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The Basement
A high-tech anachronism
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<blockquote data-quote="Mike Diack" data-source="post: 148351" data-attributes="member: 144"><p>Re: A high-tech anachronism</p><p></p><p></p><p>Pencils come with their own hazards. Over 4 decades ago a friend had the local transformer winding company rewind a transformer for a big old tube Philips oscilloscope. This was pre switchmode era and so involved many thousands of turns of very fine wire for the EHT, carefully insulated between layers before terminating to phenolic tag board. Winders, wanting to make a tidy job, marked out the position of the tags on this board for drilling using.....a pencil. This provided an ideal track for breakdown when power was applied. The transformer didn't last long.</p><p>M</p></blockquote><p></p>
[QUOTE="Mike Diack, post: 148351, member: 144"] Re: A high-tech anachronism Pencils come with their own hazards. Over 4 decades ago a friend had the local transformer winding company rewind a transformer for a big old tube Philips oscilloscope. This was pre switchmode era and so involved many thousands of turns of very fine wire for the EHT, carefully insulated between layers before terminating to phenolic tag board. Winders, wanting to make a tidy job, marked out the position of the tags on this board for drilling using.....a pencil. This provided an ideal track for breakdown when power was applied. The transformer didn't last long. M [/QUOTE]
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