86 europe basingstoke, uk 01256 812812 australia queenstown, australia 61-8-8240-2244 canada guelph, ontario (519) 822-2960 st. laurent, quebec (514) 343-9010 usa cheektowaga, ny (716) 630-7030 ? www.hammondmfg.com single ended audiophile - tube output (1627-1642 series) single-ended "classic" tube output - ultra-linear "over designed" for high-fdelity, 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.) ? units are designed to provide ample "headroom" at bass frequencies (note the weight of each transformer). ? all models have a secondary tapped for 4, 8 or 16 ohm outputs. ? insulated fexible 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 a 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 amplifer circuits. ? for general purpose or replacement use in single ended, tube output circuits see our 125 "se" series. ? part number audio watts primary ultra-linear 40% primary tap hipot test (vrms) dimensions (inches) wt. lbs. impedance max. dc bias inductance henrys a b c d e g slot 1640sea 30 1,250 200 ma. 14 yes 2,000 3.75 4.95 4.56 3.00 3.90 .203 x .375 11 1627SEA 30 2,500 160 ma. 20 yes 2,000 3.75 4.50 4.56 3.00 3.13 .203 x .375 11 1630sea 30 3,500 135 ma. 42 yes 2,000 3.75 4.98 4.65 3.00 3.90 .203 x .375 11 1628sea 30 5,000 120 ma. 48 yes 2,000 3.75 4.50 4.56 3.00 3.13 .203 x .375 11 1642se 75 5,000 300 ma. 53 no 3,500 4.38 7.50 5.25 3.50 5.88 .203 x .375 28 1629sea 30 6,500 100 ma. 55 yes 2,000 3.75 4.50 4.56 3.00 3.88 .203 x .375 11 1638sea 30 10,000 90 ma. 88 no 2,000 3.75 4.50 4.56 3.00 3.13 .203 x .375 11 tu be audio
87 europe basingstoke, uk 01256 812812 australia queenstown, australia 61-8-8240-2244 canada guelph, ontario (519) 822-2960 st. laurent, quebec (514) 343-9010 usa cheektowaga, ny (716) 630-7030 ? www.hammondmfg.com suggested tube types part no. triodes pentodes 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 1642se parallel - 211, 572, 811a, 845 - 1629sea 211, 811a, 572b, 845 6aq5, 6v6, 6l6, 807, 5881, 6550, el84 1638sea 211, 845 - 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 (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 frst, before mak - ing a decision on a proper output transformer. bl ue (p la te ) re d (b +) bl a ck (0 ) gr een (4 ) wh it e ( 16) pr i sec bl ue/ ye ll (s cr een) ye llo w (8 ) transformer schematic single ended audiophile - tube output (1627-1642 series) tu be audio notes: - the 1642se and 1638sea do not include a primary screen tap (as they are designed for triode applications). - red wire connects to b+ - blue/yell wire connects to screen (optional use) - blue wire connects to tube plate
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