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10/3/22, 1:35 AM Tube Output (10 - 280 Watts) (1608-1650 Series) - Hammond Mfg. Quality Products. Service Excellence. Tube Output (10 - 280 Watts) 1608-1650 Series Push-Pull - HI-FI Features Please see our NEW & improved versions (easy wire secondary series). 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. Insulated flexible leads 8" min. Manufactured with plastic coil forms for coil support and insulation. Typical applications - Push-Pull: triode, Ultra-Linear pentode, pentode and tetrode connected audio output. Due to the unique interleaving of the windings BOTH secondary windings must be engaged to meet specifications (see hook-up diagrams below). For the "ultimate" in Push-Pull output see our line of epoxy potted output transformers. 1645 Only Secondary Connections (Due to the unique interleaving of the windings BOTH secondary windings must be engaged to meet specifications) To hook up 4/8/16 ohm secondary loads - see schematic (do not use the white wire). To hook up secondary to 70V loads, jumper Blk/Yel wire to Grn wire. Connect load to Blk and White wires. Gallery   Part No. Audio Primary Watts (RMS)   Maximum Secondary Impedance DC Impedance (Ohms) Per Side (Ohms)   Dimensions A https://www.hammfg.com/electronics/transformers/classic/1608-1650 B C D E G Weight +/- 1/16" Slot (lbs.) 1/2 10/3/22, 1:35 AM Part No. Tube Output (10 - 280 Watts) (1608-1650 Series) - Hammond Mfg. Audio Primary Maximum Secondary Watts Impedance DC Impedance Dimensions E G Weight (RMS) (Ohms) Per Side (Ohms) A B C D +/- 1/16" Slot (lbs.) 1608 10 8,000 ct 100 ma. 4-8-16 2.50 2.75 3.06 2.00 1.69 0.20 x 0.38 1609 10 10,000 ct 100 ma. 4-8-16 2.50 2.75 3.06 2.00 1.69 0.20 x 0.38 2.5 2.5 1615 15 5,000 ct 100 ma. 4-8-16 2.50 3.25 3.06 2.00 2.19 0.20 x 0.38 3.25 1620 20 6,600 ct 158 ma. 4-8-16 2.50 3.50 3.06 2.00 2.44 0.20 x 0.38 3.5 1650F 25 7,600 ct 128 ma. 4-8-16 2.50 3.50 3.06 2.00 2.44 0.20 x 0.38 4 1645 30 5,000 ct 128 ma. 4-8-16-70V 2.50 3.75 3.06 2.00 2.69 0.20 x 0.38 4.5 1650H 40 6,600 ct 200 ma. 4-8-16 3.13 4.00 3.81 2.50 2.69 0.20 x 0.38 6.5 1650K 50 3,400 ct 318 ma. 4-8-16 3.13 4.00 3.81 2.50 2.69 0.20 x 0.38 7 1650M 60 1,400CT/800CT 318 ma. 4-8-16 3.13 4.19 3.80 2.50 2.94 0.20 x 0.38` 7.5 1650N 60 4,300 ct 318 ma. 4-8-16 3.13 4.25 3.81 2.50 2.94 0.20 x 0.38 8 1650P 60 6,600 ct 200 ma. 4-8-16 3.13 4.25 3.81 2.50 2.94 0.20 x 0.38 8 1650R 100 5,000 ct 318 ma. 4-8-16 3.75 4.25 4.56 3.00 3.06 0.20 x 0.38 12 1650T 120 1,900 ct 403 ma. 4-8-16 3.75 4.50 4.56 3.00 3.31 0.20 x 0.38 14 1650W 280 1,900 ct 806 ma. 4-8-16 4.38 7.50 5.25 3.50 5.88 0.20 x 0.38 28 Suggested Tube Types Part No. Audio Primary Watts Impedance (R.M.S.) (Ohms) Operation Suggested Tube Types 1608 10 8,000 ct Push-Pull (2 Tubes) 6AQ5, 6V6, 6BQ5, EL84, SV83 1609 10 10,000 ct Push-Pull (2 Tubes) 6AQ5, 6V6, 6BQ5, EL84, SV83 1615 15 5,000 ct Push-Pull (2 Tubes) 2A3, 6A3, 6AQ5, 6B4G, 6L6, 6V6 1620 20 6,600 ct Push-Pull (2 Tubes) 6AQ5, 6L6, 6V6 1650F 25 7,600 ct Push-Pull (2 Tubes) 6L6GC, 6V6, 807, 5881, EL34 1645 30 5,000 ct Push-Pull (2 Tubes) 6L6GC, 6V6, 807, 5881, EL34 1650H 40 6,600 ct Push-Pull (2 Tubes) 6L6GC, 807, 5881, EL34 1650K 50 3,400 ct Push-Pull Par. (4 Tubes) 6L6GC, 807, 5881, EL34, 6146B, 6550B 1650N 60 4,300 ct Push-Pull Par. (2 or 4 Tubes) 6L6GC, 807, 5881, EL34, 6146B, 6550B, KT88 1650P 60 6,600 ct Push-Pull (2 Tubes) 6L6GC, 807, 5881, EL34, 6146B, 6550B, KT88 1650R 100 5,000 ct Push-Pull Par. (2 or 4 Tubes) 807, 5881, EL34, 6146B, 6550B, KT88 1650T 120 1,900 ct Push-Pull Par. (4 or 6 Tubes) 6L6GC, 5881, EL34, 6550B, KT88 1650W 280 1,900 ct Push-Pull Par. (6 or 8 Tubes) 6L6GC, 5881, EL34, 6550B, KT88 Notes: 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. Data subject to change without notice © 2022. Hammond Manufacturing Ltd. All rights reserved. https://www.hammfg.com/electronics/transformers/classic/1608-1650 2/2