Line Output Transformer Selector Guide

Line output transformers are useful mainly because they allow any output stage circuit topology, whether balanced or unbalanced, to drive any equipment input, whether balanced or unbalanced, without regard to special connection rules or specific cables. Due to the isolation they afford, hum can be substantially reduced. Jensen output transformers are available in a wide variety of package styles and offer the industry’s best combination of bandwidth, level handling, and distortion performance. All have extremely low “leakage” (effective series) inductance that is required to drive very long cables. Various core materials are available based on the source impedance of the driving stage.

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Line Output Transformer for Vacuum Tube drivers

Has single Faraday shield and horizontal channel frame mounting

Model
Data sheet PDF
Impedance
Ratio
Turns
Ratio
Max Input
@ 20 Hz
THD
@ 20Hz
Freq Response
20Hz/20kHz
Price
USD
4+
Units
12+
Units
 
JT-10K61-1M Line output transformer, 4:1 CT or 8:1 step-down ratio with Faraday shield, for vacuum tube line outputs. Request
10k:600 4:1 +23 dBu 0.008% -0.01 dB / -0.37 dB $137.02 $124.57 $115.88
Model # Description Price USD 4+ units 12+ units Impedance Ratio Turns Ratio Max Input @ 20Hz THD @ 20Hz Freq Resp 20Hz / 20kHz
JT-10K61-1M Line output transformer, 4:1 CT or 8:1 step-down ratio with Faraday shield, for vacuum tube line outputs. $137.02 $124.57 $115.88 10k:600 4:1 +23 dBu 0.008% -0.01 dB / -0.37 dB Request

Line Level General Purpose 1:1 Bifilar Output Transformer

Unless otherwise noted, all are multifilar construction with either 50% (“L” types) or 80% (“M” types) nickel cores. Because they have no Faraday shield, these types are not recommended as input transformers. Characterized below for 0 Ohm source and 600 Ohm load.

Model
Data sheet PDF
Impedance
Ratio
Turns
Ratio
Max Input
@ 20 Hz
THD
@ 20Hz
Freq Response
20Hz/20kHz
Price
USD
4+
Units
12+
Units
 
