Electron Tube Collection and Four Rare Special Tubes1) Zenith RTS4, tetrode, Italy, 1941, four-pin European base. - 2) SFR E140, transmitter tube (triode), France, c. 1938, four-pin European base. - 3) Siemens STEM 5000 5/15, no. 6202, Thyratron, Germany, 1935, special base and top connection, height 10 in. - 4) Fivre 5C110, end pentode, Italy, c. 1938, P35 base. - 5) Elektromekano M7, triode, Denmark, c. 1938, four-pin European base. - 6) AEG S1/3ill, thyratron, Germany, 1940, with large-area cathode according to Hull, helium gas filling, on height-proof tube base. - 7) WF S1/0,2illE, thyratron, GDR, c. 1950, five-pin base. - 8) Tungsram OS 51, pentode, Hungary, c. 1950. - 9) 2 x Telefunken LD5, transmitting triodes of the German Wehrmacht. - 10) 2 x TeKaDe RL12T15, transmitting triodes of the German Wehrmacht. - 11) Telefunken RL2T3, triode. - 12) 2 x Telefunken LG2, dual diodes of the German Wehrmacht. - 13) Telefunken LG4, dual diode of the German Wehrmacht. - 14) Telefunken LG1, dual diode of the German Wehrmacht, with base. - 15) Valvo RL12T2, triode. - 16) Telefunken RL2P3, transmitting pentode. - 17) Valvo LG6, two-way rectifier. - 18) Telefunken LD2, triode of the German Wehrmacht. - 19) Telefunken NF2, vacuum pentode, mint in box. - 20) Three Telefunken magnetron tubes, RD4Ma, RD2Me and RD2Md, together on presentation base. - And: 21) Decimetre transmitter from the Deutsche Funkmesstechnik, c. 1940, educational model. - And: Four rare special electron tubes: 1) Telefunken Magnetron RD2 Md2, c. 1935, six-slot anode with thorium segment, made especially for the German Wehrmacht, used in radars with cryptic designations as "Schornsteinfeger", "Berlin", "Rotterdam", "Korfu", "Renner", "Segler", "Barbara", "Niendorf", "Euklid", "Panorama Z" and "Kornax". - 2) Loewe Opta 2 HMD, c. 1932, double tetrode (mixing tube), with base. - 3) Telefunken ACH 1, c. 1934, hexode-triode (mixing tube), with base. - And: 4) Westinghouse VT 17, 1924 onwards, USA, air-cooled transmitting tetrode.Sammlung Elektronenröhren und 4 seltene Spezialröhren1) Zenith RTS4, Tetrode, Italien, 1941, Vierstift-Europasockel. - 2) SFR E140, Senderöhre (Triode), Frankreich, um 1938, Vierstift-Europasockel. - 3) Siemens STEM 5000 5/15, Nr. 6202, Thyratron, Deutschland, 1935, Spezialsockel und Obenanschluß, Höhe 25 cm. - 4) Fivre 5C110, Endpentode, Italien, um 1938, P35-Sockel. - 5) Elektromekano M7, Triode, Dänemark, um 1938, Vierstift-Europasockel. - 6) AEG S1/3ill, Thyratron, Deutschland, 1940, mit Großflächenkathode nach Hull, Heliumgasfüllung, auf höhenfestem Röhrensockel. - 7) WF S1/0,2illE, Thyratron, DDR, um 1950, 5-Stift-Sockel. - 8) Tungsram OS 51, Pentode, Ungarn, um 1950. - 9) 2 x Telefunken LD5, Sende-Trioden der deutschen Wehrmacht. - 10) 2 x TeKaDe RL12T15, Sende-Trioden der deutschen Wehrmacht. - 11) Telefunken RL2T3, Triode. - 12) 2 x Telefunken LG2, Zweifachdioden der deutschen Wehrmacht. - 13) Telefunken LG4, Zweifachdiode der deutschen Wehrma