When to change your amplifiers tubes?


I've had the same tubes in my amplifier (Audio Research VT100 MkII) for at least three (maybe four) years now (I'm guessing that I average about 7 - 10 hours a week listening time). The amp sounds good to me, but I'm wondering if it's just because I've become use to the sound. It's going to cost me anywhere from $750 to $1,000 to retube my amp, so I don't want to retube it unless it is time to. So here are my questions:
What audible signs do you hear that indicate it is time to retube?
Should I consider retubing just the power tubes, and wait to retube the input tubes?
Any thoughts you'd like to share with me will be greatly appreciated!
louisl

Showing 1 response by lwerner

Is the $700-$1,000 for 1 amp or a pair? Either way it`s way too much.
Try Parts Connextion in Toronto, I used them for the past 10yrs or more, $450, for all tubes for a pair of Audio Reaserch Classic 120`s, 6550c`s Sovtek`s, matched pairs or Quads and drivers,

Never a problem or a dud.