Quote:
Originally Posted by Heatercathodeshort
Aluminising did away for the need of an ion trap but many makers continued to use one.
John.
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Sixty-plus years later, RACS in France were to add aluminising to several of the ion trap CRM121's they rebuilt, making them into (sort of) CRM123's! These performed well at EHTs as low as 7kV. The theory being that despite the light gain provided by the forward reflection, you needed a certain minimum of EHT to 'punch through' the aluminium coating.
Steve