| 摘要 |
<p>The thermionic valve tester (10) has a casing (11) and three valve sockets (12) each of which is adapted to receive and has terminals for connection with the electrode pins of different types of thermionic valves. The thermionic valve tester (10) also has a display (13) comprising a series of LED lights, three user operated buttons (16), and a single power supply socket or terminal (14) which supplies power to all components of the valve tester and which is adapted for connection to a low voltage DC power supply lead. Internally, the thermionic valve tester (10) has a plurality of voltage regulators each with a switchable connection to at least one valve electrode terminal of the valve sockets (12) and a memory in which is stored the tests and the performance criteria for different types of thermionic valves. A controller controls connection of the voltage regulators with the terminals of the valve sockets (12) and the voltages applied to the terminals and also monitors current flow in the thermionic valve during testing. The thermionic valve tester is a small, portable unit which is simple and easy to use and enables people, other than qualified specialists and audio technicians, to regularly monitor valve performance.</p> |
