Audio Transformers / Signal Transformers

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J Series Shielded Audio Transformers

Triad Magnetics J Series Shielded Audio Transformers feature high-nickel laminations, paper section windings, and a specially tooled shielding enclosure with mu-metal, a nickel-iron soft ferromagnetic alloy with high permeability. These classic transformers were created in the 1950s and are ideal for both new and vintage audio gear, sound processing, and analog studio recording equipment. The J Series offers a shielded audio impedance matching design for a warm signal, while the single-hole mounting enables rotation for maximum hum reduction. Triad Magnetics J Series Shielded Audio Transformers are available in a variety of overall turn ratios and feature a maximum input level of 1mW to 500mW.

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Image	Part #	Mfr.	Description	Datasheet	Availability	Pricing (IDR) Filter the results in the table by unit price based on your quantity.	Qty.	Product	Type	Termination Style	Frequency Range	Inductance	Primary Impedance	Secondary Impedance	Minimum Operating Temperature	Maximum Operating Temperature	Height	Series
Audio Transformers / Signal Transformers 600/250/50 ohms:60K ohms (1:10.0) 10mW A-11J Triad Magnetics 1: Rp3.039.015 22In Stock	Mfr. Part No. A-11J Mouser Part No 553-A-11J	Triad Magnetics	Audio Transformers / Signal Transformers 600/250/50 ohms:60K ohms (1:10.0) 10mW Learn More about Triad Magnetics triad j series audio transformers	Datasheet	22In Stock	Rp3.039.015 Rp2.740.892 Rp2.664.023 Rp2.612.103 View Quote	Min.: 1 Mult.: 1	Audio Transformers	Audio Transformer	Wire Lead	20 Hz to 20 kHz	7 H	50 Ohms, 250 Ohms, 600 Ohms	60 kOhms	0 C	+ 70 C	1.81 in	AJ
Audio Transformers / Signal Transformers 600CT/150 ohms:60K ohms (1:10.0) 10mW A-12J Triad Magnetics 1: Rp3.097.722 19In Stock	Mfr. Part No. A-12J Mouser Part No 553-A-12J	Triad Magnetics	Audio Transformers / Signal Transformers 600CT/150 ohms:60K ohms (1:10.0) 10mW Learn More about Triad Magnetics triad j series audio transformers	Datasheet	19In Stock	Rp3.097.722 Rp2.718.143 Rp2.662.188 Rp2.595.042 View Quote	Min.: 1 Mult.: 1	Audio Transformers	Audio Transformer	Wire Lead	20 Hz to 20 kHz	7 H	150 Ohms, 600 Ohms	60 kOhms	0 C	+ 70 C	1.81 in	AJ
Audio Transformers / Signal Transformers 600CT/150 ohms:600CT/150 ohms (1:1) 50mW A-67J Triad Magnetics 1: Rp2.860.508 11In Stock 7Expected 02/10/2026	Mfr. Part No. A-67J Mouser Part No 553-A-67J	Triad Magnetics	Audio Transformers / Signal Transformers 600CT/150 ohms:600CT/150 ohms (1:1) 50mW Learn More about Triad Magnetics triad j series audio transformers	Datasheet	11In Stock 7Expected 02/10/2026	Rp2.860.508 Rp2.591.189 Rp2.534.133 Rp2.489.552 View Quote	Min.: 1 Mult.: 1	Audio Transformers	Audio Transformer	Wire Lead	20 Hz to 20 kHz		150 Ohms, 600 Ohms	150 Ohms, 600 Ohms	0 C	+ 70 C	1.81 in	AJ
Audio Transformers / Signal Transformers 600/250/50 ohms:85K ohms (1:12.0) 1mW A-9J Triad Magnetics 1: Rp2.905.823 20In Stock	Mfr. Part No. A-9J Mouser Part No 553-A-9J	Triad Magnetics	Audio Transformers / Signal Transformers 600/250/50 ohms:85K ohms (1:12.0) 1mW Learn More about Triad Magnetics triad j series audio transformers	Datasheet	20In Stock	Rp2.905.823 Rp2.633.018 Rp2.471.390 Rp2.458.731 View Quote	Min.: 1 Mult.: 1	Audio Transformers	Audio Transformer	Wire Lead	30 Hz to 15 kHz		50 Ohms, 250 Ohms, 600 Ohms	85 kOhms	0 C	+ 70 C	1.81 in	AJ
