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I used it for around 100 hours in my Ming Da MC-300 PRE pre amp. I worked all right at first then suddenly one day I saw sparks flying inside the tube, I quickly shut down the pre amp & never used the tube again.
Verified purchase: Yes | Condition: New
For woo audio amplifiers this is the standard it adds openness or fullness it also adds to the appeal . I have one in my wa22 and both my wa6se's .
Verified purchase: Yes | Condition: Pre-owned
Large soundstage, great imaging, smooth, clear sound with fine timbres.
Verified purchase: Yes | Condition: Pre-owned
The Sophia Princess 247B has a huge soundstage and reproduces timbres accurately. I use it in my Woo Audio WA6 headphone amp. and am blown away at the improvement over other tubes. This is not a cheap tube, but it is much cheaper than a Western Electric equivalent. I'm in love with the Princess Sophia.
Verified purchase: No