I thought I was losing my mind - I'd checked Mouser before posting. Then double checked after your post. They didn't show up because I had the 5% tolerance filter in place. And sure enough, they have stock in 20% - thank you! 😀
Good stuff, will check them out. Thanks!
There is also FKP4 , 1uF / 400Vdc on stock.
Sorry, forgot to mention first time.
Well there are the 715 P and 716P series of caps, formerly made by Sprague, but they are likely to be on the largish side. The FKP1 series from Wima are not actually film and foil, but are made with a combination of metallized film plus "super metallized film". The overall effect is similar to that of a std film/foil, but it ain't, really. The values I've seen on the 715P series at Mouser and Digi-key stop at 0.47 uF.
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Wrenchone could You please clarify situation with FKP4 series ?
I have the datasheets for FKP1,2,3,4.
You are right for FKP1.
FKP 2 & 3 are film/foil but FKP4 - this I'm not so sure, don't understand German and the language is not clear - in FKP2 & 3 they say film/foil.
Huh. Good to know, thank you for that.
I've gone ahead and ordered FKP4 and 715p (2 x 0.47uF). 716p (copper vs steel leads) sold out.
Good point about the FKPs. FKP 2 and 3 are indeed "film/foil", and Wima recommends them for audio applications. In contrast, Wima calls the FKP 4 "pulse capacitors". Looking at the diagram of the internal construction you can see that the FKP 4 are a serial connection of two units, where the outer plates are proper metal foil, whereas the inner plate is a metallized plastic film.
I guess the best Wima option would be to parallel several 0.22 µF FKP 3 parts (FKP3C032204J00) to obtain 1+ µF.
See here:
https://www.wima.de/en/our-product-range/filmfoil-capacitors/fkp-2
https://www.wima.de/en/our-product-range/filmfoil-capacitors/fkp-3
https://www.wima.de/en/our-product-range/pulse-capacitors/fkp-4
I've looked over the thread and I can't see why you are specifically trying to find a capacitor with film/foil construction? The only thing that really comes to mind would be a DC link or pulse applications in a SMPS application but the small value (1uF) doesn't make sense there. Just curious...
Hal
Hal
Tube circuit - decoupling with film/foil instead of mkp, I mean series coupling cap between two gain stages or on output of preamplifier.
Smaller values can be used in RIAA eq.
This at least was my reason for buying 1uF / 630 Vdc Wima FKP4 and also for using fkp2&3 in RIAA eq.
Did not compare them yet, so what, if any difference can be had with fkp4 - can't tell.
On the other hand my current thinking goes that project & implementation are much more important than parts used. So buying those fkp4 bricks is for experiment purpose.
Smaller values can be used in RIAA eq.
This at least was my reason for buying 1uF / 630 Vdc Wima FKP4 and also for using fkp2&3 in RIAA eq.
Did not compare them yet, so what, if any difference can be had with fkp4 - can't tell.
On the other hand my current thinking goes that project & implementation are much more important than parts used. So buying those fkp4 bricks is for experiment purpose.
Hi, I use CORNELL DOUBLER in both my MC phono amp & re-capping my Pass B1/Korg along with other members. Great sounding & not to expensive.
Cheers
Cheers
I am not sure. For example, take a look at their PPFX "Film/Foil" caps. They make them up to 30 µF with 200 V rating with dimensions of 1.3 x 1.5 x 2.8 (either inches or cm, they don't tell...). This would be extremely small compared to other (real) film/foil caps, which are usually have a 10x higher C/size ratio. I am not convinced that the REL caps are really "film/foil".
I just want to mention for the sake of anyone who could benefit, that I found double-metallized polypropylene capacitors to sound significantly better than single-metallized capacitors in the output filter of a class-D power amplifier. Which probably isn’t surprising, as they are typically advertised as being targeted to steep ‘pulse’ applications. A very worthwhile component upgrade for an amplifier using single-metallized capacitors in the output filter, in my experience.