Hi Scott!
The main reason for a SUT is to give the preamp enough voltage. It sounds like both are already too much, so technically you don't seem to require one.
If you just like the sound, to warm up what you hear, you may want to use a 1:1 isolation transformer. Jensen makes some of the best.
You could also build an L Pad attenuator. after the transformer. Even using the most expensive "naked" Vishay resistors you could do it under $50.
Best,
Erik
The main reason for a SUT is to give the preamp enough voltage. It sounds like both are already too much, so technically you don't seem to require one.
If you just like the sound, to warm up what you hear, you may want to use a 1:1 isolation transformer. Jensen makes some of the best.
You could also build an L Pad attenuator. after the transformer. Even using the most expensive "naked" Vishay resistors you could do it under $50.
Best,
Erik