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Ultravalve and Psvane 6CA7

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Ultravalve and Psvane 6CA7
« on: 17 Nov 2012, 05:10 pm »
Anyone have experience with these power tubes in the Ultravalve, which seem to be updated Shuguang Black Treasures?

http://www.audiokarma.org/forums/showthread.php?t=462201

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