Three varieties of Harmonic Percolator from Fredric Effects (http://www.fredric.co.uk/effects)
Black: As blue, with Wima audio-grade capacitors, precision metal film resistors, switchable noise reduction circuit
Blue: Vintage correct NOS 2N404(A) & 2N3565 transistors, 1N695 Germanium diodes
Beige: NOS Russian MP16B Ge & standard 2N3904 Si transistors, Russian KD514A silicon diodes
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