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Input Transformers INPUT TRANSFORMERS MANUFACTURE JANUARY 1965 DISCONTINUED (Pile ss Card 1 on Input Transformers) The manufacture of the following input tranformers has been discontinued and it is not considered necessary to maintain cmplete information in the catalogue. For information on codes not listed below, see other cards on input transformers. Code Replaced by Code Replaced by Code Replaced by Code Replaced by 2OOA & B 215A 227C 243B 2olA to T 216A 2288 & B 244A 202A 218B 218G 229A 245A & B 203A to G 218C to F 230A & B 246A 205A to F 218R to N 231A 246C 207A 219A 2328 & B 247B 208A to L 220A 221D 233A & B 247D to H 208M 2408 220B 221D 233C 281A recom. 247K to N 208N to T 221B 224B 2333 & F 2488 208U 231B 221c 224C 233H 272C recm. 250A & B 208W & Y 221D 224A 2335 251A & D 208AA 223B 222A 233L 252B 208AB 223A to D 2348 to D 2538 208AD 224A 234A 2358 2548 208AF to AH 224B 234B 2368 255B to C 209A & B 224C 238A 2553 to H 210A to E 2258 & B 2398 2555 255K 211A to C 2268 240B to J 255K 212A & B 226B <a, 241A & B 256A 212c 618B recom. 226C 233B 241D 2578 213A to C 226D to H 2428 242B 2588 (a) Replaced by a 634B together with one PlZA710 adapter, one P16A771 instruction sheet, form Pl11869 screws and four P242132 washers. INPUT TRANSFORMERS JAUUAK!l 1965 I (File as Card 2 on In1 put Transformers) I Coda Replaced by Code Replaced by Code Replaced by Code Replaced by 259A&B 274A 292D & E 633A 633G 26OAbrB 274C 298A 298B 633B 6331 261A 275A 299B 614A 633D 262A 2JJA to C 600B 638D 263A 279A 601A 6438 DlJ6227 264D 282C 603B 6448 265A to C 285A to D 611A 64JA 64JB 2668 61 B 285G to J 612A 64JC (a> 26JA 285N 613A 65JA 6 B 268A D93983 285B 614A 661B 2698 286A 615A 662A 2JOA to C 28811 2886 61JA 664A 663B 2JOE 288C 618D 669C 2JOF 2705 288D 618B raccm. 6228 672A 271A to K 2883 & F 629A 646B 6220A 272AErB 290A 630A (a) Replaced by 647D plus P13A263 instruction sheet. MARCH 1971 NE-213D INPUT TRANSFORMER STANDARD Shell type coil enclosed in a metal case. Has an impedance ratio of 200 to 320,000 between windings (l-2) and (3-4). Approximate dc resistance of windings (l-2) and (3-4) is 29.6 and 7826 ohms, respectively. Arranged to mount on mounting plates. SEE RATINGS MAY 1972 NE-218 TYPE INPUT TRANSFORMERS BELOW I I Unpotted shell type transformers consisting of a coil wound on an insulated spool and assembled on a steel laminated core. Arranged to mount by two steel brackets which clamps to the core. Approximate overall dimensions are 3.188 inches high, by 2.0 inches long at the brackets, by 1.750 inches wide. For use in the 5A, 6A, and 7A amplifiers. NE-218A: Has four taps on the outer winding brought out to terminals. The ratio of transformation is variable from approximately 2 to 1, by means of taps, down to 0.35 to 1. NE-218G: The ratio of transformation between the inner windings and ttle two middle windings connected in series aiding is approximately 1 to 3.8. Frequency Impedance (a)lnductance Code Winding Range (Hertz) Ratio (Ohms) (Henrys) Rating [25 yin] NE-218A 20,000 to 80,000 Standard (8 NE-218G 100 to 3000 20,000 to 290,000 (a) Tested at 900 hertz with a 3 volt drop across winding. PROPERTIoFTHE Norrbern F/ethic MARCH 1971 NE-2318 INPUT TRANSFORMER STANDARD 3,;” Shell type transformer enclosed in a crosstalk-proof case arranged to mount on mounting plates. Has three windings. Resistance of inner windings (l-2) and (3-4) is approximately 33 ohms each, and of outer winding (5-6) is approximately 8,695 ohms. Impedance ratio of windings (l-2.) (3-4) to (5-6) is 300 to 300,000. I STANDARD 233-D INP6T TFL'iNSFORKER I 1 ./I : ., Has a shell type permalloy core and is potted in a cast-iron c&se.,'-Has'an impedke ratio of 20,000 to 50;OO0 ohms between windings (l-2) (5-6) and (3-h) (7-8) and. oIj;e<rates over a .frequency range' of 60 to 5000 cycles. Approximate DC resistance of windings '(l-2) and (5-6) in series is 2800 ohms and of windings (3-k) and, (7-8) in series is 4900 ohms, Measures over-all approximately 3-1/l+" by 2-5/8" by 4" high. Intended for use in the 32-A amplifier and operates between two 236-D vacuum tubes. Does not replace or affect the demand for any existing apparatus.. No. TYPE INPUT TRANSFORMERS SEE RATINGS .JANUARY 1965 240 BELOW Shell type transformers enclosed in metal cases arranged to mount on mounting plates. No. of Approx. Resistance Code Fig. Wind---- of Each-.