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Alan is correct.
I had to look up "Capacitor Wizard". That is an ESR (Effective Series Resistance) tester. ESR is important consideration sometimes in solid state circuits, but not very important in tube circuits.
Tube circuits are effected more by electrical leakage and effective capacitance.
A capacitance leakage tester set to the proper voltage and with one capacitor lead disconnected from the circuit is the proper method.
Once one lead is disconnected you may as well replace the capacitor.
Even modern capacitance meters have there problems, excessive leakage can throw off the reading.
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