There was an MPulse 360, which is basically the Walkabout with some modest design differences. But, while the Walkabout is 300w (@4ohms) there never was a product called the Walkabout 300 per se. So, you are just kind of mixing your Mesa product names up a bit.
For your other questions, as the poster above suggested, try the Walkabout Megathread.
great amp, wonderful tone options.
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Last edited by pfschim : 02-07-2013 at 10:13 PM.