Antique radios, Old Time Radios
Round_Type-C
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| Tube type: |
Gas Triode Detector |
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<1925 very rare. *** |
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| Identical to |
Round_Type-C
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| Similar
Tubes |
Other base:
2V-P1f
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| First year |
1913
History of the British Radio Valve to 1940 Thrower page 32
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Successor Tubes
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Round_Type-N
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| Base |
Swan-Bajonett B22=22 mm
2 Sidecontacts.
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| Was used by |
Radio/TV-reception etc. |
| Filament |
If 2.5 Ampere / Direct / Battery = |
| Description |
Towards the end of 1911, Harold J. Round of the Marconi Company designed diode valves but suspended his work until November 1912 when he also did some work on triodes. The first successful soft valves of Round were produced in 1913. The valve was probably influenced by the soft valve of von Lieben, Reisz and Strauss since there were some agreements between Marconi and Telefunken at that time. Type C was also used for a r.f. amplifier in direction finding equipment which went into service in 1914. This tube was madewith either E27 or B22 base. The grid and anode connections were from wire leads on the sideof the bulb.
Text in other
languages (may
differ)
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Dimensions (WHD)
incl. pins / tip |
x x 51 mm / x x 2.01 inch |
| Information source |
British Radio Valves - The Vintage Years: 1904-1925 pages 17 & 19
Saga of the Vacuum Tube, Tyne pages 207 & 208
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Just Qvigstad
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Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):1
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