21LR8 GEC | Alldatasheet
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Technical content
«TUBES. ~_____ FOR TV VERTICAL-DEFLECTION OSCILLATOR a —r—r—Cc AND AMPLIFIER APPLICATIONS The 21LR8 is a triode-pentode containing a high-mu triode and a beam pentode. The triode is designed for service as a vertical-deflection oscillator, and the pentode as a vertical-deflection amplifier in television receivers. The 21LR8 utilizes a T-12 bulb and features a 9-pin glass button base with a 0.687-inch pin circle. Except for heater characteristics, the 21LR8 is identical to the 6LR8. GENERAL ELECTRICAL Cathode - Coated Unipotential Heater Characteristics and Ratings Heater Voltage, AC Or DC .... cece cece eee eect eee eee eee eee e eee e teen eet eeeteeeteeeeeetsssseeeeeeees 20 Volts NOTES * Heater voltage for a bogey tube at If = 0.45 amperes. 4 The time required for the voltage across the heater to reach © The equipment designer should design the equipment so that 80 percent of the bogey value after applying 4 times the heater current is centered at the specified bogey value, with bogey heater voltage to a circuit consisting of the tube heater supply variations restricted to maintain heater cur- heater in series with a resistance equal to 3 times the rent within the specified tolerance . bogey heater voltage divided by the bogey heater current.