@czarivey , My ''headache'' was matching impedance and
inductance between my + 40 MC carts and SUT's. However
my Denon AU-S1 covers 2-40 Ohms so I don't need to buy,
say, 10 SUT's. However my post about moving parts and their
mass is more easy to grasp then your ''silicon-versus -tubes''
enigma.