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009 Stern Mullard Mixer, Valve Mic Pre-Amplifier EF86 Pentode

This is a detailed look at a 4 channel valve audio mixing unit, which uses EF86 screened pentode valves for the mic amp stage and an ECC83 valve for the radio and crystal pickup inputs.

Our service technician gives you a good look at the unit and takes you through the circuit diagram.

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