Most tube rolling would be with the 12at7's. You've got to be hard core to start rolling rectifiers. Time to start reading: "A Taste of Tubes" on sonic frontiers/Anthem web site & search for "Joe's Tube Lore". You will learn a lot. Email me if you can't find these.
relationship between rec. and the other tubes?
New to tubes, in my pre I have (1) 5z4p rec tube and (2) 12at7 tubes. What is the relationship between them? When I change diff. Brand 12at7's it affects the low and high and mids. Not sure what the rec. Tube does? Tyring to get a handle on this. Any help is appreated! Thanks.