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| APPLICATION Exceptionally high 20 Hz level, high bandwidth 200 ohm microphone transformer. Suitable as replacement for original transformer in many vintage recording studio units. 100% geometric balance relative to the secondary centre tap ensures near perfect phase splitting for use with balanced amplifiers. | |||||||||
| FEATURES Unusually large Mumetal laminated core for minimal distortion and even at very high levels. Two chamber bobbin provides full geometric balance and 4 internal electrostatic shields for the ultimate in noise rejection and phase splitting performance. The primary windings may be used in parallel for increased voltage ratio when used with 50 ohm microphones. Heavy Mumetal screening can to ensure immunity from hum fields. Phantom powering may be supplied in the 1:5 configuration using the primary center tap (Yellow + Grey). A damping network of 45k0 ohms in series with 25 pF across the secondary may be used depending on the input capacitance of the amplifier. | |||||||||
| Primary configuration | Series | Parallel | |||||||
| Voltage ratio | 1CT:5CT | 1:10CT | |||||||
| Bandwidth (-0.5 dB points, typical) | 10 Hz to 60 kHz | 10 Hz to 55 kHz | |||||||
| Total DC resistance ref. primary | 48 ohms | 12.5 ohms | |||||||
| Max. input level at 20 Hz | +10 dBu | +4 dBu | |||||||
| Total harmonic distortion | 0.002% at 1kHz | 0.002% at 1kHz | |||||||
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FREQUENCY RESPONSE measured using 200 ohm source and 25k0 ohm load and a damping network of 45k0 ohms in series with 25 pF. | ||||||||
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PHASE RESPONSE measured using 200 ohm source and 25k0 ohm load | ||||||||
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INPUT IMPEDANCE measured with 25k0 ohm load | ||||||||
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TOTAL HARMONIC DISTORTION measured with 40 ohm source and 25k0 ohm load. Input Level +10 dBu. | ||||||||
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