__- Winding~.~.__--.--. (Ohms) ~_ Impedance No. No. ings (1-2) (3-4) (5-6) (7-8) (5-12) Ratio Rating - ..~ (c)(d)240A 4 3 Cb)155 - -5420(a) 1 ~28 . 5 i Standard FIG 2 24OC 1 4 G 400 G 400 -- (*) 620- 44800 NOT MANUF 24OD 1 4 6.5 3250 c.5 3250 - (‘:) 150-1,“oooo “ “ 240E 2 2 55 “70 - -- (.I) 4400-146000 “ “ 2408' 1 4 5s 1640 58 l640- (*) G40-240000 " (‘ 240G 1 4 40 1083 40 1083 - (*) G40-240000 “ 1‘ 240H 8 4 750 5000 750 5000- (*) 20000-500000 “ (‘ ( p ) Windings (l-2) (5-G) in series to (3-4) (‘7-8) in series. &-~z-xd_ -; _ f (-1-j Windin& (l-2‘) to (i-4). I~ NOS.240-C.D.F;G,ALSO (a) Windinrrs (l-2) (3-4) to (5-12). Taus cj.7.8.9.10,11,12 are 4.73 db each. GENERAL DESIGN AND ib) Windings il-2j (3-4j in series. ^ . DIMENSIONS OF NO. 240 (c) Provided with an extra terminal at “A.” (d) Replaces No. 208M. TYPE FIG 4 STANDARD JANUARY 1965 2f+'j'A INPUT TRANSFORMER Designed to work from a 250 ohm resistance into a 23lD vacuum tube. Has an impedance ratio of 250 to 159,000 ohms between windings (l-2), (3-4) and (5-6) and operates over a frequency range from 35 to 10,000 cycles. Average DC resistance at 68O F. of windings (l-2) and (3-4) connected in series is approximately 75 ohms, of winding (5-6) is approately 5700 ohms. Over-all dimensions are approximately 2-7/8" x 2-7/8" x 4"* Originally intended for use in the 46~ amplifier. Also used in the 162Bl hit indi- cator circuit SD-70097-01. Has a small shell type core of per:nal..loy and is potted in a circular pressed steel can. Does not replace any apparatus. , 8 PR o PE R T Y Norfbern Efectric Company L I MI TE D 249A INPUT TRANSFORMER STANDARD .TANUARY 1965 i I Has an iqedance ratio of 20,000 to 50,000 ohms between the windings (l-2) (5-6) and (3-4) (7-81, and is designed to cover the frequent range of 60 to 5,000 cycles. The average DC resistance of windings (l-2) and (5-6 5 connected in series is 2830 ohms. Ttle average DC resistance of windings (3-4) and (7-8) connected in series is 4520 ohms. Has a shell type l+51i pemalloy core and is potted in a cast iron case, keasures overall approximately 2-5/8" x 3-3/16" x 3-15/l@. Intended for use as a low frequency oscillating coil in the 14-A and 15-A band fre- quency oscillators for cross-talk measurements. Does not replace any aprxwatus. SEE RATINGS JUNE 1972 NE-255 TYPE INPUT TRANSFORMERS BELOW Each consists of windings on a permalloy core and enclosed in a metal case, Closest recommended mounting centres are 3.50 inches by 2.625 inches. NE-255L: Has a turns ratio of 22.4 to 1 between windings (3-5) and (l-2) and is intended to operate at 300 hertz. Intended for use in SD68190-01 test set in toll systems. NE-255M: -&i$ -z NE-255M Has an impedance ratio of 300 to 307,200 between windings - OTHERWISE SAME (2-l), (6-5), and (4-3), (8-7) and is intended to operate over AS NE-255L MAXT*-.$- c the frequency range of 1000 to 3000 hertz. t- Has an electrostatic shield between windings (2-l), (6-5), and (4-3), (8-7) connected to terminal S. Intended for use in SD95536-011 signalling receiving circuit in common systems. Approximate dc Resistance of Winding (Ohms) NE-255L Code (l-2) (3-4) (3-5) (5-6) (7-8) Rating NE-255L 130 4000 Standard II NE-255M (a) (3 - (a) (4 (a) Approximate dc resistance of windings (l-2) and (5-6) connected in series is 22 ohms and of windings (3-4) and (7-8) connected in series is 5800 ohms. STANDARD MARCH 1971 NE-266D INPUT TRANSFORMER Shell type coil enclosed in a metal case. Approximate dc resistance of windings (l-2) (3-4) and (5-6) is 12.5, 12.5 and 7,000 ohms, respectively. Has an impedance ratio of 200 to 100,000 between windings (l-2) (3-4) and (5-6). Operates over the frequency range of 100 to 5,000 hertz. Closest recommended mounting centres are 2.625 inches by 3.500 inches.
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