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Old 11th Dec 2005, 10:53 am   #18
GMB
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Join Date: Aug 2003
Location: near Reading (and sometimes Torquay)
Posts: 3,086
Default Re: Mullard Valve Tester Card Project

Quote:
The best and very quick is to cut your new card from the old green filing cabinet type files the ones with the metal top.
I haven't seen other than cardboard ones but I presume there are some kind of plastic ones now?

It is worth noting that if you do have some good ideas for card material it must be able to happily stand 1KV across the thickness and be >100M resistance. Also, if it's a thermoplastic then you need to check whether it will get too soft from the heat inside the tester. There must be absolutely no danger of splitting or cracking as if you open up an erroneous hole in the wrong place it will cause serious damage to the tester. It is rumoured that even Mullard made errors and some genuine cards can cause damage - something that I will be checking during the compilation of the card database.
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