High Efficiency Speaker Asylum: RE: If the impedance is benign by 91derlust Need speakers that can rock with just one watt? You found da place.

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Posted by 91derlust (A ) on November 6, 2021 at 16:08:46

In Reply to: RE: If the impedance is benign posted by Retsel on November 5, 2021 at 14:45:35:

When thinking through power and gain for a system design, I aim to keep the H2 distortion if the output tube at <2%, even on peaks when playing at levels I think are loud. For my current design/build, the DHT gain stage/s should contribute little distortion. Most of the time I will be listening well below loud levels anyway.

A quick look at the WE300B gives plenty of operating points with their calculated H2 and H3 distortion. 10% H2 distortion points for a 300B SET at full power should be easily avoidable.

I also like running highish loads on tubes - I'm happy drop 10% to 20% at full power to reduce distortion by roughly 40% to 50%... and the gain in damping factor is often nice (though I have speakers designed for SET-like source impedance).

My next amp might be an all-DHT PP amp... Let's get the SET amp that is still at the CAD stage done first. ;)

Take care.

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