JT-11-YMPC Line output transformer, 1:1 ratio with bifilar windings, 80% nickel laminations, +8dBu @ 20Hz. PC board mount. Request
600:600 1:1 +8 dBu 0.005% -0.00 dB / -0.00 dB $32.18 $29.26 $27.21
JT-11-HFMPC Line output transformer, 1:1 ratio with bifilar windings, 80% nickel laminations, +18dBm @ 20Hz. PC board mount. Request
600:600 1:1 +18 dBu 0.008% -0.03 dB / -0.00 dB $41.43 $37.66 $35.04
JT-11-FLPCH Line output transformer, 1:1 ratio with bifilar windings, 50% nickel laminations, +21dBu @ 20Hz. PC board mount. Request
600:600 1:1 +21 dBu 0.035% -0.02 dB / -0.00 dB $35.94 $32.43 $30.16
JT-11-FLCF Line output, 1:1 ratio with bifilar windings, 50% nickel laminations, +21dBu @ 20Hz. Channel frame mounting bracket included. Request
600:600 1:1 +21 dBu 0.035% -0.02 dB / -0.00 dB $36.99 $33.63 $31.29
JT-11-EMCF JT-11-EMPC Line output transformer, bifilar windings, 80% nickel laminations, +18dBu @ 20Hz. Channel frame mounting bracket included. Request
600:600 1:1 +18 dBu 0.007% -0.02 dB / -0.00 dB $66.85 $60.78 $56.53
JT-11-ELCF Line output transformer, with bifilar windings, 50% nickel laminations, +24dBu @ 20Hz. Channel frame mounting bracket included. Request
600:600 1:1 +24 dBu 0.028% -0.03 dB / -0.00dB $49.62 $45.11 $41.96
JT-11-DMCF JT-11-DMPC Line output transformer, with bifilar windings, 80% nickel laminations, +22dBu @ 20Hz. Channel frame mounting bracket included. Request
600:600 1:1 +22 dBu 0.004% -0.02 dB / -0.00 dB $80.38 $73.08 $67.98
JT-11-BMCF Line output transformer, with bifilar windings, 80% nickel laminations, +27dBu @ 20Hz. Channel frame mounting bracket included. Request
600:600 1:1 +27 dBu 0.002% -0.01 dB / -0.00 dB $107.99 $98.19 $91.33
Model # Description Price USD 4+ units 12+ units Impedance Ratio Turns Ratio Max Input @ 20Hz THD @ 20Hz Freq Resp 20Hz / 20kHz
JT-11-YMPC Line output transformer, 1:1 ratio with bifilar windings, 80% nickel laminations, +8dBu @ 20Hz. PC board mount. $32.18 $29.26 $27.21 600:600 1:1 +8 dBu 0.005% -0.00 dB / -0.00 dB Request
JT-11-HFMPC Line output transformer, 1:1 ratio with bifilar windings, 80% nickel laminations, +18dBm @ 20Hz. PC board mount. $41.43 $37.66 $35.04 600:600 1:1 +18 dBu 0.008% -0.03 dB / -0.00 dB Request
JT-11-FLPCH Line output transformer, 1:1 ratio with bifilar windings, 50% nickel laminations, +21dBu @ 20Hz. PC board mount. $35.94 $32.43 $30.16 600:600 1:1 +21 dBu 0.035% -0.02 dB / -0.00 dB Request
JT-11-FLCF Line output, 1:1 ratio with bifilar windings, 50% nickel laminations, +21dBu @ 20Hz. Channel frame mounting bracket included. $36.99 $33.63 $31.29 600:600 1:1 +21 dBu 0.035% -0.02 dB / -0.00 dB Request
JT-11-EMCF JT-11-EMPC Line output transformer, bifilar windings, 80% nickel laminations, +18dBu @ 20Hz. Channel frame mounting bracket included. $66.85 $60.78 $56.53 600:600 1:1 +18 dBu 0.007% -0.02 dB / -0.00 dB Request
JT-11-ELCF Line output transformer, with bifilar windings, 50% nickel laminations, +24dBu @ 20Hz. Channel frame mounting bracket included. $49.62 $45.11 $41.96 600:600 1:1 +24 dBu 0.028% -0.03 dB / -0.00dB Request
JT-11-DMCF JT-11-DMPC Line output transformer, with bifilar windings, 80% nickel laminations, +22dBu @ 20Hz. Channel frame mounting bracket included. $80.38 $73.08 $67.98 600:600 1:1 +22 dBu 0.004% -0.02 dB / -0.00 dB Request
JT-11-BMCF Line output transformer, with bifilar windings, 80% nickel laminations, +27dBu @ 20Hz. Channel frame mounting bracket included. $107.99 $98.19 $91.33 600:600 1:1 +27 dBu 0.002% -0.01 dB / -0.00 dB Request

Line Level Special Purpose Output Transformers

Model
Data sheet PDF
Impedance
Ratio
Turns
Ratio
Max Input
@ 20 Hz
THD
@ 20Hz
Freq Response
20Hz/20kHz
Price
USD
4+
Units
12+
Units
 
