Push - Pull Audiophile - Output (1608-1650 "A" Series) Tube Audio PUSH - PULL "EASY HOOK-UP" "CLASSIC" TUBE TYPE - ULTRA-LINEAR OUTPUT TRANSFORMERS • NEW & Improved version of our 1608-1650 series output transformers (re-designed secondaries for easy hookup of secondary loads) • Designed for push-pull tube output circuits. • Enclosed (shielded), 4 slot, above chassis Type "X" mounting. • Frequency response 30 Hz. to 30 Khz. at full rated power (+/- 1 db max. - ref. 1 Khz) minimum. Except the 1650E (70 Hz. to 30 Khz. +/- 1 db max. - ref. 1 Khz.) • Insulated flexible leads 8" min. • All units (except the 1650G) include 40% screen taps for Ultra-Linear operation (if desired). • Typical applications - Push-Pull: triode, Ultra-Linear pentode, and tetrode connected audio output. The 1650G does NOT have primary screen taps and will not support "Ultra-Linear" applications. Part Number 1608A 1609A 1615A 1650E 1620A 1650FA 1645A 1650G 1650HA 1650KA 1650NA 1650PA 1650RA 1650TA 1650WA Audio Watts (RMS) 10 10 15 15 20 25 30 35 40 50 60 60 100 120 280 Primary Max. DC Impedance Per Side 8,000 C.T. 10,000 C.T. 5,000 C.T. 8,000 C.T. 6,600 C.T. 7,600 C.T. 5,000 C.T. 6,600 C.T. 6,600 C.T. 3,400 C.T. 4,300 C.T. 6,600 C.T. 5,000 C.T. 1,900 C.T. 1,900 C.T. 100 ma. 100 ma. 100 ma. 100 ma. 158 ma. 128 ma. 128 ma. 200 ma. 200 ma. 318 ma. 318 ma. 200 ma. 318 ma. 403 ma. 806 ma. Dimensions (Inches) Secondary Impedance A B C D E +/- 1/16” G Slot 4-8-16 4-8-16 4-8-16 4-8-16 4-8-16 4-8-16 4-8-16-70 V 3.5/8/16/250/500 4-8-16 4-8-16 4-8-16 4-8-16 4-8-16 4-8-16 4-8-16 2.50 2.50 2.50 2.50 2.50 2.50 2.50 3.13 3.13 3.13 3.13 3.13 3.75 3.75 4.38 2.75 2.75 3.25 3.25 3.50 3.50 3.75 3.75 4.00 4.00 4.25 4.25 4.25 4.50 7.50 3.06 3.06 3.06 3.06 3.06 3.06 3.06 3.81 3.81 3.81 3.81 3.81 4.56 4.56 5.25 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.50 2.50 2.50 2.50 2.50 3.00 3.00 3.50 1.69 1.69 2.19 2.50 2.44 2.44 2.69 2.25 2.69 2.69 2.94 2.94 3.06 3.31 5.88 .203 x .38 .203 x .38 .203 x .38 .203 x .38 .203 x .38 .203 x .38 .203 x .38 .203 x .38 .203 x .38 .203 x .38 .203 x .38 .203 x .38 .203 x .38 .203 x .38 .203 x .38 CANADA © 2.5 2.5 3.25 3.5 3.5 4 4.5 5 6.5 7 8 8 12 14 28 EUROPE Guelph, Ontario (519) 822-2960 St. Laurent, Quebec (514) 343-9010 www.hammondmfg.com Cheektowaga, NY (716) 630-7030 92 USA Wt. Lbs. Basingstoke, UK 01256 812812 AUSTRALIA Queenstown, Australia 61-8-8240-2244 Push - Pull Audiophile - Output (1608-1650 "A" Series) Suggested Tube Types Part Number 1608A 1609A 1615A 1650E 1620A 1650FA 1645A 1650G 1650HA 