6DA4 GEC | Alldatasheet
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6DA4—12D4—17D4 oDa 12D4 17D4 . DIODE ET-11465 Election” Page | 4-57 TUBES FOR TV DAMPING DIODE APPLICATIONS The 6DA4 is a single heater-cathode type diode for service as the damping diode in the horizontal-deflection circuit of television receivers. It will with- BASING DIAGRAM stand high pulse voltages between the heater and cathode and high inverse pulse voltages between the plate and cathode. These characteristics make the (5) tube particularly useful in autotransformer deflection systems where high pulse voltages are applied to the cathode of the damper tube. @ Except for heater ratings, the 12D4 and 17D4 are identical to the 6DA4. In addition, the 12D4 and 17D4 incorporate a controlled heater-warm-up characteristic which makes them especially suited for use in television receivers with series-connected heaters. (2) CF (7) GENERAL On (8) ELECTRICAL HA Aco Cathode—Coated Unipotential 6DA4 1204 17D4 Direct Interelectrode Capacitances, approximate fin Internal Connection} Pin 8—Heater MECHANICAL Pin 1 omitted Mounting Position—Any J Fin | omitted on B5-82 and - ases. Envelope—T-9, Glass . Base—B5-82 or B6-8, Intermediate-Shell Octal Socket terminals 1,2, 4, and or B5-85 or B6-60, Short Intermediate-Shell Octal ‘ould not be used. PHYSICAL DIMENSIONS z Pie | Max. | tT i . | 2e 3g MAX, MAX. | j / rige- MAX. GENERAL @@ ELECTRIC eno. OR 9-41
TV DAMPER SERVICE§ DESIGN-MAXIMUM VALUES Steady-State Peak Plate Current . we voces soe . 900 Milliamperes DC Output Current... bocce voce eee . 155 Milliamperes Heater-Cathode Voltage Heater Positive with Respect to Cathode Heater Negative with Respect to Cathode ee bocce eens 900 Volts Total DC and Peak... bee b bebe bette tet t ttt eresstsseseess, 4400 Volts Design-Maximum Ratings are the limiting values expressed with respect to bogie tubes at which satisfactory tube life can be expected to occur for the types of service for which the tube is rated. Therefore, the equipment designer must establish the circuit design so that initially and throughout equipment life no design-maximum valve is exceeded with a bogie tube under the worst probable operating conditions with respect to supply-voltage variation, equipment component variation, equipment control adjustment, load variation, and environmental conditions. AVERAGE CHARACTERISTICS Tube Voltage Drop * The time required for the voltage across the heater to reach 80 percent of its rated value after applying 4 times rated heater voltage to a circuit consisting of the tube heater in series with a resistance equal to 3 times the rated heater voltage divided by the rated heater current. + Without external shield. § 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. Operation of this tube as a power rectifier is not recommended.
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