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However the vintage European ECC32/33, CV181/CV1988 family of tubes are not real 6SN7 tubes. "

Took that quote from the Sophia website. It's an odd one, because CV32/33 and CV181 are in fact NOT 6SN7s in any way. I have seen CV181s, and they generally resemble those Sophia tubes being sold as 6SN7 replacements. They are electrically different from a 6SN7, and that's why they will sound different from a 6SN7 if plugged into a circuit designed for a 6SN7. On the other hand, CV1988 is a legitimate alternative name for a 6SN7. I have some Mullard/Brimar tubes that are labeled "6SN7GT/CV1988". I have no idea what Sophia is smoking.


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  • However the vintage European ECC32/33, CV181/CV1988 family of tubes are not real 6SN7 tubes. " - Lew 13:05:51 03/28/17 (0)

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