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CEI Branded (and Mismarked) 12AU7s

Posted by baileyler on March 17, 2021 at 17:33:56:

I recently picked up a group with some CEI branded tubes marked as 7316/ECC186. All say made in Holland.

Some are true 7316s (with appropriate etched codes), but the 6 in the photo clearly are not.

I think I have the first three identified, but I am unsure about the last three.

In the photos, tube #1 has no etched codes, a cross-hatched top glass and a tilted halo getter element. I believe it is a Japanese made 12AU7.

Tube #2 has long black plates and I believe it is an old USA made 12AU7 (RCA or possibly Tung Sol).

Tube #3 has short black plates and looks most like a USA made GE or Sylvania 5814.

Tubes #4, #5 and #6 are a bit mystery to me. Please help me identify.

They all have short grey ladder plates, but the ladder part is not very raised. They all also have medium-sized halo getters that are a little on the thick side. There are no etched markings that I can find. They each have a raised number in the bottom glass - 5, 6 (or 9) and 24.

If I had to guess, they are EI (Yugo) made.

Any opinions?