It’s super for the MC guys and the Tubes Bob notes. I use it as my main tester for the 6550’s in my Ref 40 and 12AX7’s in my tube amp. Does a super job of matching tubes based on multiple parameters not just one or two and assign s a numerical value to the tube for matching. The JAN GE 6550’s in my Ref 40 we’re matched to exact numerical value and sound superb.
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