Type Turns Ratio Size (LxWxH mm) Max Prim. Level.
1% dist, 50Hz (Prim. in series)		 Comments
PDF
LL1531 1+1 : 2 28x17x15 20 dBU  
lundahl, Line input Transformers, LL1531
LL1540 1+1 : 1+1 38x24x17 30 dBU High level input
lundahl, Line input Transformers, LL1540
LL1544A 1+1+1+1 : 2+2 30x22.5x14.5 20 dBU Amorphous strip core. General purpose with many connection alternatives.
Replaces LL1544 and LL1554
lundahl, Line input Transformers, LL1544A
LL1545A 1+1+1+1 : 2+2 38x24x17 22 dBU General purpose with many connection alternatives. Replaces LL1545
lundahl, Line input Transformers, LL1545A
LL1554 1+1+1+1 : 2+2 30x22.5x14.5 - Replaced by LL1544A
lundahl, Line input Transformers, LL1554
LL7101 1+1 : 1.4 28x18x10 N/A (Very high!) For Zero Field input circuitry
lundahl, Line input Transformers, LL7101
LL6404 1 : 1 15.5x11x10 N/A Very small size.
For Zero Field input circuitry
lundahl, Line input Transformers, LL16404
LL7901 1+1+1+1 : 1+1+1+1 66x32x21 34 dBU Very high level, high impedance input.
lundahl, Line input Transformers, LL7901
LL7902 1+1+1+1 : 1+1+1+1 66x32x21 28 dBU General purpose. Very high quality line input for step-down or step-up lundahl, Line input Transformers, LL7902
LL1922 1+1 : 4+4 47x28x24 26 dBU High level stepup line input. Similar to the UTC LS-10. lundahl, Line input Transformers, LL1922
General properties:
• PCB mount style
• High level capability
• Excellent magnetic and electrostatic shielding
• High mu cores (mu metal or amorphous strip core)