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Руководство пользователя LUNDAHL LL1689AM. Основные функции, характеристики и условия эксплуатации изложены на 2 страницах документа в pdf формате.
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Tibeliusgatan 7 International Domestic LUNDAHL S-761 50 NORRTALJE Phone +46 - 176 13930 0176-13930 TRANSFORMERS SWEDEN Fax +46 - 176 13935 0176-13935 Line Output Transformer LL1689 LL1689 is a line output transformer for tube amplifiers. The transformer is available with different core air gap for PP or SE drives. The transformer primaries are wound with a special low capacitance winding technique to achieve best high frequency performance. The transformer has a special high flux, low distortion audio C-core of our own production. The LL1689PP is assembled with a small core air gap to allow for some DC current unbalance. For the S.E. versions of the LL1689, the core air gap is chosen such that the denoted DC current (18mA for a LL1689/18mA) generates a no signal core flux density of 0.9 Tesla when used with all primaries in series. This leaves a flux density swing of 0.7 T for the signal. Winding schematics, physical dimensions, pin and mounting hole layout (all dimensions in mm) 36 2 A 5 13 10 9 8 7 5 4 3 2 C 3 16 4 x M3 Mounting holes B 56 4 73 Bottom view 9 B 21 18 16 13 21 8 C 10 18 A 53 61 7 Weight Turns ratio Static resistance, Static resistance, Static resistance, winding A winding B winding C 0.75 Kg 9+9 : 1+1+1+1 19 W 15 W 655 W Max. current through any primary (“C”) section: 50 mA Isolation between primary and secondary windings / between windings and core: 4 kV / 2 kV Type LL1689/PP LL1689/PP LL1689/PP LL1689/18mA Connection Alt M Alt N Alt O Alt P PP to Line Out. PP to Line Out. PP to Line Out. SE to Line Out. 9+9 : 4 9+9 : 2 9+9 : 1 18 : 4 Primary DC current for 0.9 - - - 18 mA Tesla Primary Inductance 290 H 290 H 290 H 90H Freq. Response (+/-1dB) @ Hz – kHz source impedance (*) 15kW 15kW 15 kW 3 kW Secondaries open Max sec. voltage 128V r.m.s. 64V r.m.s. 32V r.m.s. 56 V r.m.s. @ 30 Hz Type LL1689/18mA LL1689/18mA (*) The source impedances used Connection Alt Q Alt R in the tables indicates a SE to Line Out. SE to Line Out. recommended upper limit, 18 : 2 18 : 1 unless freq. response can be Primary DC current for 0.9 18 mA 18 mA compromised. Tesla At lower source impedance Primary Inductance 90H 90H resonance peaking will occure. Freq. Response (+/-1dB) @ It can be reduced using source impedance (*) 3.5kW 3.5kW secondary load resistors. Secondaries open Max output 28 V r.m.s. 14 V r.m.s. voltage @ 30 Hz R040407
LUNDAHL TRANSFORMERS Tube Amplifier Interstage Transformer / Line Output Transformer LL1689 Connection Alternatives V+ V+ 21 10 21 10 9 9 8 8 18 7 18 7 16 5 16 5 4 4 3 3 13 2 13 2 Alt. M Alt. P 9+9 : 4 (CT at 5) 18 : 4 (CT at 5) Push-Pull to Line Output Single End to Line Output V+ V+ 21 10 21 10 9 9 8 8 18 7 18 7 16 5 16 5 4 4 3 3 13 2 13 2 Alt. N Alt. Q 9+9 : 2 (CT at 7+4) 18 : 2 (CT at 7 + 4) Push-Pull to Line Output Single End to Line Output V+ V+ 21 10 9 21 10 8 9 18 7 8 18 7 16 5 4 16 5 3 4 13 2 3 13 2 Alt. O 9+9 : 1 Alt. R Push-Pull to Line Output 18 : 1 Single End to Line Output Phase Indicator