12BH7-A GE | Alldatasheet
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The 12BH7-A is a miniature, medium-mu twin triode designed primarily for BASING DIAGRAM use as a vertical-deflection amplifier in television receivers. In this application, the two sections may be employed in parallel, or they may be employed as a 6 combined vertical-deflection amplifier and vertical oscillator. The tube is also @ 6) suitable for use as the horizontal oscillator in television receivers as well as in a , wide variety of general-purpose applications. Each section of the 12BH7-A Q) S) 7?) features a relatively high plate current at low plate voltages and is capable of L] withstanding the high pulse voltages normally encountered in vertical-amplifier ((i1 applications. @) I al, (8) The 12BH7-A differs from the 12BH7 primarily by incorporating a controlled =i heater warm-up characteristic which makes the tube particularly suited for use a) (9) in television receivers which employ 600-milliampere series-connected heaters. GENERAL REINA 9A ELECTRICAL Cathode—Coated Unipotential Series Parallel TERMINAL CONNECTIONS Heater Warm-up Time*. see see : 11 Seconds Pin 3—Cathode (Section 2) Direct Interelectrode Capacitances, approximate t Pin 4—Heater Output, Section 2.00 Ob nf Pin 9-—Heater Center-Tap Plate to Plate . . . rn 08 ppt MECHANICAL PHYSICAL DIMENSIONS Mounting Position—Any Envelope—T-6¥2, Glass Fax: Base—E9-1, Small Button 9-Pin oF wax Ted ” ae RETMA 6-3
8.55 MAXIMUM RATINGS Vertical- Class A; Deflection DESIGN-CENTER VALUES UNLESS OTHERWISE INDICATED, EACH SECTION Amplifier Amplifiert DC Plate Voltage. . . see eeenee tae . oe : 300 450 Volts Peak Positive Pulse Plate Voltage... eee ee oe . cee cece eee 1500§ Volts Negative DC Grid Voltage . . cee 50 -.. Volts DC Cathode Current. . : . Senne 20 20 Milliamperes Peak Cathode Current. beens oe . . oe 70 Milliamperes Heater-Cathode Voltage Heater Positive with Respect to Cathode Total DC and Peak. . eee . s -. 200 200 Volts Heater Negative with Respect to Cathode Grid Circuit Resistance Vertical- Horizontal- Oscillator Oscillator Servicet Servicet DC Plate Voltage. see eee es . oe ee .. 450 450 Volts Peak Negative Grid Voltage. eee . 400 600 Volts DC Cathode Current. . bene : eee bee 20 20 = Milliamperes Heater-Cathode Voltage Heater Positive with Respect to Cathode Heater Negative with Respect to Cathode Grid Circuit Resistance CHARACTERISTICS AND TYPICAL OPERATION CLASS A; AMPLIFIER, EACH SECTION Plate Voltage. . see . cette eee eee ee eee eee 250 250 Volts Plate Resistance, approximate . veces wee . . . : cece ee 5300 Ohms Grid Voltage, approximate
8.55 R * Heater warm-up time is defined as the time required WYN in the circuit shown at the right for the voltage across Heater the heater terminals (V) to increase from zero to the of Tube heater test voltage (Vj). For this type, E=25.0 volts — under (RMS or DC), Vi=5.0 volts (RMS or DC) and R= Test 31.5 ohms. + Without external shield. t For operation in a 525-line, 30-frame television system as described in “Standards of Good Engineering Practice Con- cerning Television Broadcast Stations," Federal Communications Commission. The duty cycle of the voltage pulse must not exceed 15 percent of one scanning cycle. § Valve given is to be considered as an Absolute Maximum Rating. In this case, the combined effect of supply voltage variation, manufacturing variation including components in the equipment, and adjustment of equipment controls should ot cause the rated value to be exceeded, 7 in stages operating with grid-leak bias, an adequate cathode-bias resistor or other suitable means is required to pro- tect the tube in the absence of excitation. AVERAGE PLATE CHARACTERISTICS
50 EACH SECTION
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