Audio Transformers / Signal Transformers 600CT/150 ohms:60K ohms (1:10.5) 1mW A-10J Triad Magnetics 1: Rp2.876.836 8In Stock	Mfr. Part No. A-10J Mouser Part No 553-A-10J	Triad Magnetics	Audio Transformers / Signal Transformers 600CT/150 ohms:60K ohms (1:10.5) 1mW Learn More about Triad Magnetics triad j series audio transformers	Datasheet	8In Stock	Rp2.876.836 Rp2.640.907 Rp2.609.535 Rp2.563.670 View Quote	Min.: 1 Mult.: 1	Audio Transformers	Audio Transformer	Wire Lead	30 Hz to 15 kHz		600 Ohms, 150 Ohms	60 kOhms	0 C	+ 70 C	1.81 in	AJ
Audio Transformers / Signal Transformers 600/250/50 ohms:600/250/50 ohms (1:1) 50mW A-57J Triad Magnetics 1: Rp3.095.337 13Factory Stock Available	Mfr. Part No. A-57J Mouser Part No 553-A-57J	Triad Magnetics	Audio Transformers / Signal Transformers 600/250/50 ohms:600/250/50 ohms (1:1) 50mW Learn More about Triad Magnetics triad j series audio transformers	Datasheet	13Factory Stock Available More Info Available	Rp3.095.337 Rp2.779.602 Rp2.687.872 Rp2.629.165 View Quote	Min.: 1 Mult.: 1	Audio Transformers	Audio Transformer	Wire Lead			50 Ohms, 250 Ohms, 600 Ohms	50 Ohms, 250 Ohms, 600 Ohms			1.81 in	AJ
Audio Transformers / Signal Transformers 600/300/200CT/110/50 ohms:600CT/150 ohms (1:1.0) 1mW A-13J Triad Magnetics 1: Rp2.907.658 Non-Stocked Lead-Time 12 Weeks	Mfr. Part No. A-13J Mouser Part No 553-A-13J	Triad Magnetics	Audio Transformers / Signal Transformers 600/300/200CT/110/50 ohms:600CT/150 ohms (1:1.0) 1mW Learn More about Triad Magnetics triad j series audio transformers	Datasheet	Non-Stocked Lead-Time 12 Weeks	Rp2.907.658 Rp2.837.759 Rp2.792.261 Rp2.754.652 View Quote	Min.: 1 Mult.: 1	Audio Transformers	Audio Transformer	Wire Lead			50 Ohms, 110 Ohms, 200 Ohms, 300 Ohms, 600 Ohms	150 Ohms, 600 Ohms			1.81 in	AJ
Audio Transformers / Signal Transformers 600CT/150 ohms:20K ohms (1:5.77) 10mW A-14J Triad Magnetics 20: Rp2.761.807 Non-Stocked Lead-Time 12 Weeks	Mfr. Part No. A-14J Mouser Part No 553-A-14J	Triad Magnetics	Audio Transformers / Signal Transformers 600CT/150 ohms:20K ohms (1:5.77) 10mW Learn More about Triad Magnetics triad j series audio transformers		Non-Stocked Lead-Time 12 Weeks	Rp2.761.807 Rp2.724.564 View Quote	Min.: 20 Mult.: 20						600 Ohms, 150 Ohms	20 kOhms				AJ
Audio Transformers / Signal Transformers 600/250/50 ohms:20K ohms (1:577) 10mW A-15J Triad Magnetics 1: Rp3.055.710 Non-Stocked Lead-Time 12 Weeks	Mfr. Part No. A-15J Mouser Part No 553-A-15J	Triad Magnetics	Audio Transformers / Signal Transformers 600/250/50 ohms:20K ohms (1:577) 10mW Learn More about Triad Magnetics triad j series audio transformers		Non-Stocked Lead-Time 12 Weeks	Rp3.055.710 Rp2.927.838 Rp2.744.929 Rp2.708.787 View Quote	Min.: 1 Mult.: 1						600 Ohms, 250 Ohms, 50 Ohms	20 kOhms				AJ
Audio Transformers / Signal Transformers 15K ohms:115KCT ohms (1:2.76) 10mW A-40J Triad Magnetics 20: Rp2.708.237 Non-Stocked Lead-Time 12 Weeks	Mfr. Part No. A-40J Mouser Part No 553-A-40J	Triad Magnetics	Audio Transformers / Signal Transformers 15K ohms:115KCT ohms (1:2.76) 10mW Learn More about Triad Magnetics triad j series audio transformers	Datasheet	Non-Stocked Lead-Time 12 Weeks	Rp2.708.237 Rp2.671.545 View Quote	Min.: 20 Mult.: 20	Audio Transformers	Audio Transformer	Wire Lead			15 kOhms	115 kOhms			1.81 in	AJ
