EFK 12022 Electronic Thermostat
EFK 2001 Mini Pre-Amplifier
EFK 2002 Guitar Pre-Amp Tone Control
EFK 2003 Two Transistor Pre-Amplifier
EFK 2004 Three Transistor Pre-Amplifier
EFK 2005 Super Snooper Utility Pre-Amp
EFK 2006 Graphic Equalizer
EFK 2007 4 Input Microphone Mixer
EFK 2013 High Gain Mic Pre-Amp
EFK 2014 Tone Control
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