Capacitor choice

[SirPaulGerman]

I am looking for Film Capacitors 100uf 200V, is for a preamp

 

[Lojzek]

I am in the same boat, I am looking for 11 100uf 250 V film capacitors for a good price.
Very expensive 100uf film capacitors, any leads for cheaper prices ?

There is a company selling small 400V caps and you would need 147 to form one 100uF for a price of 9 € ,
not counting soldering job and the pcb (one sided 180x250mm) to make. 😗

 

[ScottG]

(Nemohm) Try Digikey or Mouser from their Canadian website; doesn’t have to be film (could be non-polar electrolytic) but you would be better off if it was film.

 

[SirPaulGerman]

What about replacing the 100uf Film Caps with good quality Electrolytic capacitors ?

 

[asuslover]

SirPaul
Why would you do that?Can you give examples of good 100uf electrolytics?

 

[SirPaulGerman]

Well the preamp is very old, from 1978, is a Crown Straight Line 1

Here is a pic of the 13 Film capacitors I want to replace

 

[asuslover]

Why replace them? You don’t like the color?😄

 

[SirPaulGerman]

The film caps are from 1978, I was under the impression I can do better, maybe not

 

[Andersonix]

Here is a pic of the 13 Film capacitors I want to replace

Maybe those are 100nF (0.1uF)? Defiantly not 100uF....?

 

[SirPaulGerman]

Nope they are
100uf 200v filmatic
or 0.1 MF 200V

 

[asuslover]

I wouldn’t…I wanted to say they are kind of small(size) for 100uf film caps

 

[Andersonix]

0.1 MF in 1978 means 0.1uF today due to inflation

 

[SirPaulGerman]

Is too expensive, I am looking on ebay for nos film caps and very expensive

 

[6L6]

@SirPaulGerman

The film caps are not 100uF. They would be the size of red bull cans.



They are very likely 0.001uF, and I also suspect not all are that value, some are 0.068, some 0.47.

Schematic here - https://www.crownaudio.com/en-US/product_documents/sl1-owners-manual-sl1ownersmanual-pdf

Replace them if you want, I guess, but film caps do not go bad with age, and changing to a "better" capacitor is usually a psychological change rather than an electrical one.

 

[benb]

Back 50+ years ago MF on a capacitor meant microfarads. There was also MMF which meant picofarads. You're thinking M means milli, but in modern nomenclature milli is represented by a lower case m. Capital M is (now) mega. Modern prefixes are listed here:
https://en.wikipedia.org/wiki/Metric_prefix

Wikipedia mentions "historical markings" in its really long article on capacitors:
https://en.wikipedia.org/wiki/Capacitor#Historical

 

[SirPaulGerman]

I am not sure,

Here is the manual for the Crown Straight line one

.1mF 200V Filmatic X12

Page 15
https://www.hifiengine.com/manual_library/crown/straight-line-one.shtml

Just to be sure .1mF = .1uf ?

 

[6L6]

Screenshot and post what you are looking at. Hifi engine hasnt been accepting new members for quite some time now, so that lik is useless to many people.

 

[SirPaulGerman]

PDF here

 

[Lojzek]

The manual appears misleading.
0.1 mF does not read 0.1 milli Farad, but 0.1 micro Farad.
So, you are in need of 100 nF or 100 nano Farad.

A film 100 uF (microF) capacitor is much larger physically.

 

[benb]

The manual was normal for the time it was printed. Most capacitors on that page say mF meaning microfarads at the time (ahem, I was there as a teen when I was first learning this stuff). Again, see the "historical markings" link in my post #35.
Reading "1000mF 40V Axial" using modern prefixes would be a 1 farad capacitor, but no, m was short for the micro prefix, and it's 1000 microfarads.