The burnt one on the right has been used for experimental purposes and is one of an old batch, but compare the base soldering with the one on the left. I have had a lot of failures of these in my Trigon lamps, but this has stopped on lamps produced recently. (Since Oct ish 2012)
This photograph is by royfellows and was uploaded February 1st 2013. © royfellows please do not copy or distribute without prior express permission.
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