Classification-Dome-type or Globe-type bulb of glass, a four-prong bayonet pin tube,comprises to oxide coated filamentary diode units with a common filament.
Application-It is designed to supply direct current up to 200 milliamperes from an alternating current source.
Dimensions-Dimensions, outline diagrams of the tube and bases, and the arrangement of electrode connections to the base terminals are shown in Figures 1, 2 and 3.
![](../ziliao/274A-B.jpg)
Nominal operating conditions and parameters
Filament voltageˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇ5.0 V*
Nominal filament currentˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇ2.0A
Choke-Input filter
R-M-S Alternating voltage prelate ˇˇˇˇˇˇˇˇˇˇˇˇˇ550V
Tolal rectified currentˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇ112 mA
Condenser-Input Filter
R-M-S Alternating voltage prelateˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇ450V
Tolal rectified currentˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇ98mA
*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 4.Direct-voltage output characteristics are given in Figures 5 and 6.The characteristics of figure 5 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 Sate Operation:
Choke-input Filter:
I.Max.R-M-S Alternating Voltage per plateˇˇˇˇˇˇˇˇˇˇ550 V
I. Max Total Rectified Currentˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇ.140mA
II.Max.R-M-S Alternating Voltage per plateˇˇˇˇˇˇˇˇˇˇ660 V
II.Max. Total Rectified Currentˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇ120mA
Condenser-input Filter:
I.Max.R-M-S Alternating Voltage per plateˇˇˇˇˇˇˇˇˇˇ450 V
I.Max. Total Rectified Currentˇˇˇˇˇˇˇˇˇˇˇˇˇˇˇ.105mA
*4uF.Maximum filter input capacitance
![](../ziliao/274-qx2.jpg)
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