The 6/30L2 is a general purpose double triode with a screen between the sections. Their main applications are found in television receivers.
Construction: two part anode stitched together, close wound grid on copper rod supports and rectangular cathode tube.
The two sections with a Z shaped screen between.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 49 mm tall.
References: Data-sheet & 1040 Type 6/30L2 was first introduced in 1958.