diymod questions regarding capacitors

[AudioCats]

.47uf/200v FT-2's occasionally show up on ebay. Size is about the same as a 0.1uf/600v FT3 (which is 2/3 of a .22uf/600V FT3).
 
The difference between FT2 and FT3 is not that much.

 

[FallenAngel]

0.47uF FT3, kind of pricey though
http://cgi.ebay.ca/0-47uF-200V-teflon-capacitors-FT-3-TESTED-1000V-Lot-2-/190415312941

 

[tranhieu]

uhm... my understanding is that bypassing caps are for blocking DC going through and because of the corner frequency matter they often have high values thus their big size
coupling caps are for smoothing the midrange and treble so their value can be small and of higher quality (why?)
based on my calculation I need to get at least 1.8uf in total, so 1 or 2 ft3 are not sufficient, that's why I want to make them coupling caps~
those mundorl oil/silver cost twice as much compared to the ft3 here in uk~

 

[Ferrari]

Quote:

uhm... my understanding is that bypassing caps are for blocking DC going through and because of the corner frequency matter they often have high values thus their big size
coupling caps are for smoothing the midrange and treble so their value can be small and of higher quality (why?)
based on my calculation I need to get at least 1.8uf in total, so 1 or 2 ft3 are not sufficient, that's why I want to make them coupling caps~
those mundorl oil/silver cost twice as much compared to the ft3 here in uk~

Some "food for thought" is probably necessary.

 

 

[tranhieu]

just got more food, thanks for pointing out

 

[AudioCats]

so the .47uf/200v is FT3, not FT2.....
 
Is the FT # related mostly to the diameter? construction-wise the FT2 and 3 are basically the same...
 
Quote:

0.47uF FT3, kind of pricey though
http://cgi.ebay.ca/0-47uF-200V-teflon-capacitors-FT-3-TESTED-1000V-Lot-2-/190415312941