In Reply to: Worn valves posted by freebyname@optusnet.com.au on January 6, 2009 at 18:39:49:
when you start thinking they might be worn out.
The hypothesis is that when you find the music doesn't please you as much as it did, then the valves are the first suspects. They aren't always the problem, but that probability is high provided you haven't made other changes recently.
Once you change you valves you'll have the proof, or it'll lead you to look in another direction. The cost for this step is a set of replacement valves, which will never go to waste.
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Follow Ups
- Probably . . - Frank E 01/7/0911:11:45 01/7/09 (0)