12ax7 ID help?

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12ax7 ID help?

Postby power lover on Sat May 30, 2015 12:00 am

anyone know what these might be? and if the last 3 are all the same tube (amperex perhaps)?


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Re: 12ax7 ID help?

Postby Lyre-crunch on Wed Jun 03, 2015 6:09 am

Are there any codes around the base? These are definitely the Mullard/Philips type, which could be from Holland, Canada or India. If there are no codes, then made in India is the probable option. Mullards have only one clear seam at the top, so that rules them out.
Last edited by Lyre-crunch on Wed Jun 03, 2015 6:46 am, edited 1 time in total.
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Re: 12ax7 ID help?

Postby power lover on Wed Jun 03, 2015 6:32 am

no codes on bottom.....after some research, it seems they are holland amperex is my newest guess? but you are suggesting they are mullards so now I don't know for sure.
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Re: 12ax7 ID help?

Postby Lyre-crunch on Wed Jun 03, 2015 6:52 am

Ah, I was editing my post. First time real time posting. :D

No not Mullards, because yours have two seams crossed. If there's not even a hint of worn off code then BEL India is my first guess. Then there's some Japanese production that I recall from posts on this board that also have this same construction. How do they sound?
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Re: 12ax7 ID help?

Postby OldSchoolDave on Wed Jun 03, 2015 2:35 pm

Lyre-crunch wrote:Then there's some Japanese production that I recall from posts on this board that also have this same construction.


That's what I was thinking. Reference this thread: http://www.thegearpage.net/board/index. ... x7.673187/

The Japanese tubes made with Mullard/Philips tooling are well regarded. Not worth the same premium as the "brand names", but usually preferable to new production.

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