The type 80 was the landmark full-wave rectifier and (we think) the first mass-produced rectifier to use oxide-coated tape filaments. In this exhibit from Tungsram the filament tape does not have tension springs as can be found on 80 from Rogers.
The maximum reservoir capacitor is 32 µF and the minimum series resistance, to limit current, is 30 Ohms.
One anode face view. The tape filaments enter the anode half way along the width.
A very clear view of the filament tape and how it is spot welded to the rigid supports. The oxide coating can just be seen inside the base of each of the anodes.
The classic envelope is 44 mm in diameter and, excluding the UX4 base pins, is 103 mm tall.
References: Data-sheet, private communication, 1040 & 1043. Type 80 was first introduced in 1936. See also1936 adverts.