1650KA 1650NA 1650PA 1650RA 1650TA 1650WA Audio Watts (RMS) 10 10 15 15 20 25 30 35 40 50 60 60 100 120 280 Primary Impedance 8,000 C.T. 10,000 C.T. 5,000 C.T. 8,000 C.T. 6,600 C.T. 7,600 C.T. 5,000 C.T. 6,600 C.T. 6,600 C.T. 3,400 C.T. 4,300 C.T. 6,600 C.T. 5,000 C.T. 1,900 C.T. 1,900 C.T. Operation Tube Types Push-Pull (2 Tubes) Push-Pull (2 Tubes) Push-Pull (2 Tubes) Push-Pull (2 Tubes) Push-Pull (2 Tubes) Push-Pull (2 Tubes) Push-Pull (2 Tubes) Push-Pull (2 Tubes) Push-Pull (2 Tubes) Push-Pull Par. (4 Tubes) Push-Pull Par. (2 or 4 Tubes) Push-Pull (2 Tubes) Push-Pull Par. (2 or 4 Tubes) Push-Pull Par. (4 or 6 Tubes) Push-Pull Par. (6 or 8 Tubes) 6AQ5, 6V6, 6BQ5, EL84, SV83 6AQ5, 6V6, 6BQ5, EL84, SV83 2A3, 6A3, 6AQ5, 6B4G, 6L6, 6V6 6AQ5, 6V6, 6BQ5, EL84, SV83 6AQ5, 6L6, 6V6 6L6GC, 6V6, 807, 5881, EL34 6L6GC, 6V6, 807, 5881, EL34 6L6GC, 807, 5881, EL34 6L6GC, 807, 5881, EL34 6L6GC, 807, 5881, EL34, 6146B, 6550B 6L6GC, 807, 5881, EL34, 6146B, 6550B, KT88 6L6GC, 807, 5881, EL34, 6146B, 6550B, KT88 807, 5881, EL34, 6146B, 6550B, KT88 6L6GC, 5881, EL34, 6550B, KT88 6L6GC, 5881, EL34, 6550B, KT88 Note: The above examples of possible combinations are to help you narrow down the choices of transformers for your favorite tube types. How you operate the tubes (push-pull, push-pull parallel, ultra-linear, class, B+, bias, operating points, etc.) will change optimum plate to plate load impedance. Only a few of the most popular tubes are shown. As more tubes become available we will add them to the list. A tube manual or tube manufacturer's technical data sheets should be consulted first, before making a decision on a proper output transformer. Schematic All Parts Except 1645A, 1650E & 1650G Blu (Plate) White (16 Ohm) Blu/Yel (Screen Gr) Blu/Yel (Screen Gr) Yel (8 Ohm) Red B+ White (16 Ohm) Red B+ Grn (4 Ohm) Brn/Yel (Screen Gr) Brn (Plate) Black (0 Ohm) PRI Schematic - 1650E Only Red/Yel (500 Ohm) Blu (Plate) Blk/Yel (250 Ohm) Yel (16 Ohm) Blk/Grn (8 Ohm) Red B+ Red B+ Brn (Plate) Grn (8 Ohm) Org (3.5 Ohm) Blk/Red (4 Ohm) Brn/Yel (Screen Gr) Brn (Plate) Black (0 Ohm) Blk (0 Ohm) PRI PRI SEC EUROPE Basingstoke, UK 01256 812812 AUSTRALIA Queenstown, Australia 61-8-8240-2244 SEC Schematic - 1650G Only Green (16 Ohm) Blu/Yel (Screen Gr) Grn (4 Ohm) Brn (Plate) SEC Blu (Plate) Yel (8 Ohm) Brn/Yel (Screen Gr) Blk (0 Ohm) PRI Org (70 V) Tube Audio Blu (Plate) Schematic 1645A Only SEC CANADA www.hammondmfg.com Guelph, Ontario (519) 822-2960 St. Laurent, Quebec (514) 343-9010 93 Cheektowaga, NY (716) 630-7030 USA ©