This tube was originally listed as DFP_Frelat, sourced from Taschenbuch zum Rohren-Codex, 1948/49. this would appear to be an error as the DEP (Frelat) is listed in this as well as Rohrencodex, Rohren-Taschenbuch 1950:23000 tubes and British Radio Valves: The Classic Years 1926 - 1946.
Literatur
British Radio Valves - The Classic Years: 1926-1946 P. 262 and sauplement p. 40.
Röhrencodex , Röhren-Taschenbuch 1950 23000 Röhren
Taschenbuch zum Röhren-Codex 1948/49
