Трансформатор LUNDAHL LL1660. 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
LL1660
LL1660 is an interstage / line output transformer for tube amplifiers. The transformer is available with different
core air gap 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 LL1660PP is assembled with a small core air gap to allow for some DC current unbalance.
For the S.E. versions of the LL1660, the core air gap is chosen such that the denoted DC current (18mA for a
LL1660/18mA) 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    1+1+1+1 : 2.25+2.25       315 W              240 W              625  W
Max. current through any single section:                               50 mA
Isolation between primary and secondary windings / between windings and core:  4 kV / 2 kV
Type                     LL1660 PP      LL1660 PP      LL1660/18mA     LL1660/10mA
Connection                Alt M??          Alt N           Alt Q           Alt S
PP to PP Interst.    PP Line output   SE Line Output   SE to SE Interst.
2.25+2.25 : 2+2   2.25+2.25 : 1     4.5 : 1        4 : 4.5
Primary DC current for       -               -            16 mA           10 mA
0.9 Tesla
Primary Inductance         290H            290H            100H            130H
Freq. Response (+/-1dB)   20 Hz – 25 kHz    16 Hz – 30 kHz    11 Hz – 35 kHz   25Hz - 40 kHz
@ source impedance (*)      15kW            15kW           3 kW           14 kW
Secondaries open
Max output             2 x 260V r.m.s.   130V r.m.s.     57 V r.m.s.    250 V r.m.s.
voltage @ 30 Hz
Type                   LL1660/10mA     LL1660/10mA             (*) 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
2 : 4.5       2.25 : 2 + 2          be compromised.
Primary DC current for     20 mA           18 mA               At lower source impedance resonance
0.9 Tesla                                                      peaking will occure. It can be
Primary Inductance          33H             42H                reduced using secondary load
Freq. Response (+/-1dB)   25 Hz - 30 kHz   25 Hz - 30 kHz      resistors.
@ source impedance (*)     3.5kW           3.5kW
Secondaries open
Max output              250 V r.m.s.     220 V r.m.s.
voltage @ 30 Hz                                                             R030211

LUNDAHL
TRANSFORMERS
Tube Amplifier Interstage Transformer / Line Output Transformer
LL1660
Connection Alternatives
V+                                                   V+
21              10                                   21              10
9                                                    9
8          To grid                                   8
18               7
18               7
16               5                                   16               5
4                                                    4
3          To grid                                   3
13               2                                   13               2
Alt. M?? (new!)                                           Alt. N
2.25+2.25 : 2+2                                       2.25+2.25 : 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
4.5 : 1                                      Alt. S
Single End to Line Output                              4 : 4.5
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  (new!)
2 : 4.5                                        2.25 : 2 + 2
Single End to Single End Interstage               Single End to Push Pull Interstage
Phase Indicator
Alt. M?? and Alt. V have been introduced to improve balance in PP applications
R030211