Audio Transformers / Signal Transformers 15K ohms 8mADC:80KCT ohms (1:2.3) 32mW 8mA A-41J Triad Magnetics 20: Rp2.727.683 Non-Stocked Lead-Time 12 Weeks	Mfr. Part No. A-41J Mouser Part No 553-A-41J	Triad Magnetics	Audio Transformers / Signal Transformers 15K ohms 8mADC:80KCT ohms (1:2.3) 32mW 8mA Learn More about Triad Magnetics triad j series audio transformers	Datasheet	Non-Stocked Lead-Time 12 Weeks	Rp2.727.683 Rp2.655.767 View Quote	Min.: 20 Mult.: 20	Audio Transformers	Audio Transformer	Wire Lead			15 kOhms	80 kOhms			1.81 in	AJ
Audio Transformers / Signal Transformers 500CT/125 ohms :2KCT/500 ohms (1:2.0) 100mW 20mA A-52J Triad Magnetics 20: Rp2.391.401 Non-Stocked Lead-Time 12 Weeks	Mfr. Part No. A-52J Mouser Part No 553-A-52J	Triad Magnetics	Audio Transformers / Signal Transformers 500CT/125 ohms :2KCT/500 ohms (1:2.0) 100mW 20mA Learn More about Triad Magnetics triad j series audio transformers	Datasheet	Non-Stocked Lead-Time 12 Weeks	Rp2.391.401 Rp2.354.342 View Quote	Min.: 20 Mult.: 20	Audio Transformers	Audio Transformer	Wire Lead			125 Ohms, 500 Ohms	500 Ohms, 2 kOhms			1.81 in	AJ
Audio Transformers / Signal Transformers 15K ohms:600/250/75 ohms (5.0:1) 100mW A-55J Triad Magnetics 20: Rp2.677.048 Non-Stocked Lead-Time 12 Weeks	Mfr. Part No. A-55J Mouser Part No 553-A-55J	Triad Magnetics	Audio Transformers / Signal Transformers 15K ohms:600/250/75 ohms (5.0:1) 100mW Learn More about Triad Magnetics triad j series audio transformers	Datasheet	Non-Stocked Lead-Time 12 Weeks	Rp2.677.048 Rp2.609.352 View Quote	Min.: 20 Mult.: 20	Audio Transformers	Audio Transformer	Wire Lead			15 kOhms	50 Ohms, 250 Ohms, 600 Ohms			1.81 in	AJ
Audio Transformers / Signal Transformers 500CT/125 ohms :16/4 ohms (5.6:1) 100mW 15mA A-56J Triad Magnetics 20: Rp2.406.628 Non-Stocked Lead-Time 12 Weeks	Mfr. Part No. A-56J Mouser Part No 553-A-56J	Triad Magnetics	Audio Transformers / Signal Transformers 500CT/125 ohms :16/4 ohms (5.6:1) 100mW 15mA Learn More about Triad Magnetics triad j series audio transformers	Datasheet	Non-Stocked Lead-Time 12 Weeks	Rp2.406.628 Rp2.369.936 View Quote	Min.: 20 Mult.: 20	Audio Transformers	Audio Transformer	Wire Lead			125 Ohms, 500 Ohms	4 Ohms, 16 Ohms			1.81 in	AJ
Audio Transformers / Signal Transformers 10KCT/2500 ohms:2000CT/500 (2.24:1) 100mW A-58J Triad Magnetics 20: Rp2.566.605 Non-Stocked Lead-Time 12 Weeks	Mfr. Part No. A-58J Mouser Part No 553-A-58J	Triad Magnetics	Audio Transformers / Signal Transformers 10KCT/2500 ohms:2000CT/500 (2.24:1) 100mW Learn More about Triad Magnetics triad j series audio transformers	Datasheet	Non-Stocked Lead-Time 12 Weeks	Rp2.566.605 Rp2.531.931 View Quote	Min.: 20 Mult.: 20	Audio Transformers	Audio Transformer	Wire Lead			2.5 kOhms, 10 kOhms	500 Ohms, 2 kOhms			1.81 in	AJ
Audio Transformers / Signal Transformers 600/150 ohms:600/150 ohms (1.4:1:1) 50mW A-61J Triad Magnetics 20: Rp2.748.047 Non-Stocked Lead-Time 8 Weeks	Mfr. Part No. A-61J Mouser Part No 553-A-61J	Triad Magnetics	Audio Transformers / Signal Transformers 600/150 ohms:600/150 ohms (1.4:1:1) 50mW Learn More about Triad Magnetics triad j series audio transformers	Datasheet	Non-Stocked Lead-Time 8 Weeks	Rp2.748.047 Rp2.711.722 View Quote	Min.: 20 Mult.: 20	Audio Transformers	Audio Transformer	Wire Lead	20 Hz to 20 kHz	7 H	150 Ohms, 600 Ohms	150 Ohms, 600 Ohms	0 C	+ 70 C	1.81 in	AJ
