"New Stock" EH EL34 Fat Boy and TungSol 6550

Thanks, Zinfan, that's helpful. Reading your descriptions of the Svets and EH's, I think we hear the same relative differences between the two but just have different subjective preferences (besides having different equipment; my tubes are in a Van Alstine Super 70i amp). For example, to me the Svets's midrange is a little too bloomy; the EH's are lean but sound more open and have more delicate, crystalline highs. But there certainly are things I like about the Svets. If the Fat Boys have both good bass and lots of air, they sound like something I'd like to try sometime.

I'm wondering, what recordings do tube fans like ourselves typically use to test out new tubes, or when trying to determine whether their tubes are delivering the sonic goods over time? I have a short list of CDs for this purpose including Miles Davis and the Modern Jazz Giants to hear how well the opening vibes in the first cut "glow" and also whether the tape hiss of the old recording becomes instrusive (with some 12ax7s, it does). I also use Chris Isaak's Baja Sessions, which is beautifully recorded; Christa Ludwig singing Mahler orchestral songs, which some tubes make muddy sounding and other make ethereal; and The Great Jazz Trio to hear how drums and bass are handled. Dylan's Oh Mercy has some great moments that try tubes souls as well--like the beginning of The Man In The Long Black Coat.

I agree with the comments Zinfan2 has made. I wasn't happy with any modern day EL34 I tried until I found the EH fat bottle. I've nothing negative to say about it I think there great and the price is right. I found them more revealing, resolute and musical than my Sylvania Fat Bottles that test at 98%. Why I don't know but the differnce was apparant. However the body, bass and slam of the music is bigger in the Sylvania then the EH.

Then a friend of mine who builds his own amps/preamps turned me on to the Ei fat bottles and holy cow I cannot believe ears!! Easily the best modern day EL34/6CA7 I have heard period. Another friend of mine has cryoed Mullard xf2 and we could not distinguish any differences between them and the Ei. I love the Mullards there awesome but seeing we couldn't hear a difference why not buy the cheap Ei? As you can see I have no bias or loyalty to any tubes past or present I go with my what my ears tell me and the EI 6CA7 is the cats ass in my rig!!

Just something to think about when your searching for the right output tube don't write off the Ei. The output tubes are so important it is amazing how they change the sound of your amp. A lame output tube makes for a lame hifi in my experience.