 1926 Siemens BO Triode: Consider the durable interior construction. Vibration-proof for film sound amplifiers.
Click Here for large photo of elements.
|
 1926 RT (France) R41 triode: Again a mirror effect from the getter. This time from S-piston-execution (TS). |
 1927 Philips A.B. triode: Small transmission triode for short wave amateur transmitters. Achieves approx. 5 Watts |
 1927 unknown French S??M triode: Many radio amateurs require tubes with the elements mounted vertically matter. The industry follows this desire. |
 1927 Radiofotos Grammont (France) E6 triode: The ancestor to the previous tube (above far right). The elements are arranged horizontally for more stability. Click here for close up photo of the two tube's elements. |
 1927 SIF GO10 triode: 10 Watt transmission triode |
 1927 Telefunken RS5 triode: Telefunken brings an amazingly low-priced KW transmitter tube to market for amateurs . Only anode has top connection. |
 1928 Cyrnos 78-4 "Tri-Grid": Despite the failure of the double grid tube a triple grid is developed. Doesn't market well. |
 1935 Philips TC 1-40 triode: This low-priced KW transmission triode of approx. 15 Watts is not accepted in the market due to it's socket footprint. |
 1935 SIF A4-5 triode: A transmission triode very much liked. With 75 W transmitting power up to 60 MHz but was too expensive for amateurs! Click Here for another view. |
 1925 SIF GOT-100 high frequency amplifier Pentode |
 1925 SIF TM150 amateur send triode
Click Here for large photo of elements. |
 1925 Mazda Radio (France) triode amplifier tube for low frequency used in sports public address systems. |
 1930 unknown England amateur end triode: Grid has side connection, anode on top. No further data available.
Click Here for large close up of lower half. |
 1931 SFR P75 Transmitting Pentode; 150 Watt |
 1936 SFR EG75 amateur transmission triode: 120-200 Watt |
 1940 RCA 803 Pentode: New characteristic: Anode from graphite! With the next three radio tubes the suppressor grid was no longer connected to the cathode, but led out on a pin. (TS) |
 1940 Tungsram Hungary OS 41-250 Pentode: This permitted a very simple modulation: The high impedance side of a microphone Transformer was put between the suppressor grid and the cathode. |
 1940 Tungsram Hungary OS 125-2000 Pentode: To build crystal transmitter into Telephone. Not well received in market. |
 1941 RCA national union 807 Beam power tube: Successor of the 6L6G. explanation Beam power principle on 5.6 of the introduction. A liked cheap radio tube. |
 RCA USA 828 Beam Power Tube |
 GE USA 813 Beam Power Tube |
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