Curious to hear if anyone has tried tube rolling the Atma-Sphere MA-1 or MA-2, for that matter: driver tube vs power tube rolling? Anyone tried replacing the 6AS7G power tubes with either 5998 tubes or 6080 tubes? Thanks.
I've had my MP-1 and M60s for 20 years now. Follow Ralph's advice and stick with the Russian provenance 6AS7Gs or, alternatively, the 6H13C. I had a brief fling with the Chinese variant and found they had a high failure rate/short life span.
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