I've had my 5150ii for about six months now. I nabbed it off ebay, and I don't know how old the tubes in it are. I think it's about time I replaced them, because they've been taking a beating since I got it, and they were probably experiencing similar things before I got it.
My plan was to try and change it up by replacing the power tubes with El34s or another British-style power tube. I wanted to know if I'm going to need to mod it to throw those in, and will it cost me an arm and leg if it does?
Another thing I was considering was just buying two of the tubes and running it at 60 watts.
Mod = Yes
Arm and leg = Yes
If you want to change it, sell it on and get a 6534+, much less hassle
If you're gonna revalve, I done my mates recently with a full set of Tung Sol 6L6's I think it was, and 1 Tung Sol in V1, and 4 JJ's for the rest of the pre-amp.