Mitchum or Blackburn for the Mullard 6922?

Just bought a Blackburn e88cc on Ebay. I'll provide feedback by and by, though without a Mitchum to compare.

Codes when I have it in hand.

I'll look for the other numbers in a while. The tube's fermenting in my dac at the moment and sounds rich, detailed, 3-dimensional and quiet. 

petg60... Mullard e88cc code is B5H3.

Tube code is etched on the bottom side. 

Yes, it's IEC Mullard, although the IEC is patchy. 

Ha ha ha. Now I'm worndering what Mitchum production sounds like.

The Blackburn Mullard is fully burned in. The weakness of the tube is the anemic bass and midbass, producing an unbalanced sound spectrum. The upper mids and highs are glorious, however, detailed, harmonically layered, 3-dimensional and natural sounding -- among the best I have heard. This tube is great for a narrow range of music (in my system), but not for general use. For instance, a soundtrack of nature sounds from the forests and savannas of Africa is the most layered and natural sounding that have heard thus far. I use this recording as a test for soundstage and imaging. Another downside of the Mullard is a more restricted dynamic range compared to a Siemens 6922. I wonder if the Mitcham production fills in the bottom frequency range, offering as detailed but more balanced sound.

tvad... Have you compared the Blackburn and Mitcham e88ccs?

Tvad... On the contrary, I'm "satisfied" with most of the 6922s I've tried. Each has its own character and I appreciate their respective ways with music. On occasion I change tubes when listening to particular types of music. My generalist tubes thus far are the Amperex USA 6922 D-getter and the early Siemens e88cc. There are still mnay I haven't tried. What fun. Re the Mullard, maybe I got an inferior tube...

Ah, yes the "magical midrange." I agree. Yet in my Blackburn, the mids and upper mids seem over-emphasized. I prefer to tone it down a notch or up the bass and midbass. Could be a mismatch with my system, I suppose. Does the Mitcham have as much detail and air? 

RAM?

Wow, it took a long time --150 hrs or so -- for my Mullard e88cc to break in. Now the bass is fleshed out, the highs smoother and soundstage more dimensional. Altogether a more balanced sound. Yes, magical, richly satturated midrange, if without the razor sharp delineation of the Siemens -- a wetter, more romantic sound. It's certainly a keeper, at least for certain kinds of music..