125B

Hammond Mfg. Co. Ltd., Electronics Division www.hammfg.com 125B UNIVERSAL PUSH-PULL “CLASSIC” TUBE OUTPUT TRANSFORMER         Designed for general purpose or replacement use in push-pull tube output circuits. For single ended use, see our 125SE Series. Frequency response: 150 Hz. - 15 Khz at full rated power (+/- 1db max. ref. 1 Khz) also see graphs for more detailed response data Open style with minimum 5" long primary leads. Secondary solder lugs for convenient secondary connections (except 125B - uses minimum 5" secondary leads). Primary impedances from 1,200 to 25,000 Ohms. (For the full range of impedances see page 6) Secondary impedances from 1.5 to 15 Ohms. Designed for general purpose or replacement use (not Hi-Fi), in tube output circuits. GRN (3) ORG (2) BLK (1) WHT (6) BLU VIO (5) YEL (4) RED BRN Hammond Mfg. Co. Ltd., Electronics Division www.hammfg.com ELECTRICAL SPECIFICATIONS** Characteristic Input Impedance Output Impedance Output Power Primary - DCR Blue – Brown Secondary DCR 1–2 1–3 1–4 1–5 1–6 Inductance Primary – Blue – Brown Sec – 1 – 2 Sec – 1 – 3 Sec – 1 – 4 Sec – 1 – 5 Sec – 1 – 6 Impedance Primary – Blue – Brown Sec – 1 – 2 Sec – 1 – 3 Sec – 1 – 4 Sec – 1 – 5 Sec – 1 – 6 Frequency Response Dielectric Strength Temperature Range Typical 1200 - 25000  1.5 - 15  5 Watts Schematic and Hook Up Data PRIMARY SCHEMATIC SECONDARY BRN (PLATE) WHT (6) 296  143 m 290 m 443 m 608 m 788 m @ 1.0 kHz, 1.0 V OC 3.70 Hy 0.22 mH 1.52 mH 2.97 mH 10.9 mH 19.1 mH @ 1.0 kHz, 1.0 V OC 16.7 K 1.27  7.58  20.6  46.7  86.4  See graphs for specific response, Typ. 1.0db from 100Hz to 15KHz 1500Vrms Up to 105C VIO (5) YEL (4) RED (B+) GRN (3) ORG (2) BLU (PLATE) BLK (1) 125B DATE CODE 5 WATTS MADE IN CANADA Hammond Mfg. Co. Ltd., Electronics Division www.hammfg.com Hammond Mfg. Co. Ltd., Electronics Division www.hammfg.com Hammond Mfg. Co. Ltd., Electronics Division www.hammfg.com Hammond Mfg. Co. Ltd., Electronics Division www.hammfg.com Hook-Up Data Connect Speaker To (Secondary Lugs) 1&2 2&3 3&4 4&5 5&6 1&3 2&4 3&5 4&6 1&4 2&5 3&6 1&5 2&6 1&6 1.5 Voice Coil Impedance (Ohms) 3.2 4 6 8 2 12 15 Resulting Total Primary Impedance (Below), Blue Wire to Brown Wire (Ohms) 27000 18000 16500 10000 8500 5400 4200 3300 2400 2150 1550 1300 - 24000 22000 13500 11000 7200 5600 4400 3200 2900 2050 1700 1400 - 21600 18000 11500 9000 7000 5100 4600 3300 2700 2200 1700 1200 PRIMARY TYPICAL TEST CIRCUIT R S/ 27000 22000 15000 11200 8800 6400 5800 4100 3400 2800 2100 1500 21600 16800 13200 9600 8700 6150 5100 4200 3150 2300 26400 19200 17400 12300 10200 8400 6300 4500 24000 21500 15500 12800 10200 8000 5600 SECONDARY 2 RL Measurement instruments Hp4192a impedance analyzer Hp3456a DVM Keithley 2002 DVM D scope series iii audio analyzer Wayne Kerr 3255B with a 3265B 22500 17600 12800 11600 8200 6800 5600 4200 3000 R S/ OUT 2 * All graphs input level 20dbu. ** The results are typical and are subject to normal manufacturing and electrical tolerances. This drawing and the information in it is the property of Hammond Manufacturing. It may not be reproduced, transmitted or used in any manner whatsoever without the written permission of Hammond Manufacturing. Data subject to change without notice. Revision 1: 05.25.2021