A supplier I've used in the past (Just Radios) has these new jb JFX Premium Metallized Polypropylene Film Caps.
https://www.justradios.com/jbJFX.html
They seem pretty attractive, having good specs and a very reasonable price. The caps affordability is most likely due to the fact they are made in China.
I am looking at using them for the coupling caps in a Pass B1K.
Anyone have any experience with these caps?
https://www.justradios.com/jbJFX.html
https://www.justradios.com/jbJFX.html
They seem pretty attractive, having good specs and a very reasonable price. The caps affordability is most likely due to the fact they are made in China.
I am looking at using them for the coupling caps in a Pass B1K.
Anyone have any experience with these caps?
https://www.justradios.com/jbJFX.html
I don't see a proper datasheet with useful things like self-resonant frequency or the actual ESL and ESR ratings - just claiming "very low ESR" is unfortunately zero information. Given it also touts +/-5% as "high precise" is a bit of a giveaway. And as for the "test reports and reviews" link, that's pure farce alas.
Go for caps with actual datasheets from reputable manufacturers and you'll get what's advertized - go for snake oil caps like this and you have no idea what they are unless you are prepared to do all the measurements yourself. One things for sure you'll pay well over the odds if you are sucked in by the snake oil. My take on the meaning of "Audiophile grade" is "300% markup and some gold lettering" - this is a prime example.
For instance here's a PP cap that's 4.7uF, 630V, with inductance, resistance, temperature & ripple-current ratings, and significantly cheaper from a reputable manufacturer:
https://uk.farnell.com/kemet/r75pw44704030j/cap-4-7-f-630v-5-pp-radial/dp/2495972
Sorry, no gold lettering, but a much more pcb-friendly form-factor...
Go for caps with actual datasheets from reputable manufacturers and you'll get what's advertized - go for snake oil caps like this and you have no idea what they are unless you are prepared to do all the measurements yourself. One things for sure you'll pay well over the odds if you are sucked in by the snake oil. My take on the meaning of "Audiophile grade" is "300% markup and some gold lettering" - this is a prime example.
For instance here's a PP cap that's 4.7uF, 630V, with inductance, resistance, temperature & ripple-current ratings, and significantly cheaper from a reputable manufacturer:
https://uk.farnell.com/kemet/r75pw44704030j/cap-4-7-f-630v-5-pp-radial/dp/2495972
Sorry, no gold lettering, but a much more pcb-friendly form-factor...
Published data sheet: https://www.hificollective.co.uk/sites/default/files/jb-capacitors-jfx-series-datasheet.pdf
To use the 4.7uF value referred to as an example, it appears to actually be cheaper from HFC than the Kemet linked to above, on a +/-3% tolerance, albeit with a lower 250v rating -that should be ample however. They aren't available in a box form-factor though, if that's important for the desired application.
To use the 4.7uF value referred to as an example, it appears to actually be cheaper from HFC than the Kemet linked to above, on a +/-3% tolerance, albeit with a lower 250v rating -that should be ample however. They aren't available in a box form-factor though, if that's important for the desired application.
That is kind of why I was looking at them. They aren't very expensive for a "gold lettering audiophile cap". Still a little bit of data lacking in the datasheet but might be worth a try.
Was going to give these a try or the Mundrof MKPs.
The white Superiors are better than the black ones, and they are small in form factor. Other than that, i find them to be nothing special. Akin to a CrossCap or Erse PulseX.
Why? Decent genuine PP caps of documented performace are available at lower cost? No brainer to me.