how about Tungsram E88CC / 6922 . From the internet it is said to be known for it's nicely balanced and detailed sound stage. These are Hungarian made from the early '70's. Recommended for Audible Illusions Modulus preamps.
hope you folks out there will be able to share some experiences.
Currently, the best tubes for the Modulus 3A are the 6h23neb tubes. I bought matched and graded sets from the tube store. Anything else will be a compromise on either musicality or longevity.
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