JT-11SS-DLCF-1:1 JT-11SS-DLCF-1:2 Line output transformer, 1:1 or 1:2 ratio with split bifilar windings, 50% nickel laminations, +30dBu @ 20Hz. Request
600:600 1:1 +30 dBu 0.025% -0.05 dB / -0.00 dB $71.25 $64.78 $60.26
JT-123-SLPC Line output transformer, 1:1 or 1:2 ratio with quadfilar windings, 50% nickel laminations, +24dBu @ 20Hz. PC board mount. Request
600:600 1:1 +24 dBu 0.018% -0.04 dB / +0.04 dB $57.63 $52.40 $48.74
JT-123-ELCF Line output transformer, 1:1 or 1:2 ratio with quadfilar windings, 50% nickel laminations, +24dBu @ 20Hz. Request
600:600 1:1 +24 dBu 0.018% -0.04 dB / -0.00 dB $54.97 $49.98 $46.49
JT-123-FLPCH Line output transformer, 1:1 or 1:2 ratio with quadfilar windings, 50% nickel laminations, +21dBu @ 20Hz. PC board mount. Request
600:600 1:1 +20 dBu 0.025% -0.04 dB / +0.04 dB $37.78 $34.35 $31.95
JT-123-DBX Line output transformer, for use as optional transformer in some dBx compressors, 50% nickel laminations, +24dBu @ 20Hz. Request
600:600 1:1 +24 dBu 0.018% -0.04 dB / +0.04 dB $57.63 $52.40 $48.74
JT-123-BMCF Line output transformer, 1:1 or 1:2 ratio with quadfilar windings, 80% nickel laminations, +27dBu @ 20Hz. Request
150:600 1:2 +27 dBu 0.002% -0.03 dB / -0.01 dB $107.99 $98.19 $91.33
JT-123-BLCF Line output transformer, 1:1 or 1:2 ratio with quadfilar windings, 50% nickel laminations, +33dBu @ 20Hz. Request
150:600 1:2 +35 dBu 0.022% -0.03 dB / +0.05 dB $86.69 $78.82 $73.32
Model # Description Price USD 4+ units 12+ units Impedance Ratio Turns Ratio Max Input @ 20Hz THD @ 20Hz Freq Resp 20Hz / 20kHz
JT-11SS-DLCF-1:1 JT-11SS-DLCF-1:2 Line output transformer, 1:1 or 1:2 ratio with split bifilar windings, 50% nickel laminations, +30dBu @ 20Hz. $71.25 $64.78 $60.26 600:600 1:1 +30 dBu 0.025% -0.05 dB / -0.00 dB Request
JT-123-SLPC Line output transformer, 1:1 or 1:2 ratio with quadfilar windings, 50% nickel laminations, +24dBu @ 20Hz. PC board mount. $57.63 $52.40 $48.74 600:600 1:1 +24 dBu 0.018% -0.04 dB / +0.04 dB Request
JT-123-ELCF Line output transformer, 1:1 or 1:2 ratio with quadfilar windings, 50% nickel laminations, +24dBu @ 20Hz. $54.97 $49.98 $46.49 600:600 1:1 +24 dBu 0.018% -0.04 dB / -0.00 dB Request
JT-123-FLPCH Line output transformer, 1:1 or 1:2 ratio with quadfilar windings, 50% nickel laminations, +21dBu @ 20Hz. PC board mount. $37.78 $34.35 $31.95 600:600 1:1 +20 dBu 0.025% -0.04 dB / +0.04 dB Request
JT-123-DBX Line output transformer, for use as optional transformer in some dBx compressors, 50% nickel laminations, +24dBu @ 20Hz. $57.63 $52.40 $48.74 600:600 1:1 +24 dBu 0.018% -0.04 dB / +0.04 dB Request
JT-123-BMCF Line output transformer, 1:1 or 1:2 ratio with quadfilar windings, 80% nickel laminations, +27dBu @ 20Hz. $107.99 $98.19 $91.33 150:600 1:2 +27 dBu 0.002% -0.03 dB / -0.01 dB Request
JT-123-BLCF Line output transformer, 1:1 or 1:2 ratio with quadfilar windings, 50% nickel laminations, +33dBu @ 20Hz. $86.69 $78.82 $73.32 150:600 1:2 +35 dBu 0.022% -0.03 dB / +0.05 dB Request

Inductors and Load isolators

Model # Inductance DC Resistance Impedance
@ 20Hz
Impedance
@ 20kHz
Impedance
@ 5MHz
Price USD 4+ units 12+ units  
  JT-OLI-3 3.7 μH 0.27Ω 0.27Ω .032Ω 40Ω $4.65 $4.23 $3.93 Buy Now

 

Transformer Styles

output-wirelead-transformer

Wire Lead – Standard wire termination with retainer clamp

output-pc-transformer

Printed Circuit - for direct soldering to printed circuit boards 

oli

Load Isolators – for decoupling capacitive loads at high frequencies 

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