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Old 15th September 2017, 12:18 AM   #61
CBS240 is offline CBS240  United States
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Yes, it does appear to be lower than pure copper.
Good link, nice chart! That may helpful: ) I'm not sure about % of copper, it was part of a finished and polished sign of stand out symbols made of a gilding brass I assume😕, probably high copper but really it is the realitive mass of the material that aids in keeping a safer limit on peak temperature rise, at the expense of higher average temperature, of which does not affect these devices. I think being able to use a larger surface area for the mica insulators is a big advantage. If I could get pure copper shims, coated or gold plated, that would be awesome. As it is, scrap metal IS cheaper. . In all, so far, I have not had a problem with overheated transistors as long as they are tightly mounted. Driving it till it blows is one of the tests I intend to perform.😎
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