I think it is also suffering from a PCB issue as I had some funny buzzes turn up when the top panel was pushed in certain places. I took it to bits (I'm an electrical engineer) and checked it was assembled OK and did a general tightening on the unit. Put it back together and it's been fine since, but I do wonder about the rigidity of the amp, especially as I don't rev mine up as much as some.
That all said, I think it's a monster little amp with great tone, and I just love to look at the thing. It's so retro, I had a Bluesbreaker many years ago and it's just like that, but smaller, so cute ha ha - yes I'm old like many of the Customers for a Class 5. Try connecting it to a 4x12 (1960AV) - wow - now it does have tone. I think the Class 5 with an almost closed back and small port at the bottom is too boxy sounding, so I stuffed some foam in the port, not fully blocking it, I like the difference that made. The almost closed back could be a cause of the rattles for some as I'm not convinced inside mechanically it's up to all the vibrations running full tilt. I'm sure Marshall tested it, but did they test the production models enough?
After all that tho, my conclusions are - Fantastic amp, great sounds, great looks, lets hope all those with issues get theirs sorted out, coz once you have a goodun, you will just love it. I love mine, and the more I use it, the better it gets, there is a burnin period for these amps, more than any other amp I have ever known, it's worth sticking with it to get past this point - you won't regret it long term.
