Can anyone ID this tube?

[pbman1953]

Can anyone tell from the marking/font what brand this could be?


Thanks

[HotBluePlates]

Can anyone tell from the marking/font what brand this could be?

The label is meaningless, nearly always.

I assume there is no diamond mark between the pins?  If not, then the flat-plate construction reveals this is an Ei tube.

[pbman1953]

There is a mark between the pins but hard to make out. I took a picture of it and after zooming in could be a diamond

[mresistor]

If there is a small diamond between the pins then it's a Telefunken. Oh sorry I see HBP already elicited this in the link he provided.


Is that a dab of RTV between the pins? 

[pbman1953]

If there is a small diamond between the pins then it's a Telefunken. Oh sorry I see HBP already elicited this in the link he provided.


Is that a dab of RTV between the pins?

Rtv?

[mresistor]

Silicon Sealant, comes in a tube usually. What exactly is this substance on the bottom of the tube between the pins?  It ain't normal, does this tube have a crack in the glass at the base?

[pbman1953]

Silicon Sealant, comes in a tube usually.

That's true there was

[pbman1953]

Silicon Sealant, comes in a tube usually. What exactly is this substance on the bottom of the tube between the pins?  It ain't normal, does this tube have a crack in the glass at the base?

Good eye, no crack,  this came out of a tube pre-amp and the tech used the sealant on the tube stabilize it

[mresistor]

Thanks for the reply   I did finally think that maybe it was for some purpose like that..   cheers. 

[HotBluePlates]

There is a mark between the pins but hard to make out. ...

99% chance it's an Ei tube.

Try looking at the getter ring instead, where the vertical post attaches.  There's an obvious tell there that will definitely say whether this tube is a
Telefunken:

   - If the getter is not a complete ring, but dips inward where the post attaches, that's a Telefunken.
   - If it doesn't dip inward (and remains a complete circle), then it's an Ei tube.

[pbman1953]

There is a mark between the pins but hard to make out. ...

99% chance it's an Ei tube.

Try looking at the getter ring instead, where the vertical post attaches.  There's an obvious tell there that will definitely say whether this tube is a
Telefunken:

   - If the getter is not a complete ring, but dips inward where the post attaches, that's a Telefunken.
   - If it doesn't dip inward (and remains a complete circle), then it's an Ei tube.

[HotBluePlates]

That is an Ei ECC83.  Flat plate (which makes people think "Telefunken"), but no inward dip at the getter mounting post.

[pbman1953]

Thanks! Still good tube, right?

[HotBluePlates]

Still a 12AX7, yes.

And Ei was at least some part of the Philips family of companies in Europe.

[pbman1953]

If it were you. would you say the EI or a long plate RCA would sound better?

[acheld]

If it were you. would you say the EI or a long plate RCA would sound better?

It's ALWAYS in the ears of the listener. 

As for me, I can't tell the difference between good (meaning "normally functioning") tubes of one brand vs another.

I've had more, but very intermittent, problems with microphony from long plate ECC83  tubes than the others; and various brands seem to be more reliable in my hands, but this is only my very biased opinion, based on scarce personal data.  I admit that I like Telefunken tubes based on the name alone.

Once upon a time, I tried to listen to as many tubes in this comparator https://www.tubedepot.com/pages/tube-comparison-tool as I could.  I really couldn't tell any differences.   But I am old.   You certainly may hear differences!   That's why it is dealer's choice!

[Willabe]

They say that Telefunken tubes were some of the finest vacuum tubes ever made. They say they last forever because of the build quality, the materials and the vacuum.   

[pbman1953]

If it were you. would you say the EI or a long plate RCA would sound better?

It's ALWAYS in the ears of the listener. 

As for me, I can't tell the difference between good (meaning "normally functioning") tubes of one brand vs another.

I've had more, but very intermittent, problems with microphony from long plate ECC83  tubes than the others; and various brands seem to be more reliable in my hands, but this is only my very biased opinion, based on scarce personal data.  I admit that I like Telefunken tubes based on the name alone.

Once upon a time, I tried to listen to as many tubes in this comparator https://www.tubedepot.com/pages/tube-comparison-tool as I could.  I really couldn't tell any differences.   But I am old.   You certainly may hear differences!   That's why it is dealer's choice!

Thanks for the link! I swapped back and forth and the Ei won. The Ei was similar to the RCA in mid and high end but the lows were tighter and not as blossomy.   Can't say blossom is bad but for what I do t sounded better

[bmccowan]

They say that Telefunken tubes were some of the finest vacuum tubes ever made. They say they last forever because of the build quality, the materials and the vacuum.

Those "They" folks are really smart. And I'm wondering, did Telefunken use up all that special vacuum or is it available somewhere? Very funny Willabe!

[Willabe]

They say that Telefunken tubes were some of the finest vacuum tubes ever made. They say they last forever because of the build quality, the materials and the vacuum.

Those "They" folks are really smart. And I'm wondering, did Telefunken use up all that special vacuum or is it available somewhere? Very funny Willabe!

What the hell is going on here?

You got a problem with me?

[bmccowan]

They say that Telefunken tubes were some of the finest vacuum tubes ever made. They say they last forever because of the build quality, the materials and the vacuum.

Those "They" folks are really smart. And I'm wondering, did Telefunken use up all that special vacuum or is it available somewhere? Very funny Willabe!

What the hell is going on here?

You got a problem with me?

Being funny is never a problem. Is it?
Cheers

[Willabe]

Really?

Your not being funny, your takin a poke at me, being a smart ass and you know it.

What's the real problem? 

[bmccowan]

There is no problem.
I thought you were being funny - maybe I was mistaken? I always think the "they" pronoun is funny. So I thought you were poking fun at some Telefunken (they) promo claims. ("last forever") forever is a long time. No?
Definitely no poke at you - just the opposite - as humor helps keep us out of drudgery.
Again, cheers! 

[Willabe]

I hope this is true because I always thought you were a good guy and enjoy your input here.

I'm truly sorry if I got this wrong. Forgive me.

[bmccowan]

I hope this is true because I always thought you were a good guy and enjoy your input here.

I'm truly sorry if I got this wrong. Forgive me.

Willabe, It is absolutely 100% true. I am an extremely honest person. I am one of those Scots that believes that honor is the most important virtue we can hold.
I am also a person who tends to see humor all around us. I often hear, "why are you laughing?" So no worries - no foul, as they say. (see what I mean?)
I have great respect for you and the other moderators here and strive to contribute productively, along with the occasional attempts to make people smile.
Regards

[Willabe]

Ok, good. Sorry again, my mistake.