BARR & STROUD VARIABLE FILTER TYPE EF-3 Effects Pedal a step-up transformer is required

a step-up transformer is required for use in North America

It's just been serviced by James Walker at Synth Repair Services - he's cleaned the pots

It has a few very minor scuffs and scratches but is in good order for a unit that's around 30 years old - there's some tape residue to the sides and underside of the case which aren't visible when racked (see detailed photos below)

This is a great creative machine - but not for you if you want perfect clean echoes

we advise that it's a wise move to fit a modern driver in these old amps: it depends on what you want to use it for

BARR & STROUD VARIABLE FILTER TYPE EF-3 Effects Pedal a step-up transformer is requiredOffered for sale is this Barr & Stroud Variable Filter EF 3 in excellent cosmetic condition and good working order (see photos for details). This is an extremely high spec dual filter unit as used by the BBC and various labs around the world: it offers very precise filtering. It requires BNC connectors adaptors for audio use. These units are famed for their high build quality and are designed for use in forensic audio they have also gained a following