RP5.1 discontinued

The great pleasure of the vacuum tube taste joined to the high dynamics and punch feeling of solid state.

The input stage uses two double triodes while the output is a pure A-Class current stage employing bipolar power transistors. This hybrid technology makes possible a direct output without transformer, offering all the natural sound of the tube stage without the slow sound typical of many classic OTL tube amplifiers — RudiStor calls this technology E-OTL (Enhanced Output Transformer-Less).

The power supply is completely oversized, using the classic RC cells and Capacitance Multipliers to give the purest DC to the audio stage. Components are hand-matched from the best batches, each individually tested before populating the boards.

Thanks to the exclusive IHC (Induced Harmonic Compensation) technique, harmonic distortion is reduced to a mere 0.2% at normal listening levels, with a dominant 2nd harmonic and no high-order harmonics. IMD is negligible.

The RP5.1 drives both high and low impedance headphones (24 to 600 Ohm). New 10 mm CNC-worked aluminium faceplate, heavy aluminium case, silver internal wiring, lead-free components and tin/silver solder.

Specifications: max output 500 mW; bandwidth 2-50,000 Hz (<1 dB); gain adjustable 0-15 dB; input impedance 47 kOhm; zero negative feedback; always Class A; weight 6 kg; dimensions 23 x 8 x 28 cm.

Price at the time: Euro 700.00, worldwide shipment included. Reviewed on SoundStage (September 2005).