This type of tube was produced in two versions: a fine grid model and a big grid model (the model of this page) by “Anode” in the city of Dyatkovo, Russia. It is a quite common model: I bought it for 1,60$ in February 2019, but it has a peculiarity: the base of this tube is reinforced with Bakelite. This model uses the U11 socket.
|type||-||IN-1 large grid|
|symbols||-||0, 1, 2, 3, 4, 5, 6, 7, 8, 9|
|dimensions||mm||⌀ 35 x 65|
|socket or alternative||-||U11, 2.36 mm pins|