What is your favorite tube type?


With so many tubes that do different things and have different sound profiles, what is your favorite? EL34s wonderful PRaT, KT88/6550s smooth and dimensional sound, lush mids of a 300B, detail of a 2A3 or the huge soundstage of an 845? I am curious which is your favorite. What do you like about it?
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My favorite=a pair of single ended sv83's series straped to mono on woofers and single ended el34 on tweeters. Both putting out about 5 watts.