Tube I.D.

[playittwice]

Another tube I.D. needed.
I found this one with some other tubes I have. There are no markings on it. Not sure if it’s a 12ax7, 7025, or 5751 or…..
Thanks.

 

[ceylon]

ive got a good idea of what you got, but the pics are very dark. can you please post 5 more or so going around the entire tube except the top and bottom between the pics, well-lit and clear with no glare to see the entire structure?

of you could, please, i would like a clear, well-lit look at the pins as well, but not lookin strait ahead at the base.

 

[playittwice]

Here ya go.

 

[Mr Boochie]

Another tube I.D. needed.
I found this one with some other tubes I have. There are no markings on it. Not sure if it’s a 12ax7, 7025, or 5751 or…..
Thanks.
View attachment 3418579View attachment 3418580View attachment 3418582View attachment 3418581

You don't happen to have access to a tube tester?

 

[playittwice]

I do not

 

[playittwice]

Not a big deal if I can’t determine what it is, just a curiosity thing.

 

[Mr Boochie]

I enlarged a couple of photos. This may help the ID process.

 

[ceylon]

i must change my mind. it is missing a telltale siemens characteristic or two. this is a philips short plate or a copy or if.

 

[Mr Boochie]

If a 12AX7 variant, its siemens ECC83

some have no visible codes.

Here's my blurry photo of a Siemens-Halske (Munich) ECC83.

 

[ceylon]

Here's my blurry photo of a Siemens-Halske (Munich) ECC83.

View attachment 3418732
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+.3/0

i had to change my mind--its missing soe structural norms.

 

[Mr Boochie]

i had to change my mind--its missing soe structural norms.

It would be nice to know if it's a 12AU7, AT7, or AX7.

 

[ceylon]

check out these bel india

 

[Mr Boochie]

This is an off-topic bit of trivia: something I found on the Net.

Telefunken difference between 12AU7 and 12AX7 (ECC82 and ECC83)

I've solved the mystery of the distinction between 12AX7 and 12AU7 Telefunken.
It depends on the position of the getter support.
I've checked a dozen Telefunken tubes and found out the consistent location of the getter support of the two:

When the getter support is on the 1st pin, it's 12AX7,
When the getter support is on the 3rd pin, it's 12AU7.

The plate structures look identical.

Thanks to everybody for the feedback and input!

 

[zackthedog]

Or a Matsushita 12AX7. They typically have tilted ring and getter.

 

[ceylon]

Or a Matsushita 12AX7. They typically have tilted ring and getter.

oh yea... the early ones have tilted getter the later ones dont.

 

[playittwice]

Thank you folks for your research and feedback. I have had an amp that had a/some Matsushita tubes in it, it’s been a while ago, so I can’t remember which one it may have come out of. So it’s a fairly good possibility it is a Matsushita.

Has it been confirmed it is a 12ax7?

 

[ceylon]

Thank you folks for your research and feedback. I have had an amp that had a/some Matsushita tubes in it, it’s been a while ago, so I can’t remember which one it may have come out of. So it’s a fairly good possibility it is a Matsushita.

very possible

Has it been confirmed it is a 12ax7?

nope.

 

[Mr Boochie]

So it’s a fairly good possibility it is a Matsushita.

Matsushita 9-pin minis usually have two cross-hatched seams at the top of the tube.

 

[ceylon]

Matsushita 9-pin minis usually have two cross-hatched seams at the top of the tube.

hence the suggestion it may be matsushita