For years I was using a Crown DC300A Series II with my Alembic F-2B preamp. Recently I picked up a used Fender Rumble 150 head on Craigslist (for $60!) and became intrigued with a light Class D solution (my back and I aren't getting any younger). Although I find the Rumble a great amp for its size, weight, and cost, I'm missing the Alembic F-2B sound. Therefore, I'm thinking of pulling out the F-2B again but this time mating it with a small Class D amp module, something like a B&O IcePower module or a PowerSoft DigiMod module. I could probably fit it all in a 3U rack, or maybe even a 2U if I placed the Class D module behind the F-2B. Anyone do anything similiar? Any sources for IcePower or DigiMod modules other than eBay?