The A1714 is a planar triode designed for high frequency use.The main use was probably VHF television at 45 MHz, which is the same as WWII Radar IF frequencies.The anode dissipation is 2.5 Watts and running an RF amplifier at a moderate current was a way to keep the noise low and the A1714 had a noise equivalent resistance of 550 Ohms. At 45 MHz the input resistance was given as 40,000 Ohms. The maximum anode voltage was 250 Volts.
The Osram brand label indicates a consumer product.The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 46 mm tall.References: Data-sheet. |
