What original tubes are Mesa relabeled tubes?

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tubelix

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Mesa tubes are relabeled tubes but what original tubes are they?

Found som info on preamp tubes here: http://forum.grailtone.com/viewtopic.php?t=370&highlight=relabled&sid=77a03fd54a7d2d2b60b3685d85c4881a

What about Mesa relabeled power tubes?
 
The original MESA SPAX7-A tubes that came with my .50 caliber combo (made -88 ) doesn’t look like Sovtek or Electro-Harmonix tubes. It has 5 x SPAX7-A and 4 × EL84 tubes.

I found a Chinese 12AX7A tube to be a match to these original MESA SPAX7-A tubes. Mesa has apparently at times used Chinese 12AX7 preamp tubes.

My original MESA SPAX7-A tubes looks almost identical to this 12AT7 tube.
http://www.kandashokai.co.jp/boogie/tube/12at7.jpg

Does anybody know more about MESA SPAX7-A tubes looking like this?

Edit:
This is a picture of one of the original MESA SPAX7-A tubes.
http://img340.imageshack.us/my.php?image=mesaspax7a1xb.jpg
 
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