Valve [DeForest]
Maker and role
De Forest Radio Company, Manufacturer
Isolantite Manufacturing Co., Inc., Manufacturer
Production date
Circa 1924
See full details
Object detail
Accession number
1978.1692
Production period
Description
DeForest DV2 Audion valve.
Cylindrical shaped valve with pointed tip, metallic tinted glass. A sticker with "DEFOREST / 5 VOLT. AUDION / DV2 / TESTED / BY DEALER / DATE / In presence / of / Purchaser" printed on it is adhered to the glass of the valve. The valve has a white ceramic base with four short pins. On the side of the base, "ISOLANTITE / BASES / MFG / FOR / EXCL / de forest / AUDION / TRADE MARK / PAT. 1-15-07 / 12-18-08 : 12-20-10 / 6-3-19 - 5-1-23 / SOLD ONLY / FOR AMATEUR AND / EXPERIMENTAL / USE" is printed in black. At the bottom of the base, "11195" is printed.
Cylindrical shaped valve with pointed tip, metallic tinted glass. A sticker with "DEFOREST / 5 VOLT. AUDION / DV2 / TESTED / BY DEALER / DATE / In presence / of / Purchaser" printed on it is adhered to the glass of the valve. The valve has a white ceramic base with four short pins. On the side of the base, "ISOLANTITE / BASES / MFG / FOR / EXCL / de forest / AUDION / TRADE MARK / PAT. 1-15-07 / 12-18-08 : 12-20-10 / 6-3-19 - 5-1-23 / SOLD ONLY / FOR AMATEUR AND / EXPERIMENTAL / USE" is printed in black. At the bottom of the base, "11195" is printed.
Brief History
In 1906 American electrical engineer Lee de Forest invented the Audion diode. It was a development on the Fleming valve, both of which acted as radio detectors. DeForest later made improvements to the Audion thus creating the world's first triode in 1908. It was a major development in electronic and radio technology as it was the first electronic amplifier able to amplify incoming radio wave signals.
This DV-2 Audion has a ceramic ‘Isolantite’ base which dates it to around the time of the De Forest company’s reorganisation to the De Forest Radio Company in 1924.
This DV-2 Audion has a ceramic ‘Isolantite’ base which dates it to around the time of the De Forest company’s reorganisation to the De Forest Radio Company in 1924.
Marks
DEFOREST / 5 VOLT. AUDION / DV2 / TESTED / BY DEALER / DATE / In presence / of / Purchaser Printed
ISOLANTITE / BASES / MFG / FOR / EXCL / de forest / AUDION / TRADE MARK / PAT. 1-15-07 / 12-18-08 : 12-20-10 / 6-3-19 - 5-1-23 / SOLD ONLY / FOR AMATEUR AND / EXPERIMENTAL / USE" Maker's Mark
11195 Printed
ISOLANTITE / BASES / MFG / FOR / EXCL / de forest / AUDION / TRADE MARK / PAT. 1-15-07 / 12-18-08 : 12-20-10 / 6-3-19 - 5-1-23 / SOLD ONLY / FOR AMATEUR AND / EXPERIMENTAL / USE" Maker's Mark
11195 Printed
Credit Line
De Forest Radio Company et al. Circa 1924. Valve [DeForest], 1978.1692. The Museum of Transport and Technology (MOTAT).
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