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Old 26th Jan 2022, 1:26 pm   #10
Helder Crespo
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Join Date: Sep 2019
Location: Crystal Palace, Bromley, London, UK.
Posts: 345
Default Re: Lemco dogbone capacitors

Originally Posted by Radio Wrangler View Post
Better known as tubular ceramics. They've stood the test of time quite well.

There were 'High-k' ones in the 1000pF region, as well as low tempco ones in the 1-100pF region.

Thanks David. In my searches I have been using both terms (dogbone and tubular ceramic). Still hard to find. They do seem to be quite robust, and I've read elsewhere that the only time someone found a faulty one this was due to mechanical breakage. However, they do seem to be a bit on the low side nowadays. Usually still within tolerance, but low nevertheless. Perhaps some degradation/oxidation in the metallic coating over time in spite of the epoxy coating, e.g. due to trapped residual contaminants.
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