The 300B triode - heater I/V curves for stationary thermal states. Experimental data by Jac van de Walle, 2015 <a rel="nofollow" class="external autonumber" href="http://www.jacmusic.com/techcorner/ARTICLES/English/Heater-index.htm">[2]</a>
<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> based on data, charts and discussion by Jac van de Walle <a rel="nofollow" class="external autonumber" href="http://www.jacmusic.com/techcorner/ARTICLES/English/Heater-index.htm">[3]</a>
<span class="int-own-work" lang="en">Own work</span>