OK, I'm back. Loving the WA more than ever, but I see I'm not the only one who's wishing for a bit more volume at times. Before I stray into the all-tube jungle out there, is there a way to add a slave amp? I'm in tone heaven, it's strictly a power thing. Didn't I see someone running a stack of WA'S?
I can go M-Pulse 600, I don't need the extra EQ or compressor. I'm really fond of the little guy.
I have used a Walkabout 12 combo for mor than 2 years now and went down a similar "need more power" path myself about a year ago. My experience showed me that:
you
can use a power amp to get more juice,
BUT, (IMO/IME) the WA tone seems to be very tied up in the coupling of the pre and power sections within the WA head. So, my ears told me that the WA pre into a bigger power section was not a louder WA. It sounded ok, just not the same tonal goodness of the WA. I used a Strategy 500 as well as the slave in of an MPulse600 for my experiments.
The MPulse600 is
NOT a louder, 600w Walkabout. Whole different tonal animal. Sounds good, and can do a close approximation of the WA (and vice-verse I suppose), but don't grab a 600 thinking that it'll be just a louder WA.
For reference, I did end up buying a Venture 2x12 combo. (Mpluse600 driving a PH 2x12 cab).
You can run the 4ohm WA into a 4ohm ext cab (I personally use a Scout 15) and you will be squeezing ~500w out of the WA head. Decent additional amount of power, and the addl cab really builds the overall sound level, but by no means does it double or anything.
Ultimately, you can use 2 (or more) Walkabouts and really scale up the volume. I had the oppty to do this on just one gig using the dual outputs of a Radial box. It was very cool, particularly when I got a few moments to adjust the tone from each one slightly differently using the crossover controls and a little bit of EQ tweaking. Very nice! .. but it did not compel me to go out and buy another WA for that purpose.
I think there is a photo out on the web of Ben Kenney of Incubus with a 4 or six way stack of Walkabouts in some wine red tolex with tan grills. Cool photo.
good luck