Telefunken 1938 fieldcoil speaker , powered by pair AEG G10/1i mercury rectifier PSU´s

Fieldcoil power supply with pair GLE15000 rectifier tubes

AZ11 power supplies from 1950

Monodyn PSU with Mercury rectifier , using AEG 1929 tubes

Monodyn PSU universe

AEG mercury rectifier with 1920ies tubes

DC rectifier with pair PY500A tubes

Power supply with RGN2004 for Telefunken ELA L 45 ( KL L 42006 )

a real "monster " professional PSU made by RFT , type: 4 NG 1 ; uses 6 * EL34 !!