Mullard 12AX7/ECC83 I61 vs I63?

SQUAREHEAD

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Feb 16, 2015
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If you put each of these in a tube tester and they read EXACT readings in terms of strength and output, what is the tone difference?
I am using them in the front, V1 position in a few different guitar amps… I have never purchased I61 types, all of mine are I63's… which I really love…
I have a chance to buy 2 I61's that test at 122 per triode for each tube on a B and K 747 Dyna jet tester.
Those readings would be extremely high on my B and K 707 Dyna jet tester… that's the problem with buying tubes, everyone uses a different tester and none of them seem to line up. Ughhh
any advice would be greatly appreciated in terms of the tone of these things!
keith
 
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