While considering a micro-sized back-up for my Orange AD200B, it occurred to me this morning that I may be barking up the wrong tree. I have been looking for a micro amp with a valve pre-amp/front end to closely replicate a valve-y type sound (eg Shuttle, Headlite etc). Is there a material risk that the valve could blow/knacker on one of these, thereby ruining its capability as a back-up .... and therefore what I should really be looking for (in terms of as-near-as-100% bullet-proof reliability) is a wholly solid state micro-amp (eg, Markbass F1/LM, TC 450/RH)?