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Lundahl Line input transformer, LL7901

LL7901

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Lundahl Line input transformer, LL7901

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161,36 €

132,26 € tax excl.***

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Line Input / General Purpose Transformers LL7901 and LL7902

LL7901 and LL7902 are large size, high level, high performance audio transformers, made for extraordinary requirements. The LL7901 has an extreme level capability ( + 34 dBU @ 50 Hz) while the LL7902 combines high level capability (+28 dBU @ 50 Hz) with low copper resistance.

The transformer consists of two coils each with two primary and two secondary windings separated by electrostatic shields. The core is a high permeability mu metal lamination core. The transformers are magnetically shielded by a mu metal case.

Turns ratio: 1 + 1 + 1 + 1 : 1 + 1 + 1 + 1
Dims (Length x Width x Height above PCB (mm)): 66 x 32 x 21

Spacing between pins: 5.08 mm (0.2")
Spacing between rows of pins: 5.08 / 45.72 mm (0.2 / 1.8")
Weight: 155 g
Rec. PCB hole diameter: 1.5 mm

LL7901

LL7902

Static resistance of each primary (average):

120 ?

28 ?

Static resistance of each secondary (average):

125

28 ?

Distortion (primaries connected in series, source impedance 600 ? ):

+ 20 dBU primary level,
50 Hz: 0.1 %

+ 10 dBU primary level,
50 Hz: 0.1 %

+ 34 dBU primary level, 50 Hz: 1 %

+ 28 dBU primary level, 50 Hz: 1 %

Self resonance point :

> 80 kHz

> 150 kHz

Optimum termination for best squarewave response (source imp. 600 ?) :

12 kW in series with 1.7 nF

5 kW in series with 1.3 nF

Frequency response (source and load as above)

10 Hz - 55 kHz +/- 0.5 dB

10 Hz - 100 kHz +/- 0.5 dB

Isolation between primary and secondary windings/ between windings and shield: 4 kV / 2 kV

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Lundahl Line input transformer, LL7901

Lundahl Line input transformer, LL7901

Lundahl Line input transformer, LL7901