I checked Audio Classics. They have the IV for $3995.00 and the V for $4495.00. You could call them and ask about the difference in sound, the steered me out of a component that didn’t sound as good as one for less money.
JJ has been the current supplier of tubes for McIntosh for many years now. I bought some new McIntosh branded 12ax7 tubes from Audio Classics and was told they are all made by JJ.
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