Electro-Voice TK-150 - 70/100 V Transformer Kit

The TK-150 is designed to be used with a 50 Hz Butterworth 24 dB/octave active high-pass filter inserted in the signal chain at the input to the driving amplifier. This filter protects the amplifier from damage caused by transformer saturation at low frequencies and allows any number of transformers to be driven on the same line, up to the rated power of the amplifier. Following the parameters below, the TK-150 is capable of delivering up to 300 Watts to the loudspeaker by connecting a 100V drive line to the tap labeled "DO NOT USE" (150W at 70.7V) if a Butterworth 24 dB/octave active high-pass filter tuned to 66 Hz or higher is inserted in the signal chain at the input to the driving amplifier.