A couple days ago I noticed my RKII starting too sound thin and very sizzly. Channel two became completely un-playable, it was very harsh tone and the only way i can describe the character of it is "schhhhhhhh" So I replaced the V2 pre-amp tube. and paced thru the channels, everything sounded like it should, I went back to channel 2, flipped it to "brit" mode and bam back to the old way again on channels 2,3,4. I know the V2 is responsible for the first gain stage in all those channels. About a month ago I blew the V3 tube, and I understand that its a "cathode follower" tube (whatever that means) To all you tech out there; does this sound like a common problem? Any help will be appreciated. Thank you.