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Old 25th March 2019, 01:18 PM
bikerhifinut bikerhifinut is offline
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Join Date: Jan 2006
Location: Penrith, Cumbria
Posts: 1,089
Default Re: KEL84 Bi-coloured LED

It did diagnose an open circuit KT88 bob, but that was more good luck due to the duff valve going in the socket where the LED was wired from.
IMHO to be of any diagnostic use there should be an individual bi Colour LED on each valve, or a single LED on the cathode of each valve to diagnose open circuits as any daft lad can see if the heaters glowing or not. Then again it would be more use to have a meter on the front panel that could be switched across each cathode resistor and then you'll get a measurement that might tell you something about the health of the device.
On Balance i like your idea of a blue LED just to indicate that its switched on. (or choose a colour of your own liking)

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