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I have a Mk4 Boogie which I have had from new (1996) and which I love to pieces and use for at least 50+ gigs a year. On my last couple of gigs it has been very slow to come up to volume. i usually leave it on standby for about 30mins before the 1st set. It starts quiet and thin (very worrying) but gradually come up to normal volume after about 10minutes. The tubes are a couple of years old but don't seem to be malfunctioning. Any ideas?