Трансформатор LUNDAHL LL1692AM. 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
Tube Amplifier Interstage Transformer / Line Output Transformer
LL1692A
LL1692A is an interstage transformer for tube amplifiers, impedance-wise placed between LL1660 and LL1671.
LL1692A 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. It has a special high flux, low distortion audio C-core of our own production.
The Push-Pull version is assembled with a small core air gap to allow for some DC current unbalance. For the
S.E. versions of the LL1692A, the core air gap is chosen such that the denoted DC current (18mA for a
LL1692A/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 approx. 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 : 1.75+1.75       220 ?              175 ?              345  ?
Max. DC current through any single section:                            70 mA
Isolation between primary and secondary windings / between windings and core:  4 kV / 2 kV
Type                    LL1692A PP      LL1692A PP     LL1692A/18m     LL1692A/18m
A               A
Connection                 Alt  M          Alt N           Alt Q           Alt S
PP to PP Interst.   PP Line output   SE Line Output   SE to SE Interst.
1.75+1.75 : 2+2   1.75+1.75 : 1     3.5 : 1        4 : 3.5
Primary DC current for       -               -            21 mA           18 mA
0.9 Tesla
Primary Inductance         210H            210H            95H             125H
Freq. Response (+/-1dB)   20 Hz – 45 kHz   20 Hz – 50 kHz   10 Hz – 55 kHz   30Hz - 30 kHz
@ source impedance (*)      10k?            10k?           2 k?           10 k?
Secondaries open
Max output             2 x 240V r.m.s.   120V r.m.s.     50 V r.m.s.    175 V r.m.s.
voltage @ 30 Hz
Type                   LL1692A/18m     LL1692A/18mA
A
Connection                 Alt  T          Alt V
SE to SE Interst.   SE to PP Interst.   (*) The source impedances used in the
2 : 3.5       1.75 : 2 + 2       tables indicate a recommended upper
Primary DC current for     36 mA           41 mA            limit, unless the specified LF frequency
0.9 Tesla                                                   response can be compromised.
At lower source impedance, bass will
Primary Inductance          35H             24H             improve but resonance peaking might
Freq. Response (+/-1dB)   40 Hz - 30 kHz   50 Hz - 30 kHz   occur. Peaking can be reduced using
@ source impedance (*)     3 k?             3 k?            secondary load resistors or RC networks.
Secondaries open
Max output              175 V r.m.s.     190 V r.m.s.
voltage @ 30 Hz                                                             R080124

LUNDAHL
TRANSFORMERS
Tube Amplifier Interstage Transformer / Line Output Transformer
LL1692A
Connection Alternatives
V+                                                   V+
21              10
9                                   21              10
8          To grid                                   9
18               7                                                    8
18               7
16               5
4                                   16               5
3          To grid                                   4
13               2                                                    3
13               2
Alt. M                                               Alt. N
1.75 + 1.75 : 2+2                                      1.75 + 1.75 : 1
Push-Pull to Push-Pull Interstage                        Push-Pull to Line Output
V+                                                 V+
21              10                                                  13
9                                   2 3
8                                   4
18               7
5              16
16               5                                   7              18
4                                   8
3
13               2                                  10 9            21
To grid
Alt. Q
3.5 : 1                                      Alt. S
Single End to Line Output                              4 : 3.5
Single End to Single End Interstage
V+                                                    V+
2              13                                    21              10         To grid
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. T                                           Alt. V
2 : 3.5                                        1.75 : 2 + 2
Single End to Single End Interstage               Single End to Push Pull Interstage
Phase Indicator
R080124