Microphone Transformers


Type Turns Ratio Size LxWxH Max Primlevel Applications / Comments
LL1527 1+1 : 1+1 38x24x17 +16 dBU The "standard" problem solver. Ground isolation, MS decoding, splitting 1 direct + 1 isolated outputs. Mic input 200:800 ohms.
LL1528 1+1 : 2.5+2.5 38x24x17 +10 dBU 200 : 5 k ohms
LL1530 1+1 : 3.5+3.5 38x24x17 +10 dBU 200 : 10 k ohms. Also used in DI-boxes 10k : 200 ohms
LL1538 1+1 : 5 38x24x17 +10 dBU 200 : 5 k ohms. Probably the best 1:5 microphone input transformer available.
LL1538XL 1+1 : 5 38x24x20.5 +13 dBU 200 : 5 k ohms. High level version of LL1538
LL1550 1+1+1+1 : 4+4 30x22.5x14.5 +2 dBU 200 : 3.2 k ohms if used 1:4. Many other connections possible.
LL1570 1+1 : 1+1 38x24x17 +10 dBU 200 : 200 ohms or 200 : 800 ohms For low impedance input mic preamps such as Jensen JE-990
LL1571 1+1 : 1.75 + 1.75 38x24x17 +10 dBU 200 : 2.5 k ohms.
LL1576 1+1 : 7 38x24x17 +10 dBU 200 : 10 k ohms. Same pinout as LL1538
LL1577 1+1 : 14 38x24x17 +10 dBU 50 : 10 k ohms. Same pinout as LL1538. For low impedance source.
LL1578 1+1 : 10 38x24x17 +10 dBU 50 : 5 k ohms. Same pinout as LL1538. For low impedance source.
LL1578XL 1+1 : 10 38x24x20.5 +13 dBU 50 : 5 k ohms. Same pinout as LL1538. For low impedance source.
LL1587 1+1 : 4 26x17x12 +2 dBU 200 : 3.2 k ohms. Small size.
LL1636 1+1+1+1 : 10+10 30x22.5x14.5 -14 dBU Mic Input. DI-box. Moving coil input.
LL1935 1+1 : 5+5 38x23x16 +7 dBU DI (Direct Input) used 10:1. Mic input 200 : 20k.
LL1936 (2+1) + (2+1) : 4 + 4 48x29x20 +14 dBU Can be connected for 75, 150, 300 and 600 ohm microphones into 1200 ohms
LL7903 1+1+1+1 : 2+2+2+2 66x32x21 +16 dBU 200 : 13 k ohms (used 1:8) This is the ultimate microphone input transformer, designed for high quality tube equipment.
LL7905 1+1+1+1 : 5.6 + 5.6 66x32x21 +16 dBU High level 600 ohms tube amplifier mic/line input (used 2 : 11.2) Designed for high quality tube equipment.

Special Application Microphone Transformers


These are normally used as microphone output transformers.

Type Turns Ratio Size LxWxH Application Comments
LL1927A 1+1 : 55+55 30x22.5x14.5 Ribbon microphones (used 1:110) Ribbon microphones (used 1:110). Amorphous core. Normally requires active output stage.
LL1940 9 : 1+1 31 x 25 x 16 NEW! Tube microphones Silicon-iron C-core, which results in a transformer with more "transformer sound character", compared to a classic mu metal lamination transformer. PCB mount style.
LL2912 1 : 37 27 mm x diam. 18.5 Ribbon microphones Amorphous core. Flying leads. No housing
LL2913 1+1+1+1: 37 30x22.5x14.5 Ribbon microphones Amorphous core. PCB version of LL2912. With mu metal housing.
LL2914 1+1+1+1: 37 38x24x17 Ribbon microphones Mu metal core version of LL2913.
LL2915 1 : 37 36 mm x diam. 22 Ribbon microphones Mu metal lamination core. Flying leads. No housing