EL12N Powertube with 12-pin steelsocket Y8A- it is made in Germany.
It is very similar to EL...

Fits to our UX8 connector
ideal for 6C33C (6S33S) Amps and strong Power supplies
...

tube example (german 9´s series): DF91, EC90, EC903, EL95, 50C5
use for: PCB (PC-board) moun...

the triode system is 100% a half 12AX7 system,
therefore a cheap possibility to use in 12AX7 ...

Noval B9A 9-Pin tube-valve-base-Röhrensockel
ECF 802 Triode/Pentode
...

Septar tubebase
=SRS4452 RFT made
...

6J4 Triode for your budget projects and Audio amplifiers
it is asingle Triode like the 6AB4/...

Noval B9A 9-Pin tube-valve-base-Röhrensockel
ECL 81 Triode/Pentode
...

=E81L with Uf=20V
Noval B9A 9-Pin base
...