Tube Amplifier Output Transformers

Type

Impedance Ratio

LL1620 3.3k, 6.0k or 11.5k primary impedance. 4, 8, or 16 ohms secondary impedance
LL1623 1.6k, 3.0k or 5.6k primary impedance. 4, 8, or 16 ohms secondary impedance
LL1627 650 ohms, 1.2k or 2.3k primary impedance. 4, 8, or 16 ohms secondary impedance
LL1663 5k primary. UL tap. 8 ohm secondary impedance
LL1664 3k primary. UL tap. 8 ohm secondary impedance
LL1679 2.6k, 4.5k, 9.7k primary impedance. UL tap. 4, 8, or 16 ohms secondary impedance
LL1682 5.5k primary. 33% UL tap. 5 ohm secondary impedance
LL1688 5.5k, 9.2k, 20.5k primary. 33% UL tap. 4, 8, or 16 ohms secondary impedance
LL1691 9k primary. 8 ohms secondary impedance
LL1691B 18k primary. 8 ohms secondary impedance
LL1693 600 ohm, 1k, 2.3k primary impedance. 4, 8, or 16 ohms secondary impedance
LL2735 16k primary. 8 ohm secondary
LL9202 6.5k, 11k, or 23k primary impedance. 4, 8, or 16 ohms secondary impedance

Tube Amplifier Interstage Transformers

Type

Turns Ratio

Usage/Comment

LL1635 1+1 : 1+1 SE : SE or P-P : P-P
LL1660 1+1+1+1 : 2.25+2.25 Numerous connection alternatives
LL1660S 1+1+1+1 : 2.25+2.25 Numerous connection alternatives; Faraday shields
LL1671 1+1+1+1 : 2+2 High current version of LL 1660
LL1677 1+1+1+1 : 4+4 High current interstage transformer; for 300B driving tube
LL1692A 1+1+1+1 : 1.75+1.75 Numerous connection alternatives; parameters between LL1660 and LL1671
LL2745 1+1+1+1 : 2.6 + 2.6 Numerous connection alternatives, SE or PP

Tube Amplifier Input Transformers

Type

Turns Ratio

Usage/Comment

LL1544A 1+1+1+1 : 2+2 Line input. Amorphous core
LL1545A 1+1+1+1 : 2+2 Line input. Mu metal core
LL1674 1+1 : 4+4 High level input. Amorphous core
LL1676 1+1 : 2+2 High level input. Amorphous core
LL1690 1+1 : 1+1 High level input. Amorphous core
LL1948 1+1 : 1+1 High level input. Amorphous core with Cardas high purity copper wire coils.
LL1948Ag 1+1 : 1+1 High level input. Amorphous core with high purity silver wire coils.
LL7901 1+1+1+1 : 1+1+1+1 Very high level line input
LL7902 1+1+1+1 : 1+1+1+1 High level line input

Preamplifier Output Transformers

Type

Turns Ratio

Usage/Comment

LL1630 7.2+7.2 : 1+1 High ratio output, SE or PP
LL1660 1+1+1+1 : 2.25+2.25 Numerous connection alternatives, SE or PP
LL1674 4+4 : 1+1 Parallel feed output. Amorphous core.
LL1676 2+2 : 1+1 Parallel feed output. Amorphous core.
LL1680 9+9 : 1+1+1+1 Replacement for UTC LS-27 transformer
LL1689 9+9 : 1+1+1+1 Numerous connection alternatives, SE or PP
LL1692A 1+1+1+1 : 1.75+1.75 Numerous connection alternatives; SE or PP
LL1930 5.6+5.6 : 1+1 Parallel feed output, unshielded
LL2745 2.6 + 2.6 : 1+1+1+1 Numerous connection alternatives, SE or PP

Line Level Input Transformers

Type

Turns Ratio

Usage/Comment

LL1531 1+1:2 Mu metal core. Small size
LL1540 1+1 : 1+1 High impedance line input
LL1544A 1+1+1+1 : 2+2 Line input. Amorphous core
LL1545A 1+1+1+1 : 2+2 Line input. Mu metal core
LL1592 1+1: 1+1 Improved, larger version of LL1540
LL1674 1+1 : 4+4 High level input. Amorphous core
LL1676 1+1 : 2+2 High level input. Amorphous core
LL1690 1+1 : 1+1 High level input. Amorphous core
LL1948 1+1 : 1+1 High level input. Amorphous core with Cardas high purity copper wire coils.
LL1948Ag 1+1 : 1+1 High level input. Amorphous core with high purity silver wire coils.
LL7901 1+1+1+1 : 1+1+1+1 Very high level line input
LL7902 1+1+1+1 : 1+1+1+1 High level line input

Line Level Output Transformers

Type

Turns Ratio

Usage/Comment

LL1517 1+1 : 1+1 Low impedance balanced or unbalanced drive solid state drive
LL1524 1+1 : 1+1 Low impedance balanced or unbalanced drive solid state drive
LL1539 2: 1+1 Low impedance balanced or unbalanced drive solid state drive
LL1585 1+1 : 1+1 High level, low impedance balanced or unbalanced drive solid state drive
LL1588 1+1 : 1+1 Low impedance unbalanced solid state drive.
LL2811 1+1 : 1+1 Low impedance balanced or unbalanced drive solid state drive, Euroboard size
LL1684 1+1 : 1+1 Amorphous core, low impedance unbalanced solid state drive.
LL5402 2 : 1+1 Low impedance unbalanced solid state drive.
LL2734 1:1.4 Single-ended BJT drive

