Switching Power - dexicon.co.th == Sound Systems & Audio Parts. Electronics vendors. Home Theater Guide by Too' Ninja. DIY Tech. AHT Research - All Hi-End Technology. Antique Radios, 120 000 Antique Radios on display. The Philips Red valves series, part III. As a quirk of history it happened that one part of the Red valves series was common to two different areas at two different times: Firstly in many countries of Europe, but not in the German Reich where they were prevented by the Telefunken monopoly, - then later, after they were virtually obsolete everywhere else, from 1947 to approximately 1950 in the West zones of the former German Reich, which became the "Federal Republic of Germany" in 1949.
The Philips all-glass Loctal valve series (ECH21, EBL21) had come out in 1941 and from 1947, the first Rimlock (B8A) valves from Philips in the Netherlands. However because of the post-war situation, Valvo was unable to manufacture any more-modern valves than side-contact ones, made with the conventional pinch technique. Instead of in red though, they appeared with a gold-coloured coating. After large numbers of these valves had been supplied and had become familiar and proven, they appeared later, and as replacements, in red again.