The Jennings Univox J5
Early speakers
An early Jennings Univox J5 with twin 10" Goodmans speakers, the initial arrangement. Early adverts for the model can be found on this page. The example in view dates from mid 1952, i.e. shortly before the revisions introduced by Derek Underdown, who had been brought in by Tom in June to sort out difficulties that had arisen in the course of production.
Thanks to Martin for the pictures.
Below, Late 1940s or very early 1950s, a loose-leaf Goodmans dealer catalogue, the pages in view being for its 10 inch speaker. Typically many Goodmans speakers had no trade or range name. Designation was by frame type / cone type / impedance. Most users will have gone for the 3 or 15 ohm versions.
By the time of the Univox J5, frame and magnet drum had been redesigned (though the format was still known as the "T6"). Later cones were numbered 1028 and 1030. It may be that the 1010 was still available too however.
An overview page on the various types of Goodmans used by Jennings in its console organs can be found here. Derek Underdown's drawing for the massive array accompanying the Model G is on this page.
Many early Goodmans speakers made provision for the mounting of a transformer on the frame.
The required positions of mounting holes / screws on the speaker cabinet baffle.