| 1. | After 1976, the plate voltages were lowered slightly for improved reliability.
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| 2. | I doubt that it used a very high plate voltage.
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| 3. | Areas with 220 240 volt AC supplies could develop higher plate voltage with a simple rectifier.
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| 4. | Like most A . F . amplifiers in radios, the plate voltage is usually less than 60 volts.
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| 5. | Some tube will provide some amplification down to 22 volts of plate voltage, though the amplification may be low.
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| 6. | A tube with an unusually high level of internal gas may exhibit a visible blue glow when plate voltage is applied.
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| 7. | When a tetrode or pentode is used, the screen grid voltage is usually about one-half the plate voltage.
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| 8. | The "'866 "'is a filament preheated for at least 30 seconds before applying the plate voltage.
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| 9. | This is grounded at the operating frequency, but carries a DC potential, normally 10 to 50 % of the plate voltage.
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| 10. | Tube caps were also used for the plate ( anode ) connection, particularly in transmitting tubes and tubes using a very high plate voltage.
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