Трансформатор LUNDAHL LL1679. 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 Output Transformers
LL1679
LL1679 is an output transformer for tube amplifiers, available with different core air-gaps for different types of output
stages.  The transformers are highly sectioned with harmonically sized sections, which results in a minimum leakage
inductance. This combined with a low capacitance coil winding technique results in a wide frequency range.
The primary winding can be tapped for 36% UL connection.
The transformers have a special audio C-core of our own production.
The transformers are unpotted, open frame type suitable for mounting inside an amplifier housing.
Physical dimensions, pin and mounting hole layout LL1679 (all dimensions in mm)
Primary connections                  53                          Secondary connections
12          19                                                      41         34
4 x M4
Mounting holes
I        II             90                           110           II          I
Bottom view
1   3  4   8    10 11                                              52   50 49   45   43 42
78                             85
R031029
Pin spacing module:          5.08 mm  (0.2")
Row spacing:                 76mm approx.
Weight:                      2.5 kg
Turns ratio:                 22 + 12.5 + 22 + 12.5 : 2 + 1 + 2 + 1
Winding schematics:
Coil I                Coil II
3    12  4    1         8   11   19  10
22      12.5           12.5     22
1        2
2       1
43  34   42  45         52  49   41  50
LL1679
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LL1679
Turns ratio:                              22 + 12.5 + 22 + 12.5 : 2 + 1 + 2 + 1
Static resistance of primary (all in         160 W (2 x 54W + 2 x 26W )
series)
Static resistance of inner/outer                    0.5W / 0.3W
secondary winding
Primary leakage inductance (all in                     8 mH
series)
Max. primary signal voltage r.m.s.   Push-Pull                Single End
at 30 Hz  (all in series)             670V                      295V
Isolation between primary and secondary windings / between windings and core:  3 kV / 1.5 kV
Electrical characteristics
Primary Load Impedance, Max power and power loss.
Sec. connection for 4/8/16 W
(See next page)
-/B/C           B/C/D          C/D/E
Primary Load Impedance
(transformer copper resistance included)
LL1679                9.7 kW           4.5 kW         2.6 kW
Power and Loss
Max. Power, P-P at 30 Hz       45W             105W           188W
Max. Power, S.E. at 30 Hz       9W              20W            36W
Power loss across          0.2 dB          0.4 dB         0.6 dB
transformer
Primary DC Current    Core Air-gap  and   Primary inductance
LL1679/PP        LL1679/70mA
Core Airgap                     25 µ              190 µ
(delta/2)
Single end standing current for 0.9 Tesla                     70mA
(recommended operating point)
Primary inductance                 150 H              40H
Frequency response, LL1679/PP                     10 Hz – 70 kHz +0/-3 dB
(source impedance 2k, load impedance 10 ohms
primary winding is series, secondary winding alt. C)
LL1679
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Primary connections, Push-Pull
Primary connections, Single End
V +       1           12         Tube Anode                              1            12
Tube screen grid 37%
3                                                              3
4                                            Tube Anode        4
8           19         Tube Anode                              8            19
10                     Tube screen grid 37%                    10
11                                                             11
V +
Secondary connections
Indicates phase
42                                              42
43
43
34        45                                   34         45
49                                              49
B      50                                       C      50
41        52                                   41         52
Max secondary Voltage  RMS @ 30 Hz               Max secondary Voltage  RMS @ 30 Hz
P-P: 19V           SE : 8.5V                    P-P: 29V            SE : 13V
Sec. copper resistance   Windings in series      Sec. copper resistance   Windings in series
0.2 W                 2                         0.4 W                 3
42                                                 42
43
43
34        45                                      34         45
49                                                 49
D     50                                        E        50
41        52                                      41         52
Max secondary Voltage  RMS @ 30 Hz               Max secondary Voltage  RMS @ 30 Hz
P-P: 39V           SE : 17V                     P-P: 58V            SE : 25V
Sec. copper resistance   Windings in series      Sec. copper resistance   Windings in series
0.7 W                 4                         1.6 W                 6
LL1679
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