Goodmans Midax Horns, Celestion "Series 90" Horns

When JMI Vox discovered that the circuitry for their Vox AC-50 and AC-100 amplifier heads was lacking in treble response, they added the Goodmans Midax horn to the matching AC-50 and AC-100 speaker enclosures to compensate for this high frequency deficiency. In America, Thomas Organ, the US manufacturer of Vox amps, designed the Royal Guardsman and Super Beatle amplifiers in 1966 as replacements for the UK made AC-50 and AC-100. Thomas also added the Goodmans Midax horn to the speaker cabs for these amps, despite an abundance of treble in their new solid state circuitry.
In 1969, Thomas Organ replaced the Royal Guardsman and Super Beatle amps with the "Series 90" models. The new Series 90 amps no longer utilized the Goodmans Midax horn. A new, shorter horn was sourced from a UK supplier, probably Celestion. Despite the difference in depth, the Series 90 horn had exactly the same screw mounting pattern as the Goodmans Midax horn. A 4uf oil filled capacitor, wired in series with the horn, acted as a 2000 hz 6db/oct crossover.

Unlike the earlier amps, the Series 90 horn was not concealed behind the grill cloth. A exposed plastic multi-cellular grill was mounted in front of the horn (see below).


The VOX Showroom!

Photos and editorial content courtesy Gary Hahlbeck, North Coast Music

Any and all material presented herein is protected by Copyright.
© 1998 - 2024 The Vox Showroom and North Coast Music, all rights reserved

The images and editorial content in this web site may not be copied or reproduced
in online auction sites such as eBay, Reverb and Craig's List. Sellers may provide a link
to the Vox Showroom web site if they wish to refer to this copyrighted material.