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Definition of "Hard Vacuum Tubes" |
Hard vacuum tubes; early diodes and triodes performed as such despite a rather high residual gas pressure. Techniques to produce and maintain better vacua in tubes were then developed. Historically, vacuum levels in production vacuum tubes typically ranged from 10 µPa down to 10 nPa. / The variation of carrier frequency is known as the frequency deviation, and for very-high-frequency broadcasting it can reach ± 75 kilohertz. The greater the frequency deviation the greater is the effective modulation. |
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