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AMBIENT TEMPERATURE!CMRW, CMRW-S, UCW- -M and CDW lines are identified with 25/85/21, which indicates the minimum operating temperature of-25 ºC, maximum of 85 AºC and 21 severity days to humid heat. The CMLW and CDWV capacitors are identified with 25/70/21; therefore, the maximum temperature must not exceed 70 AºC.

As a general rule, if a capacitor in your vintage tube radio is less than 0.001 uF, it is probably a mica capacitor. If it is between 0.001 uF and 1.0 uF it is likely a paper capacitor and if it's more than 1 uF it's probably an electrolytic capacitor.

With all the available literature on Film and Aluminum electrolytic capacitor comparison, it is clear that direct replacement (one to one) is not possible. We know that the capacitance requirement for Film type will be much less as that of Aluminum Electrolytic one.

The advantage of using a paper capacitor is that provides a fixed value of capacitance. The value of the capacitance is fixed during manufacturing. The main disadvantage is, it absorbs moisture in the air and decreases the insulation resistance of the dielectric.

Recapping Audio EquipmentEliminating hum among others. The electrolytic compound in a capacitor decays over time. A typical receiver has on average, 40 to 50 separate electrolytic caps in the amp and power supply sections. Some of the largest receivers have over 100 individual capacitors.

Replace electrolytic capacitors with ceramic or tantalum capacitors.

As a general rule, if a capacitor in your vintage tube radio is less than 0.001 uF, it is probably a mica capacitor. If it is between 0.001 uF and 1.0 uF it is likely a paper capacitor and if it's more than 1 uF it's probably an electrolytic capacitor.