1 / 1 2 / 2 2 , 1 0 : 3 7 A M A u d i o O p e n F r a m e ( 1 4 8 S e r i e s ) - H a m m o n d M f g . Quality Products. Service Excellence. Audio Open Frame 148 Series PC Board Mount Features Pin type (0.25 length & 0.025 square), P.C. board mount. Economical, open type, horizontal bracket construction. 149 Series includes clinching lugs for extra mounting strength. Frequency response 200 Hz. - 15 Khz. (+/- 1 db, ref. 1 Khz.). Total distortion approximately 2% for drivers and 1% for outputs at 200 Hz., decreasing at higher frequencies. Insertion loss less than 1/2 db. Bifilar wound for balanced capacitive and resistance characteristics, on pin bobbins for standard 0.2 grid pin spacing. Insulation test 250V rms. For rugged epoxy cast type units refer to our 102, 104, 106 or 107, 108 and 109 series. Net weight: 0.6 oz. (148 Series) & 1.0 oz. (149 Series). Notes: 1) For output transformers the current figure is for maximum unbalanced current. 2) D.C. resistance shown is for the total primary or secondary windings (ie...if unit contains multiple primary or secondary windings the figure shown is with the windings connected in series). 3) Pins are not labeled on the units, but a dot indicates the position of pin 1. The rest of the pins can be determined after reviewing the schematic below. h t t p s : / / w w w . h a m m f g . c o m / e l e c t r o n i c s / t r a n s f o r m e r s / a u d i o / 1 4 8 1 / 21 / 1 2 / 2 2 , 1 0 : 3 7 A M A u d i o O p e n F r a m e ( 1 4 8 S e r i e s ) - H a m m o n d M f g . Max. Primary D.C. Resistance Nominal Impedance D.C. current (Ohms) +/- 15% Schematic (Ohms) (ma.) (See Note 2) Output Drawing Part No. Applicaton Primary Secondary (See Note 1) Primary Secondary (Milliwatts) Figure 148A Input 150/600 600/2400 1.9 45 300 300 1 148B Input 150 400/1600 3.8 11.3 200 300 2 148C Input 50000 250/1000 0 1760 25.4 12 2 148D Input 200K 1000 0 1760 6.2 3 3 148E Driver 500 125/500 18 79 60 75 2 148F Driver 1500 125/500 11.6 220 58 75 2 148H Driver 3000 250/1000 7.5 480 107 75 2 148K Driver 4000 500/2000 6.5 540 230 75 2 148M Driver 6000 500/2000 5.3 850 230 75 2 148Q Driver 10000 500/2000 4.1 1700 238 75 2 148R Driver 20000 250/1000 2.4 2230 123 50 2 148T Output 500 ct 3.2 2.1 41 0.34 300 4 148V Output 600 ct 150 ct 1.9 45 14 300 5 148X Output 4000 ct 3.2 0.8 380 0 300 4 148Y Output 5000 ct 500 ct 0.7 410 52 300 5 Data subject to change without notice 2022. Hammond Manufacturing Ltd. All rights reserved. h t t p s : / / w w w . h a m m f g . c o m / e l e c t r o n i c s / t r a n s f o r m e r s / a u d i o / 1 4 8 2 / 2