There was damage to this and the neutralizing pages. Restoring in progress.
The photos of the Tubes under test will be available shortly.
NOTE: The wording in both of the following links INCORRECTLY direct you to http://k9axn.com/_mgxroot/page_10935.html in order to view the plates of the 6146 family with the plates at varying dissipation levels.
The correct url is http://k9axn.com/_mgxroot/page_10933.html The plates are view with lights on and off. Lights on is as you view them and lights off is the Infrared signature. Pay special attention to the heat distribution.
THE 6146B STORY 9U1.pdf
THE 6146B STORY 9U2.pdf