| 摘要 |
In accordance with the invention, improved vacuum microtube devices are provided with arrangements for tunably spacing the gate and the cathode. Tuning can be effected by using an electrostatic or magnetic actuator to move the gate on a spring or a rail. Advantageously a feedback arrangement can be used to control the spacing. Magnetic reassembly components can be provided for facilitating release of tube components in fabrication.
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