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Old 19th June 2004, 07:50 PM   #1
karma is offline karma  Canada
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Arrow need help finding tube make

the 2 tubes are 12ax7. the one with the big plate sounds great
and can run with a low b+ but there is no information on it. can anyone from just looking at it tell me what make it is?

any tube freaks out there

thanks.........
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Old 19th June 2004, 10:45 PM   #2
SHiFTY is offline SHiFTY  New Zealand
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Well the one on the right is a matsushita, made in japan, not too bad at all. Looks like the one on the left is an old mullard. Does it have a row of small codes on it anywhere?
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Old 19th June 2004, 11:04 PM   #3
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no totally clean of everything but on the plate there is 2 x's
scratched on it
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Old 19th June 2004, 11:15 PM   #4
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mmm the one on the left looks like Mullard due to the smooth plate cut and colour tone.

The closest I've got is a pair of mullard EC90's and they both have "3" scribbled on the plates.
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Old 19th June 2004, 11:17 PM   #5
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I need a picture with better resolution to identify the one on the left...

I need to have a look at the bottom as well...

If the glass on the bottom is crystal clear, then it might be a Japanese tube, or a british one, either Trigon, or Brimmar (of their latest production).

If the left one has a diamond mark <> on the bottom, then you've got a gold..... TFK!

I can see the left one having double mica on the top... Does anyone know which brands made tubes with tripple micas?
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Old 19th June 2004, 11:46 PM   #6
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sure give me a few minutes
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Old 19th June 2004, 11:53 PM   #7
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Default .

best i can do camera has a problem with the focus
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Old 20th June 2004, 12:22 AM   #8
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Hi,

If the plates have horizontally spaced ribs AND there's no acid marking on the glass to be found it could very well be a SYLVANIA ECG U.S.A. 12AX7A from the Seventies made for export exclusively.

The profile of the tube fits the bill but it's hard to be sure from just a picture no matter how well taken.

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Old 20th June 2004, 12:39 AM   #9
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well it was worth a try anyway

thanks for the help
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