Signal Processing Systems : Audio Transformers : Jensen Transformers, Inc. - JT-115K-E

Microphone Input Transformer with 0.065% Distortion Ratio

Model: JT-115K-E

Ideal for FET or vacuum tube input amplifiers
Wide bandwidth -3dB at 2.5Hz and 90kHz
20dB of voltage gain with noise figure of only 1.5dB
Input impedance of 1.4kohms for loading loss of 0.9dB
High common-mode rejection 110dB at 60Hz

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JT-115K-E transformer is designed for highest practical step-up ratio. Its secondary source impedance makes it ideal for use with low noise FET or vacuum tube input amplifiers. The primary is fully balanced and its leads may be reversed to invert polarity, if required. A 30dB magnetic shield package is standard.

Ideal for FET or vacuum tube input amplifiers
Wide bandwidth -3dB at 2.5Hz and 90kHz
20dB of voltage gain with noise figure of only 1.5dB
Input impedance of 1.4kohms for loading loss of 0.9dB
High common-mode rejection 110dB at 60Hz

Audio Transformer Type - Input Transformer
Spec Sheet available - Yes

Operating Temperature (Maximum): 158 F
Operating Temperature (Minimum): 32 F
Maximum Bandwidth: 90 kHz (-3dB)
Impedance Ratio: 150:15k
Input Impedance: 1.40 kohms (1kHz, -20dBu, test circuit 1)
Voltage Gain: 19.75 dB (1kHz, -20dBu, test circuit 1)
Deviation from linear phase (DLP): +3.5/-0 ° (20Hz to 20kHz, -20dBu, test circuit 1)
Distortion (THD): 0.065 % (20Hz, -20dBu, test circuit 1)
Maximum 20Hz input level: -2.5 dBu (1% THD, test circuit 1)
Common-mode Rejection Ratio (CMRR) 150ohms Balanced Source: 110 dB (60Hz, test circuit 2)
Output Impedance: 17 kohms (1kHz, test circuit 1)
Primary DC resistances: 19.7 ohms
Secondary DC resistances: 2465 ohms
Capacitances at 1kHz: 205 pF (secondary to shield and case)
Turns Ratio: 1:10.0
Breakdown Voltage: 250 Vrms (primary or secondary to shield and case, 60Hz, 1 minute test duration)