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Mcintosh Mc30 amp tubes

10/21/2000 6:59 PM
Corners
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Mcintosh Mc30 amp tubes
I have two Mc30 amps and recently replaced the output tubes with(6L6 Svetlanas). The remaining tubes are (2) 12ax7, (1)12au7, (1) 5u4, & (1)12bh7. My questions are what do these tubes do? When do I know when they arent working correctly? How often should they be replaced? These tubes have been in the amps for at least 6 years. Most are Telefunken except for one of the 12ax7 tubes which is a Dumont. If I replace them, what brand of tube is best for the application of stereo listening? Thanks, Corners