Even though I'm still just catching up on my heptodes (I'm amazed how fast some of you get your tubes in the mail, everything I order takes over a week to get to me... I ordered the same IBM 1680 as gibosi a whole week before him and still don't have them lol...), I finally got a few of the "6BE6 essentials".
So, I have a pair of Haltron Should-be-Siemens 6BE6 from the NOSTubeStore, actually labeled CV453 everywhere, and also two genuine Telefunken EK90 in Tele boxes. The "Haltmens" actually do look like most of your -assumingly genuine- Siemens EK90 with O-getters and an alphanumeric code on the base, or at least like one version of these I saw here. They look perfectly identical to the genuine Siemens EH90 I've seen here, on the other hand (the holes in the plate are close to the fold in the plate, whereas a few of your O-getter EK90 have the holes further away from the fold; my tubes have two-digit numbers inscribed in the glass at the base, and small ribs in the plate too, though the ribs don't seem as emphasized as in your pictures).
Anyway, regardless of what they are (I'm still not sure what we've been calling genuine Siemens were actually made by Siemens, but who cares as long as they sound good), they sound... great, awesome, and even better than my best 6BY6 and premium variants. A natural, detailed, realistic and, above all, thoroughly engaging sound with close to perfect focus and "ambiance", as A11 puts it; these also have a more "normal" soundstage than my favorite Tele/vanias 5915/EH900S -at least compared to those 1-7 strapped- but still plenty large and expansive, just more natural; they are also less forward and have more presence than my second fav' E91H -whether or not strapped. I'm burning these in unstrapped for the time being, as everyone seemed to agree that yielded the best results -and I have to agree up to here!
Last detail, I find these tubes -unstrapped- to not sound as "wet" or "tubey" as my other unstrapped heptodes, these are noticeably drier, in a good way; not that I mind a bit of tubeyness or tube echo-like wetness as it adds -often fake- ambiance, but as I mentioned recently, I do find myself straying away from a warm, cozy, or just easy sound signature, and having drier, and perhaps more challenging tubes actually works very well as far as I'm concerned -and on my gear obviously ;) .
Mab1376, I believe you had also bought some "Haltmens" from the same source I did. Any chance you could throw in a picture of both tubes and their boxes for reference? I'll do the same as soon as I can pull them out of the amp! I'm curious as to what they exactly look like, since we've been seeing quite a lot of variety in Siemens -labeled- tubes.