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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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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: Does single ended have less odd harmonics than PP? posted by violinist3 on March 16, 2007 at 14:13:58:
A tube will create harmonics due to its own characteristice and the conditions under which it is used. That will happen whether the topology is single-ended or push-pull. Pentodes produce more of the higher order harmonics than triodes.A push-pull arrangement tends to cancel out the even harmonics (to an extent that depends on the exactness of the PP balance), but the odd harmonics remain and, without the 'sweetener' of the even harmonics, can be unpleasant to the ear.
With a single-ended arrangement, harmonics are there in all their glory and the only way of reducing them is with negative feedback. However, NFB is difficult to apply to any great extent in an SE amplifier, so the less distortion there is to start with, the better. That's one reason SE triode, especially the very linear directly-heated triode, is preferred to SE pentode. Another reason is that pentodes have much higher output impedance than triodes and, without copious NFB, will cause the damping factor to be too low for most speakers.
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Follow Ups
- Re: Does single ended have less odd harmonics than PP? - Ray Moth 16:21:45 03/16/07 (2)
- Re: Does single ended have less odd harmonics than PP? - Michael Samra 19:46:54 03/16/07 (1)
- Re: Does single ended have less odd harmonics than PP? - Ray Moth 13:54:00 03/17/07 (0)
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