Audio Transformers / Signal Transformers 15KCT ohms:600CT/150 ohms (5.0:1) 100mW A-65J Triad Magnetics 20: Rp2.631.734 Non-Stocked Lead-Time 12 Weeks	Mfr. Part No. A-65J Mouser Part No 553-A-65J	Triad Magnetics	Audio Transformers / Signal Transformers 15KCT ohms:600CT/150 ohms (5.0:1) 100mW Learn More about Triad Magnetics triad j series audio transformers	Datasheet	Non-Stocked Lead-Time 12 Weeks	Rp2.631.734 Rp2.564.587 View Quote	Min.: 20 Mult.: 20	Audio Transformers	Audio Transformer	Wire Lead			15 kOhms	150 Ohms, 600 Ohms			1.81 in	AJ
Audio Transformers / Signal Transformers 15K ohms :600/250/50 ohms (5.0:2) 100mW 4mA A-66J Triad Magnetics 20: Rp2.636.320 Non-Stocked Lead-Time 12 Weeks	Mfr. Part No. A-66J Mouser Part No 553-A-66J	Triad Magnetics	Audio Transformers / Signal Transformers 15K ohms :600/250/50 ohms (5.0:2) 100mW 4mA Learn More about Triad Magnetics triad j series audio transformers	Datasheet	Non-Stocked Lead-Time 12 Weeks	Rp2.636.320	Min.: 20 Mult.: 20	Audio Transformers	Audio Transformer	Wire Lead			15 kOhms	50 Ohms, 250 Ohms, 600 Ohms			1.81 in	AJ
Audio Transformers / Signal Transformers 15KCT ohms :600CT/150 ohms (5.0:3) 100mW 4mA A-68J Triad Magnetics 20: Rp2.726.949 Non-Stocked Lead-Time 12 Weeks	Mfr. Part No. A-68J Mouser Part No 553-A-68J	Triad Magnetics	Audio Transformers / Signal Transformers 15KCT ohms :600CT/150 ohms (5.0:3) 100mW 4mA Learn More about Triad Magnetics triad j series audio transformers	Datasheet	Non-Stocked Lead-Time 12 Weeks	Rp2.726.949 Rp2.690.808 View Quote	Min.: 20 Mult.: 20	Audio Transformers	Audio Transformer	Wire Lead			15 kOhms	150 Ohms, 600 Ohms			1.81 in	AJ
Audio Transformers / Signal Transformers 25KCT/6250 ohms :500CT/125 ohms (7.0:1:1) 100mW 5mA A-69J Triad Magnetics 20: Rp2.624.579 Non-Stocked Lead-Time 12 Weeks	Mfr. Part No. A-69J Mouser Part No 553-A-69J	Triad Magnetics	Audio Transformers / Signal Transformers 25KCT/6250 ohms :500CT/125 ohms (7.0:1:1) 100mW 5mA Learn More about Triad Magnetics triad j series audio transformers	Datasheet	Non-Stocked Lead-Time 12 Weeks	Rp2.624.579 Rp2.589.905 View Quote	Min.: 20 Mult.: 20	Audio Transformers	Audio Transformer	Wire Lead			6.25 kOhms, 25 kOhms	125 Ohms, 500 Ohms			1.81 in	AJ
Audio Transformers / Signal Transformers 600CT/150 ohms:600CT/150 ohms (1.82:1) 200mW A-78J Triad Magnetics 20: Rp2.780.703 Non-Stocked Lead-Time 12 Weeks	Mfr. Part No. A-78J Mouser Part No 553-A-78J	Triad Magnetics	Audio Transformers / Signal Transformers 600CT/150 ohms:600CT/150 ohms (1.82:1) 200mW Learn More about Triad Magnetics triad j series audio transformers	Datasheet	Non-Stocked Lead-Time 12 Weeks	Rp2.780.703 Rp2.743.094 View Quote	Min.: 20 Mult.: 20	Audio Transformers	Audio Transformer	Wire Lead			2 kOhms	150 Ohms, 600 Ohms			1.81 in	AJ
Audio Transformers / Signal Transformers 1K ohms 10mADC:200CT/50 ohms (2.2:1) 200mW 10mA A-79J Triad Magnetics 20: Rp2.678.333 Non-Stocked Lead-Time 12 Weeks	Mfr. Part No. A-79J Mouser Part No 553-A-79J	Triad Magnetics	Audio Transformers / Signal Transformers 1K ohms 10mADC:200CT/50 ohms (2.2:1) 200mW 10mA Learn More about Triad Magnetics triad j series audio transformers	Datasheet	Non-Stocked Lead-Time 12 Weeks	Rp2.678.333 Rp2.592.290	Min.: 20 Mult.: 20	Audio Transformers	Audio Transformer	Wire Lead			1 kOhms	50 Ohms, 200 Ohms			1.81 in	AJ

J Series Shielded Audio Transformers

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