Apparently Victor has a nice stash of the NOS DR tubes and provides them as stock with the flagship 51SE. Obviously the DR tubes will not make the 31SE sound as good as the 51SE. The 51SE is IMHO substantially better than the 31SE but it is up to the buyer whether that difference is worth the extra cost. Get some of the lower priced DR NOS tubes(you only need 4) and see if they improve your 31SE 'enough'. If not, they will not be wasted and you may end up considering the 51SE.
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