#AUDIOPHILE LEVEL #RIAA Onkyo P-303 ULTIMATE STEREO PREAMPLIFIER
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Onkyo Integra No-frills P-303 Stereo Preamplifier
Another feature of this no-frills preamp was that it used Mu-metal as an RF/EMI shield ver the entire top of the preamp and the bottom of the phono-stage. Mu-metal is expensive and used by the big boys (like NASA) to improve the noise floor in highly sensitive scientific instruments and shield them from stray interference. With a sweet all-wood cabinet and a single-supply but dual-mono layout, this preamp made waves.
P-303 Exotic Mu-metal Shielding
Its shortcoming was that it only selected two high-level inputs, a tape loop, and MC or MM phono cartridge (yes, it did have a similar circuit topology for the additional gain stage of the MC pre-preamp).
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