| 21. | Pentodes are made in two classes : those with the suppressor grid wired internally to the cathode ( e . g.
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| 22. | Each stage used a Class B amplifier arrangement of EF8s, special low noise, " aligned-grid " pentodes.
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| 23. | When a tetrode or pentode is used, the screen grid voltage is usually about one-half the plate voltage.
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| 24. | A further bonus was that third harmonic distortion was much reduced relative to a comparable pentode ( Terman pp 198 9 ).
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| 25. | The beam tetrode design was also undertaken to avoid the patents which the giant Philips firm held on power pentodes in Europe.
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| 26. | After World War II, pentodes were widely used in TV receivers, particularly the successor to the EF50, the EF80.
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| 27. | Pentodes of the same power dissipation are capable of higher output power than triodes, but distortion is higher and more objectionable.
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| 28. | The vacuum tube is then known as a triode, tetrode, pentode, etc ., depending on the number of grids.
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| 29. | Pentode tubes used in this circuit have a negative transconductance of only around-250 microsiemens, giving a negative resistance of-4000?.
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| 30. | Later tetrodes and pentodes such as 817 and ( direct heated ) 813 were also used in large numbers in ( especially military ) radio transmitters
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