Yes! When I finished adding the VTA mods to my second Dyna 70 amp, I set everything up in a vertical bi-amp configuration using two stereo amps....one channel of each amp for woofer, one for mids/tweeter. Soundstage was spectacular!
At one point of the channels developed a problem, so I just want back to using them as single channel mono blocks as opposed to pulling the amp out of service to fix it. (one of these days I will, but in the meantime at least I'm not burning 8 Gold Lion KT66s at once!). In the mean time, I introduced a solid state integrated amp to run the woofers (below 80hz), and use the Dyna/VTA tube ups up top on the midbass/tweeters. Technically the addition of the SS amp is horizontal bi-amping, but monoblocks are inherently vertical, so I suppose it's really a hybrid bi-amp configuration. It still sounds wonderful to me, and bass dynamics are better on the woofers from the SS integrated amp.
-Scott