Per the iec guidelines.
Substitute for ceramic capacitor.
I meant 47 uf.
Polystyrene capacitors are generally unavailable nowadays.
Yes you are right i made a mistake.
However mica capacitors can be replaced with ceramic capacitors in general.
Small value ceramic capacitors are generally used for electrical coupling or decoupling of intermediate circuit stages and plastic or metal film make suitable replacements.
You are also right the original part is 470 pf.
There are two classes of ceramic capacitors available today.
Ceramic capacitors were first developed in the 1920s in germany as a substitute for mica dielectrics.
The original part is ceramic non polarized.
In the 21st century the international electrotechnical commission iec currently separates ceramic capacitors into two classes.
Film capacitors cannot be replaced with ceramic or mica capacitors if used for analog signal processing.
The two most common types are multi layer ceramic capacitors and ceramic disc capacitors.
Class 1 and class 2.
Ceramic capacitor definition a ceramic capacitor is a capacitor which uses a ceramic material as the dielectric.
Finally i could put several smaller high voltage ceramic capacitors in parallel so that the load is split over many.
For example 10 100 pf ceramic capacitors in parallel is much cheaper than 1 1000 pf silver mica capacitor and the ceramic capacitors are rated for 2 kv while the mica is rated for 500 v.
A ceramic capacitor is a fixed value capacitor where the ceramic material acts as the dielectric it is constructed of two or more alternating layers of ceramic and a metal layer acting as the electrodes the composition of the ceramic material defines the electrical behavior and therefore applications.
The mod i am doing they call it the voodoo chile mod says to substitute the 470pf cap for a 47 uf cap.