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Jensen Transformers JT-123-BMCF Line Output Transformer

Line output transformer, with bifilar windings, 80% nickel laminations, +27dBu @ 20Hz

Jensen Transformers JT-123-BMCF Lline Output Transformer

Jensen Transformers JT-123-BMCF Lline Output Transformer

Jensen Transformers JT-123-BMCF line output transformers 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. Hum can be substantially reduced due to the isolation they afford.  JT-123-BMCF offers the industry’s best combination of bandwidth, level handling, distortion performance, and extremely low “leakage” (effective series) inductance to drive very long cables.

Here are some key specs:

  • Impedance ratio: 600:600
  • Turns ratio: 1:1
  • Maximum 20 Hz input: +27 dBu
  • THD @ 20 Hz: 0.002 %
  • Frequency Response: 20 - 20 KHz,  -0.01 / +0.00 dB
  • See spec sheet for additional details

The JT-123-BMCF is backed by the manufacturer's comprehensive one-year warranty, and has a remarkable 20-year warranty on the transformer device itself.

Jensen Transformers' Description

Jensen Transformers JT-123-BMCF Line Output Transformer


  • Distortion 0.002% typ at 20 Hz and +4 dBu output level
  • Wide bandwidth: -3 dB at 0.05 Hz and 325 kHz
  • Drives 600 Ω loads to levels up to +27 dBu at 20 Hz
  • Excellent time domain performance: DLP 0.7° typ 20 Hz to 20 kHz
  • Loading loss only 1.1 dB when driving 600 Ω load

This transformer is characterized for 1:2 step-up applications in high performance line output stages. For 1:1 applications, consider the JT-11-BMCF. The 80% nickel core material allows high output levels with very low distortion. Driving signals should be free of DC and source impedance as low as possible.

Jensen Transformers JT-123-BMCF, included items

We include a printed copy of the datasheet, as well as the transformer itself.

Jensen Transformers JT-123-BMCF, PRODUCT BOX

The JT-123-BMCF is packaged in a small cardboard box as shown here.

Jensen Transformers JT-123-BMCF Specs - click to download PDF

Here is the JT-123-BMCF spec sheet.  PDF format. 

Please notice that while the manufacturer has not updated the datasheet at the time of this writing, these transformers are now made in Canada.

Purchase Information
Product Description SKU MSRP Your Price Quantity
Jensen Transformers Line Output Transformer with bifilar windings, 80% nickel laminations JT-123-BMCF $179.99 $149.99
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