As far as I’m aware, Ekco manufactured six round bakelite models. I’m not sure but there might be a seventh model, the A22T manufactured for export. I hope to find some information on that one soon. The innovative round Bakelite cabinets, designed by Wells Coates, were not only popular in their time but remain popular today and are much sought after by collectors. The A22 appears to be the only model which has a short wave band, which is surprising as the short wave bands were very much in use in the early days of radio.
The Ekco AC76 uses British B4, B5 and B7 valves and is a nice radio to work on. As the radio incorporates a mains transformer, the chassis can be earthed. Manufactured from 1935. Long and Medium Wave. Valves – FC4 – AC/VP1 – V914 – AC/2PEN – UU3. AC Supply.
The Ekco AD65. Manufactured from 1934. Long and Medium Wave. Valves – FC13 – VP1321 – PENDD4020 – UR1 or CY1. AC/DC Supply. SERVICE SHEET here
The Ekco AD75 uses octal valves and covers the long and meduim wave bands. Manufactured from 1940. Long and Medium Wave. Valves – CCH35 – EF39 – CBL31 – CY31. AC/DC Supply. SERVICE SHEET here
The Ekco A22 uses octal valves and covers medium, long and short wave. As the radio incorporates a mains transformer, the chassis can be earthed. Manufactured from 1945. Long Medium & Short Wave. Valves – ECH35 – EF39 – EBL31 – AZ31. AC Supply. SERVICE SHEET here