Fieldcoil power supply with pair GLE15000 rectifier tubes

AZ11 power supplies from 1950

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 !!