Some audio tubes were pretty typical for the Siemens / Klangfilm amps after WWII. You will find different construction types of these on the linked pages.

● ECC40

EF40 ● 

● EF12 and EF12k = Klangfilm KL-70715 / 70716

EF804 and EF804S ● 

● EL12 and EL12/375 = Klangfilm KL-73550

F2a11 = Klangfilm KL-73551  ● 

Klick here for tubes not listed here (EL84, ECC83, EL34 .... ).

Please note that this link will lead you out of the tube-classics's Siemens / Klangfilm section (use the "back" buttom from your browser to navigate back).