Offered for sale: a set of Sphinx Project Twelve Mono power amplifiers, made by Siltech Holland. Both amplifiers are in neat, well working condition. Both mono power amplifiers have been revised, so they can last for years again (photo of old parts included, see photos). The outside of both amplifiers have some small signs of wear here and there, but nothing noteworthy. (see the photos); The photos are part of the description. Connoisseurs know what these mono power amplifiers can do. This set includes the manuals and an original advertising flyer/poster (see photos). Both amplifiers will be packed very well and sent by insured mail. Specifications Sphinx Project Twelve Output power: 151 watt in 8Ω (mono) Frequency range: 20Hz to 20kHz Total harmonic distortion: 0,006% Damping factor: 155 Input sensitivity: 1.25v Signal-to-noise ratio: 120dB Impedance speaker load: 2Ω (minimum) Dimensions: 250 x 68 x 340 mm Weight: 6.5 kg