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I have had the same problem since I got it. Purchased on eBay in 2007 from USA and shipped to Ireland. Anyway I doubt I'll ever buy and amp on eBay again! :( Got a great deal but I came across a F50 in one of the guitar shops in London on Denmark St. I asked to check it out, not to play it...

Was just onto the seller in the USA. Helpful. Said the amp was dead quite in the shop. Looks like on its long journey from the USA to Ireland a tube must have got travel sick. Will try the re-tube experimentation ASAP! Will post with update soon!

Not using a huge amount of pre-amp gain - mainly concerned with the clean channel - with gain and master at 5 its quite noticable in my quite attic space. Mostly using the Clean so i'm not really driving the preamp gain hard at all. So Dopeman with your F50 was the clean channel always nice...

To Dopeman! V1 + V2 Tung sol 12 Ax7 - Effect on hiss??? Did you have the same problem with hiss with your f50? Did the Tung sol's help with the hiss problem? To MesaENGR412: Also its not dirty power as i tested my marshall Tsl122 beside it and is fine(not silence but the little amount of noise...

hi all, Many thanks for all the advice. The Boogie Board is really a vibrant place, pleasantly surprised at all the activity. Hey recto-robbie, thanks for the heads-up on dougs tubes... http://www.dougstubes.com/12ax7.htm Gave me reasonable price on shipping here to good auld Dublin...

Thanks for advice. Mesa said that if i wanted to cut the noise on the clean channel then Tube Position V1 could be experimented with. V2 = Crunch channel V3 = FX Loop V4 = Phase / Output stage Q. Should i just change V1 (and perhaps V2)? Or should i change the lot? Q Any point changeint...

hi all, Have just received my shipped F-50 today. Ok the noise it produces is an issue and Mesa were helpful but said that it was just part of the amp and designed to be used for a live setting where the hiss wouldn't be much of an issue. In general I don't like hiss and will play this at...