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Classification- Dome-type bulb of glass, a white ceramic base with four-prong bayonet golden pins, oxide coated filamentary, mesh plate twin diode. Application -It is designed to supply direct current up to 200 miliamperes from an alternating current soure. Dimensions -Dimensions, outline diagrams of the tube and bases, and the arrangement of electrode connections to the base terminals are shown in Figures 1 and 2.

Nominal operating conditions and parameters Filament voltage* ......................................5.0V Nominal filament current ........................4A Choke-Input filter RiM-S Alternating voltage prelate ..........550V Tolal rectified current ...............................140mA Condenser-Input Filter RiM-S Alternating voltage prelate ..........450V Tolal rectified current ...............................120mA *Alternating-current filament supply or Direct-current filament supply. Characteristics-Average characteristics The current-voltage characteristic of a single diode untie of the 274A /B/+tube is shown in Figure 3. Direct-voltage output characteristics are given in Figures 4 and 5. The characteristics of Figure 4 are for a choke-input filter such as is shown in circuit A and those of Figure 6 are for a condenser-input filter such as is shown in circuit B.

Limiting Operation Conditions for Safe Nor simultaneous ratings Choke-input filter: 1 Max. R-M-S alternating Voltage per plate ..........550 V 1 Max Total Rectified Current .................................250 mA 2 Max. R-M-S Alternating Voltage per plate .........660V 2 Max. Total Rectified Current ...............................200mA Condenser-input Filter: 1 Max.R-M-S Alternating Voltage per plate .........450V 1 Max. Total Rectified Current ..............................200mA *4uF.Maximum filter input capacitance