Трансформатор LUNDAHL LL1674. Инструкция на английском языке

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High Level Tube Amplifier Input Transformer
LL1674
The LL1674 is a large, high signal level audio transformer built with the well know Lundahl amorphous core.
The LL1674 consists of two coils, each with a two-sectioned primary winding and a high level secondary
winding separated by electrostatic shields. The core is a two-component amorphous strip core. The very high mu
of the core results in a phase shift of less than 0.5 degree at 10Hz.
The transformer is magnetically shielded by a mu metal housing.
Turns  ratio:                                            1 + 1 : 4 + 4
Dims (Length x Width x Height above PCB (mm)):           43 x 28 x 21
Pin layout  (viewed from component side) and winding schematics:
7
5             10                 2
4               9
LL1674                       1                      6
8                                       9
4
2   (Top view)     7
1               6                5                    10
8 +can & core
Spacing between pins:                     5.08 mm  (0.2")
Spacing between rows of pins:             30.48mm  (1.2")
Weight:                                   80 g
Rec. PCB hole diameter:                   1.5 mm
Static resistance of each primary (average):                        33W
Static resistance of each secondary (average):                     605W
Distortion                                             22V rms (+29 dBU) secondary level,
(primaries connected in parallel, source impedance 150W ):       30 Hz: 1%
22V rms (+29 dBU) secondary level,
50 Hz: 0.2%
Self resonance point :                                              70 kHz
Optimum termination for best frequency response             No termination required
(source imp.  150W ) :
Frequency response                                          10Hz – 45kHz +/- 0.5dB
(source 150W  ,  load 10k)                                      -3dB @ 80kHz
Isolation between primary and secondary windings/ between       3 kV / 1.5 kV
windings and shield (rms):
Suggested usage, 1: 4+4
5              10
4               9
LL1674     8
2    (Top view)     7
1               6
Indicates phase
R011127