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In Reply to: Is this still a problem with ultra linear tube amplifiers? posted by Vic D on July 7, 2012 at 20:49:29:
UL comes to us from a patent in the 1950s. The original patent called for a very specific point on the transformer for the screen tap. If done that way you got the linearity of a triode with about 90% of the pentode power.
Other companies wanted this but did not pay the original patent holder, and got around the patent by changing the point of the tap. This had consequences, not the least of which was the triode linearity suffered.
The point of this is not all UL are the same. Do they use the correct tap point? For example, Dynaco never did.
What Stu says is true (the reliability issue had nothing to do with it being UL, BTW), but it makes a difference how hard you push the amp. If you don't drive it hard the load sensitivity does not manifest. However tube power is expensive so as audiophiles we tend to buy amps that have 'enough' power and then try to use every drop.
Its for this reason I have always preferred triodes. True, they are more expensive but due to the distortion characteristics they have a greater amount of 'usable' power. IOW you can push them harder before they get unpleasant.
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Follow Ups
- A point about ultra linear - Ralph 09:08:54 07/08/12 (2)
- RE: A point about ultra linear - Vic D 11:12:35 07/08/12 (1)
- RE: A point about ultra linear - Ralph 07:10:33 07/09/12 (0)
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