300B triode SE at 400V/80mA/5kOhm. Theoretical second and third harmonic levels (F2, F3) per WE 1939 datasheet and actual distortion %% in an SV300B SET running at around the same operating point.
<a href="//commons.wikimedia.org/w/index.php?title=User:Retired_electrician&amp;action=edit&amp;redlink=1" class="new" title="User:Retired electrician (page does not exist)">Retired electrician</a>
<p><span class="int-own-work" lang="en">Own work</span> based on:
</p>
<ul><li>theoretical lines - per WE 1939 datasheet <a rel="nofollow" class="external free" href="http://www.tubebooks.org/tubedata/we300a_b.pdf">http://www.tubebooks.org/tubedata/we300a_b.pdf</a></li>
<li>actuals for the SV300B ams - Satoru Kobayashi (2000). SV 300B Stereo Amp Using Plitron Transformers // Glass Audio, 2000 Vol. 12, № 6. p.20 figure 14 <a rel="nofollow" class="external free" href="http://www.plitron.com/wp-content/uploads/2010/04/GLASSkoby.pdf">http://www.plitron.com/wp-content/uploads/2010/04/GLASSkoby.pdf</a></li></ul>