[quote name='Sharkfinger' timestamp='1396555810' post='2415145']
Sounds like it's going full pelt to keep up. Not ideal. Seeing as the Fender Rumble V3 is based on the contour (correct me if I'm wrong), it may be prone to the same thing. That leaves the ashdown.
Perhaps I should be looking at one without a switched mode power supply, maybe that's the problem.
[/quote]
I didn't mean to sound negative about it, in fact I love the tone and portability of it and it serves me well and I'm keeping it. Just try one if you can.