Hi 38th,
Thanks for your coments here.
I have just noticed that I actually asked the wrong guy the question - I meant to ask your good self rather than Muzz - my mistake (new to the forum), thanks for picking up on this.
There is a noticable hum and certainly a bit of hiss at higher volumes although I don't think it is a real problem. If it degrades any further I will look at returing or replacing valves as you have suggested. Laney do a free 5 year extended warranty which seems pretty reasonable of them, however, I am reluctant to package and ship on a marginal warranty as this is just as likley to cause some other issues.
Like you, though, I think that this is a very good amp for the price. Need to play it in a bit more but I have been very impressed with the tone - nice sparkle and warmth - and would highly recommend. We should be earing comission from Laney.
Cheers
Joe