The AZ11 directly heated full wave rectifier is fitted with an eight pin footless base. The AZ1 is electrically identical but fitted with a Ct8 side contact base. The later AZ41 was the 1947 replacement and has a B8A base.
It has a 4 Volt filament rated at 1.1 Amp. The maximum anode RMS voltage is 500 Volts. At this anode Voltage the DC current could be up to 60 mA. At 400 Volts on the anode the output could rise to 75 mA and with 300 Volts on the anodes the output current could be 100 mA. The maximum reservoir capacitor had to be no more than 60 µF. In some data sources the maximum anode voltage is given as 300 Volts while others quote 500 Volts. All agree that the current is 60 mA maximum. The AZ12 has a maximum current of 120 mA.
The footless base.
The original box.
Rogers and Philips on the box.
Thanks to Mark Mallison for sending the images.
The classic envelope is mm in diameter and, excluding the footless base pins, is mm tall.
Reference: Data-sheet. Type AZ11 was first introduced in 1938. See also1938 adverts.
