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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: A dumb Q about pentode output impedance posted by SomeJoe on October 20, 2006 at 09:36:10:
A triode can handle a wide range of load and still be okay. A pentode can't really. The best load for the pentode crosses just below the knee of the tube curves.Also consider that a triode would be happy with constant current loading and a horizontal load line. A pentode would not like that at all. The pentode however could do okay with a vertical load line and constant voltage. They really are very different parts despite both being tubes.
In most normal operating ranges a pentode does indeed require feedback. But if you were willing to settle for much less power non-standard loading could prove workable without feedback. Along the line of a current drive amp using the tube at lower voltages and very high currents a small linear portion can be had but only a few watts.
Russ
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Follow Ups
- Perhaps not the answer you are looking for - Russ57 10:30:13 10/20/06 (6)
- Re: Perhaps not the answer you are looking for - John Swenson 17:24:47 10/20/06 (4)
- Better linearity than triode-wired? - SomeJoe 23:08:23 10/20/06 (0)
- 2 questions - Russ57 18:06:22 10/20/06 (2)
- Re: 2 questions - sser2 14:30:10 10/22/06 (0)
- Re: 2 questions - Dave Cigna 14:28:48 10/21/06 (0)
- Exactly! (nt) - Ray Moth 15:54:44 10/20/06 (0)
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