6Р3С-1 Tubes, dual output beam tetrode

6R3S-1 6Р3С-1 Svetlana Tubes,Double output beam tetrode,New,Same Date,Lot 3 pcs. 6R3S-1 double output beam tetrode with a common cathode is designed to operate in low-frequency amplifiers. 6P3S-1 is made in a baseless glass case with 8 lower leads and 2 upper anode leads. The cathode of the two tetrodes of the lamp is a common oxide of indirect heating. The filament is tapped from the middle, which allows its halves to be connected in series or in parallel. 6R3S-1 New, in factory packaging, OTK sign. The same date of manufacture 7/80