Трансформатор LUNDAHL LL1671 30 mA. 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
High Current Tube Amplifier Interstage / Line Output Transformer
LL1671
LL1671 is a high current interstage / line output transformer for tube amplifiers. The transformer is available
with various core air gaps optimised for PP or SE drives.
The transformer is 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 LL1671PP is assembled with a small core air gap to allow for some DC current unbalance.
For the S.E. versions of the LL1671, the core air gap is chosen such that the denoted DC current (30mA for a
LL1671/30mA) 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       1+1+1+1 : 2+2          88 W                69 W              156  W
Max. current through any single section:                               100 mA
Isolation between primary and secondary windings / between windings and core:  4 kV / 2 kV
Type                     LL1671 PP      LL1671 PP      LL1671/30mA     LL1671/30mA
Connection                Alt M??          Alt N           Alt Q           Alt S
PP to PP Interst.    PP Line output   SE Line Output   SE to SE Interst.
2+2 : 2+2        2+2 : 1          4 : 1           1 : 1
Primary DC current for       -               -            30 mA           30 mA
0.9 Tesla
Primary Inductance         80 H            80 H            35 H            35 H
Freq. Response (+/-1dB)   20 Hz – 25 kHz    15 Hz – 50 kHz             30Hz - 30 kHz
@ source impedance (*)      5kW             5kW                            3 kW
Secondaries open
Max output             2 x 150V r.m.s.   75V r.m.s.      33 V r.m.s.    130 V r.m.s.
voltage @ 30 Hz
Type                   LL1671/30mA     LL1671/30mA             (*) The source impedances used in
Connection                 Alt T           Alt V               the tables indicates a recommended
SE to SE Interst.   SE to PP Interst.   upper limit, unless freq. response can
1 : 2         1 : 1 + 1            be compromised.
Primary DC current for     60 mA           60 mA               At lower source impedance resonance
0.9 Tesla                                                      peaking will occur. It can be reduced
Primary Inductance         10 H             10 H               using secondary load resistors.
Freq. Response (+/-1dB)   40 Hz - 25 kHz   40 Hz - 25 kHz
@ source impedance (*)     1 kW             1 kW
Secondaries open
Max output              130 V r.m.s.     130 V r.m.s.
voltage @ 30 Hz                                                             R030304

LUNDAHL
TRANSFORMERS
Tube Amplifier Interstage Transformer / Line Output Transformer
LL1671
Connection Alternatives
V+
V+
21              10
9                               21              10
8          To grid                               9
18               7                                                8
18               7
16               5
4                               16               6
3          To grid                               5
13               2                                                4
13               3
Alt. M?? (new!)                                           Alt. N
2+2 : 2+2                                              2+2 : 1
Push-Pull to Push-Pull Interstage                        Push-Pull to Line Output
V+                                                 V+
21              10                                   2              13
9                                   3
8                                   4
18               7
5              16
16               5                                   7              18
4                                   8
3                                   9
13               2                                  10              21
To grid
Alt. Q                                       Alt. S
4 : 1
1 : 1
Single End to Line Output                Single End to Single End Interstage
V+
V+
To grid
2              13                                21              10
3                                                                 9
4                                                                 8
5              16                                18               7
7              18                                16               5         To grid
8                                                                 4
9                                                                 3
10              21                                13               2
To grid             Alt. V (new)
Alt. T                                            1 : 1 + 1
1 : 2                               Single End to Push Pull Interstage
Single End to Single End Interstage
Phase Indicator