I can't say that I know a whole lot about capacitors but the only time I have used tantalum is for power supply filtering. Personally, I doubt that I would consider them for something like a tuned circuit. A very quick glance at DigiKey shows that tantalum capacitors come with a 5%, 10% or 20% tolerance.
OTOH, I do tend to use film capacitors and they are available in tolerances as low as 1%. For very low capacitance values, mica capacitors have much lower tolerances. They just don't have much range. Same for thin film capacitors...
Go to DigiKey and look through the various types of capacitors
For timing circuits, I tend to use 1% film capacitors and 1% thin film resistors. As the results of analog computing circuits are usually displayed on an oscilloscope of one kind or another, accuracy in excess of 1% just isn't warranted. At some point the cost becomes prohibitive.
Richard
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Posted by: rstofer@pacbell.net
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