Monday, November 30, 2009
MM Phono Preamp-Battery powered
Mongrel Dog Audio produces MM phono preamps. These preamps are based on the Jaycar MM kit which has since been discontinued in 2009. The basic OP amps in the kit are upgraded to Burr-Brown OPA2134 types and the cheap chip sockets replaced with mil spec versions.
Silver wire and gold RCAs compliment a quality build. The resonance free and non-magnetic plastic enclosure is lined top and bottom with bitumanised Al foil. The original kit was designed to work with an external AC plug pack. The circuit has been modified to be battery powered.
Three 9V lithium batteries provide a silent power source to ensure no hum or PS noise is passed to the rest of the system. This two stage MM phono preamp gives excellent performance for its low price and simple construction.