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What are the differences? I spoke with Leonard at ARC today who said the only change was to the power supply; different resistor values he believes were the only change. No sonic difference. What's your experience?
Follow Ups:
God, Leonard is still around? The guy must be 70!
Man, what a nice guy!
I own an SP6B. It uses all 12AX7s in the line and phono stages. Mine was modded by the first owner and takes a 12AU7 in the phase splitter position in each tube array which I roll with 5751s and the 12AU7s and some 12AX7s . The bigger difference is undoubtedly not between the A - C but between those and the 6922 versions D-E. Knowing both the preamp and the tubes I would bet you will find the 6922 versions have a lower noise floor and somewhat less rambunctious gain than the 12AX7 versions.
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