9.&e. VALVES VHF/UHF TRIODE A1714 ISSUE 4 A triode with planar electrodes for use as an RF oscillator at frequencies up to 1000 Mc/s or as a low noise amplifier at frequencies up to about 300 Mc/s. The A1714 is a commercial equivalent of CV408. In many applications the A1714 may be replaced by the A2975 with improved performance. BASE CONNECTIONS AND VALVE DIMENSIONS h h IC Base: B7G Bulb: Tubular Max. overall length: k IC Max. seated length: Max. diameter: ga View from underside of base 54.