Tube ID?

[Aerobat]

This one has no markings, I tried a microscope and freezing it, looking at an angle under bright light, etc. An ID would be appreciated. It measures 21x41mm.

 

[gadget73]

looks like a triode/pentode of some flavor, but no idea which. 6U8, 6GH8, 6BL8, something like that.

 

[eiraved]

Appears to be a 12AX7/ECC83-style tube, possibly a Shuguang.

 

[billyz]

Chinese Shuguang 12ax7 gets my vote as well.

 

[Aerobat]

Possibly a 12AT7?

 

[Mr Boochie]

Really, the Shuguang isn’t that bad a tube. A little bass-shy and pushed in the top end. Good for combo amps and lead work

I don't find much difference between the Shugaung 12AX7A and the 12AX7B.

 

[Mr Boochie]

Possibly a 12AT7?

The Shuguang 12AT7 seemed to have smaller, thinner plates. IMHO.

 

[mr_macgee]

Does the tube in the OP look like it has a solid square dish getter, above the triple mica? Tube pics and angles can be deceiving, so I could very well be wrong. It does look very similar to eiraved's suggestion, and chinese. The OP's tube also appears to have copper wire leads.

 

[DirtyErnie]

Try to follow the pins to different electrodes in the tube, if you can come up with some kind of pin-out, that would help narrow things down.

I'm voting for Chinese, though

 

[QE_Eng]

Wow. I never had one of those. I was baffled!

 

[Lavane]

Really, the Shuguang isn’t that bad a tube. A little bass-shy and pushed in the top end. Good for combo amps and lead work

I don't find much difference between the Shugaung 12AX7A and the 12AX7B.

I uave a baggie of Chinese signal tubes. 6N1's, 6N2's, 6N3's, etc. They're all bass shy and bright sounding. A lot of them are microphonic too. Nothing new manufacture though.
I do have one old stock Chinese 6N2 that sounds good. One out of the three 6N2's ain't bad I guess. I like the Russian 6N2P-EV better though.

 

[maxhifi]

Looks like a Chinese 12AX7 to me too

 

[Aerobat]

Does the tube in the OP look like it has a solid square dish getter, above the triple mica? Tube pics and angles can be deceiving, so I could very well be wrong. It does look very similar to eiraved's suggestion, and chinese. The OP's tube also appears to have copper wire leads.

Yes solid square dish. The pinout seems to match a 12AX7.