1640SEA

10/3/22, 1:35 AM Tube Output (25 - 75 Watts) Single Ended - HI-FI (1627-1642 Series) - Hammond Mfg. Quality Products. Service Excellence. Tube Output (25 - 75 Watts) Single Ended - HI-FI 1627-1642 Series Features "Over designed" for high fidelity, single ended, Class-A, tube output circuits (triode, tetrode or pentode tubes). Enclosed (shielded), four slot, chassis Type "X" mounting. Frequency response at least 20 Hz. to 20 Khz. at full rated power (+/- 1 db max., ref. 1 Khz.) Insulated flexible leads 8" min. For maximum versatility, all units (except the 1642SE & 1638SEA) include a 40% screen tap for Ultra-Linear, tetrode/pentode operation (if desired). The 1642SE & 1638SEA do NOT include this screen tap as they were designed principally for high impedance triode tubes. High quality laminations, (M6) grain oriented silicon steel. Core is gapped to reduce core saturation in Class-A tube amplifier circuits. For general purpose or replacement use in single ended tube output circuits see our 125SE Series.   Audio Impedance Primary Ultra-Linear Secondary Hipot Max. DC 40% Primary Impedance Test Weight Mounting Overall Dimensions Part No. Watts (Ohms) Bias Inductance Tap (Ohms) (VRMS) (lbs.) 1626SEA 25 600 250 ma. 2.9 Henrys Yes 4-8-16 2000 11 3.75 4.44 4.56 3.00 3.31 0.20 x 0.38 1640SEA 30 1250 200 ma. 14 Henrys Yes 4-8-16 2000 11 3.75 4.94 4.56 3.00 3.81 0.20 x 0.38 1627SEA 30 2500 160 ma. 20 Henrys Yes 4-8-16 2000 11 3.75 4.94 4.56 3.00 3.81 0.20 x 0.38 https://www.hammfg.com/electronics/transformers/audio/1627-1642 A B C D Slot E G 1/2 10/3/22, 1:35 AM Tube Output (25 - 75 Watts) Single Ended - HI-FI (1627-1642 Series) - Hammond Mfg. Primary Ultra-Linear Secondary Hipot Audio Impedance Max. DC 40% Primary Impedance Test Weight Mounting Part No. Watts (Ohms) Bias Inductance Tap (Ohms) (VRMS) (lbs.) 1630SEA 30 3500 135 ma. 15 Henrys Yes 4-8-16 2000 11 3.75 4.94 4.56 3.00 3.81 0.20 x 0.38 1628SEA 30 5000 120 ma. 48 Henrys Yes 4-8-16 2000 11 3.75 4.94 4.56 3.00 3.81 0.20 x 0.38 1642SE 75 5000 300 ma. 53 Henrys No 4-8-16 3500 28 4.38 7.50 5.25 3.50 5.88 0.20 x 0.38 1629SEA 30 6500 100 ma. 55 Henrys Yes 4-8-16 2000 11 3.75 4.94 4.56 3.00 3.81 0.20 x 0.38 1638SEA 30 10000 90 ma. 88 Henrys No 4-8-16 2000 11 3.75 4.94 4.56 3.00 3.81 0.20 x 0.38 Overall Dimensions A B C D Slot E G RED wire connects to B+ BLUE/YELLOW wire connects to screen (optional use) BLUE wire connects to the tube plate The 1642SE & 1638SEA do not include a primary screen tap (as they are designed for triode applications). Suggested Tube Types: Part No. Triodes Pentodes 1626SEA 6C33 - 1640SEA Parallel - 2A3, 6A3, 6B4G, 300B, 572B, 811A Parallel - 6550, 6CA7 1627SEA 2A3, 6A3, 6B4G, 300B 6CA7, 6L6, 807, 5881, 6550, Parallel - 6AQ5, 6V6, EL84 1630SEA 2A3, 6A3, 6B4G, 300B 6CA7, 6L6, 807, 5881, 6550, Parallel - 6AQ5, 6V6, EL84 1628SEA 211, 300B, 572B, 811A 6AQ5, 6V6, 6L6, 807, 5881, 6550, EL84 Parallel - 211, 572, 811A, 845 - 1629SEA 211, 811A, 572B, 845 6AQ5, 6V6, 6L6, 807, 5881, 6550, EL84 1638SEA 211, 845 - 1642SE 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 (ultra-linear, bias, plate voltage, operating points, etc.) will change optimum plate load impedance. Only a few of the most popular tubes are shown. 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/audio/1627-1642 2/2