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Old 16th Apr 2019, 3:15 am   #7
Radio Wrangler
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Join Date: Mar 2012
Location: Fife, Scotland, UK.
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Default Re: HP 180A scopes - anything I need to know?

In the plain old 50MHz Y-amp plug-in, the output transistors are mounted on four white ceramic insulators sitting on a bracket off the rear panel.

BEWARE. That ceramic is beryllia, BeO. Ten micrograms of inhaled beryllia dust is reckoned to have a 50% probability of fatality. Do not drill, crack, abrade, etch or otherwise damage these things.

Small pieces of this stuff are common in RF power transistors, but are sealed inside packages if you're lucky, but may be an exposed part of the package.

David
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