They can be used in devices for which vacuum tube valves were unsuitable, such as in hearing aids designed to fit into the ear . 它們能用在不宜采用真空管的裝置上,例如能用在放在耳朵內(nèi)的助聽器里。
Tube valves ; screw - on large bore convertible valve 105 內(nèi)胎氣門.大孔的旋接105型氣門
Tube valves ; rubber base type for air - waterfilling 內(nèi)胎的氣門.氣壓充水式橡皮底座氣門
Tubes valves ; rubber base valves 40 . 5 g single - bent 內(nèi)胎氣門.帶橡膠座的40 . 5g單彎氣門
Tube valves ; straight rubber base valve 40 g 內(nèi)胎氣門.帶橡膠座的40g型氣門