Cheers, thanks for the info.
I don't think anything's wrong with it, but because I've only had it for a couple of months, I don't know if it sounded 'better' a year or two ago if you know what I mean. Would you recommend getting it to a tech to make sure everything's hunky dory? It's from the 70's (no indication of date inside casing etc) and is made by an italian firm called Gem. The model is a Saturn Bass 50 and I simply cannot find any information on it anywhere! I don't know how well it's been maintained and I can't even see what valves it has, there's no markings or anything.
Truckstop