Re: Lightning icon required =========>
"It was going quite well until I noticed that one valve was entirely glowing red."
The only valve TV that I ever owned was terrifying. It dropped 240V down to whatever it wanted internally by way of a big length of ceramic with wire wrapped around it. Effectively a huge resistor doing double duty as a bar heater - yes, it glowed red.
After seeing that, I came to appreciate my mother's paranoia with televisions spontaneously combusting. Hence an approriate icon.