Re: Racal Dana 9916 Frequency Counter.
Tantalum caps. We have the late Les Lawry-Johns to thank for the "Blue" tants concerns. Reds, blues, buffs, all the same. I have had very few failed ones over the years (plenty in the Grundig TVs I worked on for years, NEVER a failure).
However, they seem to fail quite quickly if used in decoupling voltage rails, but ONLY if their voltage rating is too close to the voltage in the circuit.
Usually if one has gone short in such circumstances, there is a good chance its head is visibly blown off, or a black burn mark somewhere.
Les.
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