| 31. | In an ECO, The screen grid acts as a plate for the triode oscillator.
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| 32. | Before 1915, triode vacuum tubes were spherical or shaped like an incandescent light bulb.
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| 33. | The triode, however, was a fragile device that consumed a substantial amount of power.
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| 34. | This particular example uses six triodes.
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| 35. | This eliminated the need for a preamplifier triode in radios, making them cheaper to produce.
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| 36. | The first product produced under the trade mark " Eimac " was the 150T power triode.
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| 37. | This was driven by a pair of type 4015-A triode valves cooled by air.
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| 38. | Lee de Forest placed a screen, added a " grid " electrode, creating the triode.
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| 39. | The electronics revolution of the 20th century arguably began with the invention of the triode vacuum tube.
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| 40. | Impedance of 1000 to 2000 ohms was common, which suited both crystal sets and triode receivers.
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