MC Phono Input Transformers

Type

Turns Ratio

Usage/Comment

LL1678 1+1+1+1 : 16+16 Moving coil input. Amorphous core
LL1681 1+1 : 13+13 Moving coil input. Mu metal core
LL1931 1+1 : 8+8 Moving coil input. Amorphous core with Cardas high purity copper wire coils.
LL1931Ag 1+1 : 8+8 Moving coil input. Amorphous core with high purity silver wire coils.
LL1933 1+1 : 8+8 Moving coil input. Mu-metal core with Cardas high purity copper wire coils.
LL1933Ag 1+1 : 8+8 Moving coil input. Mu-metal core with high purity silver wire coils.
LL1941 1+1 : 16+16 Moving coil input. Amorphous core with Cardas high purity copper wire coils.
LL1941Ag 1+1 : 16+16 Moving coil input. Amorphous core with high purity silver wire coils.
LL1943 1+1 : 16+16 Moving coil input. Mu-metal core with Cardas high purity copper wire coils.
LL1943Ag 1+1 : 16+16 Moving coil input. Mu-metal core with high purity silver wire coils.
LL9206 1+1+1+1 : 10+10 Moving coil input. Amorphous core
LL9226 1+1+1+1 : 10+10 Moving coil input. Amorphous core. Lower impedance than LL9206.

Audio Chokes

Type

Inductance

Usage/Comment

LL1667 Various, 270H+ Tube anode choke. Various DC currents
LL1668 Various, 40H+ Tube anode choke. Various DC currents
LL1670 540 H Grid choke. 0.8mA
LL2743 Various, 40H+ Tube anode choke for higher current

Power Transformers

Type

Secondary Voltages

Usage/Comment

LL1648 350 V, 2×5.9 V, 2×6.6 V Mains transformer
LL1649 230 V, 4×6.6 V Mains transformer
LL1650 350 V, 4×6.6 V Mains transformer
LL1651 500 V, 4×6.6 V Mains transformer
LL1669A 340 V, 4×6.6 V, 1×110 V Mains transformer
LL1683 2x250V, 2×6.6V, 2×5.2V, 1x48V Mains transformer
LL2738 8×6.6V, 1x110V Mains transformer

Power Supply Chokes

Type

Inductance

Usage/Comment

LL1638 1 – 8 H Mains choke
LL1673 2.5 – 20 H Mains choke
LL1685 2.5 – 17H Mains choke
LL1694/1.5 40 – 160mH Filament choke designed for DC supply directly heated tube filament.
LL2733/1.7A 0.1 – 0.4H Filament choke designed for DC supply directly heated tube filament.

Digital Audio Transformers

Type

Impedance Ratio

Usage/Comment

LL1572 110 : 110 ohms Digital audio
LL1573 110 : 110 + 110 ohms Digital audio splitting
LL1574 110 : 75 ohms Digital audio AES/EBU : SPDIF interface
LL1593 110 : 110 + 110 + 110 ohms Digital audio splitting

Microphone Input Transformers

Type

Turns Ratio

Usage/Comment

LL1532 1+1:2 Mu metal core. Small size
LL1571 1+1 : 1.75+1.75 Mu metal core. Also useful for splitting
LL1528 1+1 : 2.5+2.5 Mu metal core. Pin compatible with LL1530
LL1530 1+1 : 3.5+3.5 Mu metal core.
LL1538XL 1 : 2.5+2.5 Mu metal core, very popular mic input transformer
LL1550 1+1+1+1 : 4+4 Amorphous core
LL1576 1+1 : 7 Mu metal core. Pin compatible with LL1538XL
LL1577 1+1 : 14 Mu metal core. Pin compatible with LL1538XL
LL1578XL 1 : 5+5 Mu metal core
LL1587 1+1:4 Mu metal core, small size
LL1636 1+1+1+1 : 10+10 Amorphous core
LL1674 1+1 : 4+4 Amorphous core
LL1676 1+1 : 2+2 Amorphous core
LL1922 1+1 : 4+4 Mu metal core, similar to UTC HA-100X and LS-10X
LL1935 1+1 : 5+5 Mu metal core, excellent DI box transformer, as well.
LL1936 2:8, 3:8, 4:8, 6:8 Mu metal core
LL7903 1+1+1+1 : 2+2+2+2 Mu metal, high level mic input
LL7905 1+1+1+1 : 5.6+5.6 Mu metal, high level mic input

Ribbon Microphone Transformers

Type

Turns Ratio

Usage/Comment

LL2912 1+1+1+1 : 37 Amorphous amorphous core transformer, wire leads.
LL2913 1+1+1+1 : 37 Amorphous core transformer, PC mount
LL2914 1+1+1+1 : 37 mu-metal core transformer, PC mount
LL2915 1+1+1+1 :37 Mu-metal transformer, wire leads.
LL1927A 1+1 : 55+55 amorphous core transformer, PC mount, intended for use with active buffer

Microphone Output Transformers

Type

Turns Ratio

Usage/Comment

LL1940 9 : 1+1 Tube microphone output with “vintage” character

General Purpose Transformers

Type

Turns Ratio

Usage/Comment

LL1527 1+1 : 1+1 THE general purpose “600 ohm” transformer
LL1527XL 1+1 : 1+1 THE general purpose “600 ohm” transformer
LL1570 1+1 : 1+1 Splitting transformer
LL1570XL 1+1 : 1+1 Splitting transformer
LL1581XL 1+1 : 1+1 Splitting transformer
LL1591 1+1 : 1+1 unshielded version of LL1527