Трансформатор LUNDAHL LL1689. Инструкция на английском языке

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