|Brand on Tube||Standard|
|Extended Brand Name||Standard Radiofabrik (SRF)|
|City||Ulvsunda, Stockholm, Sweden|
|Tip Shape||Round Tip|
|Glass Color||Clear Glass|
|Getter||D-D Double Getter|
They where mainly used in the aiming device for Haubitz cannons and Bofors (Swedish military supplier) was their main client. The tube was produced very sturdily to withstand the shock from the cannon blast and therefore has five support rods and triple micas to support the inner structure. Dark brown base, muddy black plates, double D-getters and marked with white ink factory production code on the anodes; RH2050 & RH2060.