Infrared thermal cameras are great for checking on flyback health and electrolytic capacitor health. Also surprising is how cool the ultor rectifier tube runs. All pictures are of a GE Portacolor:

http://www.videokarma.org/attachment.php?attachmentid=204859&stc=1&d=1663565088
Visible light spectrum, camera flash is on.

http://www.videokarma.org/attachment.php?attachmentid=204860&stc=1&d=1663565088
Visible light spectrum, camera flash is off.

http://www.videokarma.org/attachment.php?attachmentid=204861&stc=1&d=1663565088
Infrared light spectrum for thermal imaging. Reticles show minimum temperature, maximum temperature, and the white reticle shows the temperature of the targeted area of the picture. Temperature is in fahrenheit.

http://www.videokarma.org/attachment.php?attachmentid=204862&stc=1&d=1663565088
Ultor rectifier is only 84F. It is a 1AD2A, which has enough x-ray shielding built in that the high voltage cage door isn’t even installed in this model of Portacolor.

http://www.videokarma.org/attachment.php?attachmentid=204863&stc=1&d=1663565088
The flyback transformer donut is 109F. This is a very low temperature for a tube type flyback!

What model FLIR are you using?

What model FLIR are you using?

Flir One Pro iOS.

Years ago I had an Agema FLIR 550 package, wonderful little camera in the day.