1、EIA 212-A b1 m 3234600 00b3267 3 m OCTOBER, 1 96 1 -. - r NUMBERING OF ELECTRODES and DESIGNATION OF UNITS in ELECTRON TUBES ELECTRONIC INDUSTRIES ASSOCLATION (Revieion of RS-212) (Reaffirmed November I9 70) STANDARD RS-212.A Formulated by IEDEC Elecfron Tube Council EIA 212-A b1 3234b00 0063268 5 =
2、 ., i NOTICE These standards, adopted and issued by the Electronic Industries Association were formulated by the Electron Tube Council of the Joint Electron Device Engineering Councils. EIA Standards are adopted in the public interest and are designed to eliminate misunderstand- ings between the man
3、ufacturer and the purchaser and to assist the purchaser in selecting and obtaining without delay the proper product for his particular need. Existence of such standards does not in any respect preclude any member or non-member of EIA from manufacturing or selling products not conforming to the stand
4、ard. Any proposal of recommended standards and practices made by the Association is without any regard to whether or not their adoption may in any way involve patents on articles, materials or processes. By such action, the Association does not assume any liability to any patent owner, nor does it a
5、ssume any obligation whatever to parties adopting the recommended standards or practices. Published by ELECTRONIC INDUSTRIES ASSOCIATION Engineering Department 2001 Eye Street, N.W., Washington, D.C. 20006 Copyright 1961 by Electronic Induetria Ansociation All rlphta -4 price: $1.00 - _- _- _- Print
6、ed in U.S.A. . 4 EIA 212-A b1 3234600 00b32b9 7 .-=A RS-2 1 2-A Page 1 NUMBEXUNG OF ELECTRODES and DESIGNATION OF UNICTS IN ELECTRON TUBES (From Standarh Proposal No. ?YO* and Standard RS-212 formulated under the cognizance of JEDEC Committee JT-8 on Mechanical Standccrdizaton) 1. This standara give
7、s the system used for numbering electrodes of the same type in multielectrode tubes; and for assigning designations to the units of multiple-unit tubes. For tubes made with two or more similar units, the numbering of the units is given, as derived from the basing arrangement. It shall not be used to
8、 determine the basing arrangement of any type. The designations determined from this standard shall also apply to other tube elements, such as heaters, shields, etc. 2. In single-unit tubes having more than one electrode of the same type, such as in multigrid tubes, such multiple electrodes shall be
9、 numbered consecutively starting with the one nearer the cathode. Thus, in the case of multigrid tubes, the grid nearer the cathode shall be designated grid 1, the next outward from the cathode, grid 2, etc. Electrodes of the same type when located at the same distance from a common cathode and acti
10、ng on the same electron stream shall be designated by the appro- priate number suffixed by A, B, etc. Thus, in the case of two independent co-planar grids No. 1, one shall be designated as grid 1A and the other as grid 1B. An exception is given under Section 6. 3. In multiple-unit tubes, where the u
11、nits are similar and each has more than one electrode of the same type, as in twin pentodes, such similar electrodes in each unit shall be numbered according to the method for numbering electrodes of the same type in single-unit tubes. In multiple-unit tubes, where the units are different, each unit
12、 shall be referenced by the name that would be assigned if the unit were a single-unit tube, such as diode, triode, pentode, etc. 4. In numbering two or more similar units in multiple-unit tubes, such as twin diodes, the highest number shall be assigned to that unit having an electrode connected to
13、the lowest-numbered base pin, and successively lower numbers shall be assigned to additional units according to the sequence in which the connections of the same electrode in all units are made to successively higher-numbered base pins. When similar units have one or more electrodes in common, the a
14、ssignment of unit designations shall be determined by whichever independent electrode of the unit is connected to the . lowestinumbered base pin. Once established, the unit number. shall apply to all independent electrodes of that unit. 5. The unit designation may be associated with the designation
15、of an electrode of the unit by words or by symbols in any convenient manner. 6. It shall be standard in cathode-ray tubes having two pairs of electrostatic deflecting electrodes to number the deflecting electrodes as follows : The two deflecting electrodes nearer the screen shall be numbered 1 and 2
16、; those nearer the cathode, 3 and 4. The following procedure shall be used to number the individual deflecting electrodes: Of the two electrodes nearer the screen, the one con- nected to the lowest-numbered base pin shall be designated number 2. The remaining deflecting electrodes shall be numbered
17、according to the diagram below. Orientation of deflecting electrodes as vtewed from the base end of tube. EIA 212-A bL 3234600 0063270 3 = ,& _.- RS-2 1 2-A Page 2 Exmplss: Type 6BU8 is a double Pentode consisting of a common cathode, a common grid 1, a common grid 2, separate grids 3, and separate
18、plates. The independent electrode connected to the lowest- numbered base pin is a plate (connected to pin 3). Therefore, the unit having this plate is identified as No. 2, and the other unit is identified as No. 1. 9FG Pin 1 : Cathode Pin 2 : Grid 2 and Internal Shield Pin 3 : #2 Pentode Plate Pins
19、4 and 6 : Heater Pin 6 : #2 Pentode Grid 3 Pin7: Grid1 Pin 8: #1 Pentode Plate Pin 9 : #1 Pentode Grid 3 Type 12AT6 is a double diode-triode consisting of a common cathode, a grid, a plate, and two diode plates. The independent electrode of the two similar units connected to the lowest-numbered base pin is a plate (connected to pin 6). Therefore, the diode unit. having this plate is identified as No. 2, and the other diode unit is identified as No. 1. Pin 1 : Triode Grid Pin 6 : #2 Diode Plate Pin 2 : Cathode Pin 6: #1 Diode Plate Pins 3 and 4 : Heater Pin 7 : Triode Plate - - . - -
