EMG Mark X C.1929

1929 saw E.M.G move to Grape St, W.C.2. With the need to come up with a longer acoustic length the now acclaimed question mark shaped horn was introduced in March 1929.

According to Joe Ginn, Michael Ginn and David Phillips came up with the shape and Balfour Davey worked on the mathematics to create the Davey Isophonic Horn. The Mk X also introduced the new E.M.G Long Bar 4-spring soundbox which was quickly replaced by the EMG 4-spring in brass and later still the nickeled 4-spring.

The first picture is from the Western Australia Museum and shows a sagging 26/27” Mk X horn, very few have survived.
The second picture is from The Gramophone magazine May 1930 and shows a Mk X with the horn mounted on the left of the cabinet with the lid removed.

The featured example of the Mk X is courtesy of Dominic Combe, (pictures kindly forwarded by Graham Rankin). Note the wooden dust cover for when the horn is removed.

The pictures of the broken Mk X horn are courtesy of Graham Rankin and show the inadequate bronze support.

YouTube video of Mk X with Xa horn.