Up for sale, a set of 3 original new old stock Bulgin UK made control knobs. These are not exact replacements for vintage Mellotrons as they are 1/8th of an inch smaller than the original 1-1/4" volume and tone knobs used on the M400 but they will fit. However, these are perfect for the digital mellotron models such as the M4000D, M4000D mini, and Micro. They look amazing and give you that vintage feel and vibe. Each knob also comes with a brass sleeve to adapt the original control shaft from knurled to a set screw. These knobs are 1-1/8" in diameter with a set screw for mounting and available in extremely limited quantity. Get them while you can!