Tube amplifier output transformers

All OPTs are built in our dual coil single C-core style and can be ordered with a choice of core air-gap for Push-Pull or Single-Ended applications. Most of our OPTs can be configured for different primary and secondary impedances. The use of C-cores with well-defined air-gap results in an almost constant inductance throughout the whole operating voltage range. For SE transformers, the primary inductance variation due to signal level is less than 7%.

Most of the transformers below are available with amorphous iron C-cores. The amorphous cores are considered to have sonic advantages, but the signal level capability with amorphous core is about 30% less than with a conventional silicon-iron C-core.

Tube output

Primary impedanceSecondary impedanceMax power capability at 30 Hz, Push-PullMax power capability at 30 Hz, Single EndWeightTransformer typeConfiguration
6004 Ω700W140W4.5 kgLL1693
6504 Ω250W50W2.5 kgLL1627C
6804 Ω700W140W4.6 kgLL2768C
6808 Ω700W140W4.6 kgLL2768D
68016 Ω700W140W4.6 kgLL2768E
1k4 Ω360W70W4.5 kgLL1693B
1.2k4 Ω125W25W2.5 kgLL1627B
1.2k4 Ω180W36W2.5 kgLL2752C
1.2k4 Ω360W70W4.6 kgLL2768B
1.2k8 Ω125W25W2.5 kgLL1627C
1.2k8 Ω180W36W2.5 kgLL2752D
1.2k8 Ω360W70W4.6 kgLL2768C
1.2k16 Ω125W25W2.5 kgLL1627D
1.2k16 Ω360W70W4.6 kgLL2768D
1.6k4 Ω250W50W2.5 kgLL1623C
1.6k8 Ω250W50W2.5 kgLL1623D
1.6k16 Ω250W50W2.5 kgLL1623E
2k4 Ω105W21W2.5 kgLL2752B
2k8 Ω105W21W2.5 kgLL2752C
2k16 Ω105W21W2.5 kgLL2752D
2.3k8 Ω62W13W2.5 kgLL1627B
2.3k8 Ω180W35W4.5 kgLL1693
2.3k16 Ω62W13W2.5 kgLL1627C
2.3k16 Ω180W35W4.5 kgLL1693
2.6k4 Ω188W36W2.5 kgLL1679C
2.6k8 Ω188W36W2.5 kgLL1679D
2.6k16 Ω188W36W2.5 kgLL1679E
2.7k8 Ω180W35W4.6 kgLL2768B
2.7k16 Ω180W35W4.6 kgLL2768C
3k4 Ω125W25W2.5 kgLL1623B
3k5 Ω-16W2.5 kgLL2785C5 Ω (tap)
3k8 Ω-16W2.5 kgLL2785C8 Ω (tap)
3k8 Ω12W2.2W0.75 kgLL2766B
3k8 Ω55W10W1.4 kgLL1664-
3k8 Ω125W25W2.5 kgLL1623C
3k16 Ω12W2.2W0.75 kgLL2766C
3.1k5 Ω105W21W2.5 kgLL2770
3.1k : 5
3.2k8 Ω100W20W2.5 kgLL27703.1k : 8
3k16 Ω125W25W2.5 kgLL1623D
3.3k4 Ω250W50W2.5 kgLL1620C
3.3k8 Ω250W50W2.5 kgLL1620D
3.3k16 Ω250W50W2.5 kgLL1620E
4.3k4 Ω 160W-2.5 kgLL37234 Ω (tap)
4.3k8 Ω 160W-2.5 kgLL37238 Ω (tap)
4 Ω105W20W2.5 kgLL1679B
4.5k8 Ω105W20W2.5 kgLL1679C
4.5k16 Ω105W20W2.5 kgLL1679D
4.6k8 Ω45W10W2.5 kgLL2752B
4.6k16 Ω45W10W2.5 kgLL2752C
4.7k5 Ω100W20W2.5 kgLL27695 Ω
4.7k5 and 8 Ω100W20W2.5 kgLL27695+8 (Elekit)
4.7k8 Ω100W20W2.5 kgLL27698 Ω
5k8 Ω40W8W1.4 kgLL1663-
5.5k4 Ω320W60W4.0 kg
5.5k5 Ω40W8W1.4 kgLL1682-
5.5k8 Ω320W60W4.0 kgLL1688D
5.5k16 Ω320W60W4.0 kgLL1688E
5.6k8 Ω62W13W2.5 kgLL1623B
5.6k16 Ω62W13W2.5 kgLL1623C
6k4 Ω24W4W0.75 kgLL2766B
6k4 Ω125W25W2.5 kgLL1620B
6k8 Ω24W4W0.75 kgLL2766C
6k8 Ω5W1.4 kgLL3720
6k8 Ω125W25W2.5 kgLL1620C
6k16 Ω24W4W0.75 kgLL2766D
6k16 Ω125W25W2.5 kgLL1620D
6.5k4 Ω350W50W2.5 kgLL9202C
6.5k8 Ω250W50W2.5 kgLL9202D
6.5k16 Ω250W50W2.5 kgLL9202E
9k8 Ω160W30W4.6 kgLL1691-
9.2k4 Ω160W30W4.0 kgLL1688B
9.2k8 Ω160W30W4.0 kgLL1688C
9.2k16 Ω160W30W4.0 kgLL1688D
9.7k8 Ω45W9W2.5 kgLL1679B
9.7k16 Ω45W9W2.5 kgLL1679C
10k4 Ω160W30W4.6 kgLL1691D-
10k16 Ω160W30W4.6 kgLL1691D-
11k4 Ω125W25W2.5 kgLL9202B
11k8 Ω95W18W4.6 kgLL2755-
11k8 Ω125W25W2.5 kgLL9202C
11k16 Ω125W25W2.5 kgLL9202D
11.5k8 Ω62W13W2.5 kgLL1620B
11.5k16 Ω62W13W2.5 kgLL1620C
16k4 Ω-5W1.4 kgLL2735F-
16k8 Ω-5W1.4 kgLL2735B-
16k16 Ω-5W1.4 kgLL2735F-
20k4 Ω160W30W4.6 kgLL1691E-
20k8 Ω160W30W4.6 kgLL1691B-
20k16 Ω160W30W4.6 kgLL1691E-
23k8 Ω62W13W2.5 kgLL9202B
23k16 Ω62W13W2.5 kgLL9202C

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