What is it?
The Lemon Drop is an overdrive and boost circuit that was designed to mimic the unique overdriven tones of the rare Vox 4&7 series amplifiers in a small and easy to use stompbox. An unknown amp to most, the 4&7 series amps were most famously used by the Beatles during the Revolver era and Jimmy Page on numerous tracks from the second Zep album. Think Paperback Writer style of tones and, yes, Whole Lotta Love.
The Lemon Drop's circuit is based around key design elements of the amp, in particular the hybrid design consisting of a solid state preamp and a tube driver and power amp. The Lemon Drop's design captures the aggressive qualities of the solid state preamp found in the 4&7 series amps by using a pseudo hybrid setup consisting of a specifically selected silicon transistor for the first stage which adds a distinct bite and growl. The input stage of the Lemon Drop is based directly on the input of the amp. That pushes an FET stage into clipping adding some warmth, sustain and amp like dynamics to the tone and feel. The end result is a highly effective emulation of the amp and a unique sonic blend that could be characterized as a "fuzzy overdrive".
The Controls The Lemon Drop features your common three control layout consisting of a volume, drive and tone knob.
The drive knob will go from a cleanish-grit with humbuckers, to a thick distinctive overdriven tone with some qualities of a fuzz circuit. If cleaner tones are desired, simply backing off the guitar's volume knob will clean it right up and still retain it's treble frequencies. If more distortion is needed, the Lemon Drop works great as a boost and will get along just fine with some overdrive from your amp or another pedal.
Electronics and Hardware
Courtesy of Pinstripedclips
Zep II Tones
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A sample of reivews. These and others can be found on various gear forums, including The Gear Page.