock Yugo tubes.
Best to get the tubes from Roger. I use the stock tubes as supplied by RAM and they are very quiet. The sound is also more than acceptable. I believe Roger can supply some nice Sylvania NOS 12AX7 tubes in addition to the stock Yugo tubes.