Wireless World, July, 1956.

Valves Advertised:

G75/3G, G180/2M, SV-VR150/30, SV-VR105/30, SV-VR90/30, SV-VR75/30, SV-OA2, SV-OB2, G120/1B, G400/1K, G400/2G G50/1G, G150/2D, G240/2D, G1/371K, 4313C & G1/235G.