My favorite scheme is to use shunt regulation with a CCS on top of gas regulators. This is simple and extremely effective. I try to pass 2 -3 time the circuit current through the shunt. I've had this make a remarkable difference in the bass quality in particular. A shunt would be harder to do in an output stage, but easy in driver and preamp stages. I do bypass the gas tubes with a teflon cap, something around 0.1uf or so seems to do fine.
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