Friday, 27 January 2017

Follow the heat waves

Big thanks to a friend who owns a Flir E4 Thermal Imaging camera and lent it to me for the weekend.

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


Not surprised at the 172º reading. (340ºF)



Strangely this one runs a little cooler than the rest. Its bias current is the same, 50mA


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. Since I'm going to be seeing them live tomorrow.

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