J .A. Coomes & Co. Ltd.
2 & 4, East Avenue, Manor Park, London, E12 (1922)
41 New Oxford Street, London WC. (1922)
Showrooms: 5, Holborn Viaduct, London, E.C. (1923)
Works: Connaught Road, Ilford, Essex. (1923)

Brand: Ionophone

Manufacturer of radio components, Ionophone brand crystal sets, and receivers from circa 1922.

They advertised in British radio magazines until the mid-1920s.

Examples of their products were displayed at two radio exhibitions as detailed below.

All-British Wireless Exhibition and Convention at the Horticultural Hall, Vincent Square, Westminster, September 30th - October 7th.

An interesting feature at the exhibition of wireless apparatus at the Horticultural Hall will be a new Broadcasting Receiver called " The IONOPHONE."

The IONOPHONE is designed and manufactured by Messrs. J. A. Coomes & Co., Ltd., Manor Park, E12, who have recently opened a wireless department at their works and have added to their directorate several gentlemen well-known in wireless circles, who have been engaged in radio research work for many years and who possess unrivaled experience in the design and production of wireless apparatus.

The set contains two Radio frequency amplifying valves and one Rectifying valve, low resistance phones, HT and Batteries, Aerial Wire, etc., all complete and ready for erection, valves alone excepted.

For the amplification of very weak signals and where especially loud effects are required, as for dances, concerts, etc., a Second Stage Two-Valve Audio-frequency Amplifier is supplied for attachment to the above set. The range of the instrument enables the user to get The Hague concerts, the Eiffel Tower meteorological reports and Time Signals as well as all the ordinary broadcasting.

Messrs. Coomes also manufactures Radio  frequency, Audio-frequency, and Telephone Transformers, Variometer, and a Loud Speaking Telephone Adaptor. [1]

Ideal Home Exhibition, Olympia., March 1923

J. A. Coomes & Co., Ltd. Exhibits at Stand 25 include a complete range of our famous Ionophone Variometer Tuned Broadcasting Sets.

• Five-valve set, consisting of 2 HF valves, 1 detector, and 2 LF valves.
• Three-valve set, consisting of 1 HF, 1 detector, and 1 LF.
• Two-valve set, consisting of 1 HF and 1 detector

(All above sets have a wavelength   range from 300 – 3,000 metres.) 

• Loudspeaker Adaptor, consisting of an ebonite horn with a phone attachment.
• AC Battery Charger. A new device enabling small batteries to be charged directly from AC mains of ordinary voltages and any frequency up to currents of 2 amps., especially suited for LT wireless batteries. [2]

[1] Popular Wireless Weekly Sep 30, 1922, Page 356.
[2] Popular Wireless Weekly Mar 17, 1923, Page 115.