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Tube amplifier output transformer LL1663

5k : 8 ohms

The LL1663 is a four-sectioned dual coil C-core tube amplifier output transformer for 5 k: 8 ohms impedance

ratio available in PP and SE versions.

The coil is wound using our high internal isolation technique with isolation foil between each copper layer. The

core is an audio C-core of our own production.

Turns ratio 12+12 : 1 or (4+8)+(4+8) : 1

Winding schematics, physical dimensions, pin and mounting hole layout (all dimensions in mm)

Weight: 1.35 kg

Static resistance of each primary: 102Ω

Static resistance of secondary: 0.4 Ω

Isolation between windings / between windings and core: 4 kV / 2 kV

Max DC current through any primary winding: 160mA

LL1663/PP LL1663/50mA LL1663/100mA

Primary inductance (approx.) 35H 17H

Max primary signal 450V R.M.S. @ 30 Hz 200V R.M.S. @ 30 Hz 200V R.M.S. @ 30 Hz

Max output power @ 30 Hz 40W (8Ω spkr) 8W (8Ω spkr) 8W (8Ω spkr)

Suggested use:

Bottom view

4 x M4

Mounting holes

95

35

75

75 50

R030404

LUNDAHL TRANSFORMERS

Tibeliusgatan 7 International DomesticS-761 50 NORRTÄLJE Phone +46 - 176 13930 0176-13930SWEDEN Fax +46 - 176 13935 0176-13935

17

3 5 7 9 11

13

1

3

5

1

7

9

8

4

11

13

17

1

4

8

LL1663 used in Single End

Primary impedance 5k at 8

ohms load

17

3

5

7

9

131

11

V+

Plate

LL1663 used in Push Pull

Plate-to-plate impedance

5k at 8 ohms load

V+

Plate 1

Plate 2

3

5

7

9

131

11

17

UL1 33%

UL2 33%