Follow the heat waves

Big thanks to a friend who lent me their Flir E4 Thermal Imaging camera

After warming up the amp, I used the camera to measure the envelope temperature of the big KT88 valves.

From the KT88 Datasheet:

Phew!

The question you may be asking: what was playing through the amplifier during this photo session? Glad you asked. Icehouse… Man of Colours.