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Disconnecting the original capacitor is definitely recommended. If the
original part has any leakage, leaving it in the circuit will ensure that
some heat is wasted through that leakage process. Eventually,
the original part could blow out and cause a lot of trouble.
There is not much you can do to test a capacitor with a multimeter.
You can connect it to the ohmmeter leads, and you would expect
a momentary low resistance reading, followed by a transition to infinity.
Any finite resistance measured under steady-state conditions would
indicate trouble. However, since the test voltage applied by a multimeter
is very low, you can get an infinite resistance reading even though the
capacitor would leak under actual operating conditions.
Some multimeter have a capacitance measuring function that is reliable
at least on non-electrolytic capacitors of moderately large capacitance.
An old fashioned capacitor tester in proper working condition is probably
the best thing to have when doing tube work. Good luck, all comments
welcome.
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