Test Reports and Reviews of
jb JFX Premium Metallized Polypropylene Capacitors
Test report from an Audiophile in France (Mr. SAM BENELBAZ )
Samples tested by Mr. SAM BENELBAZ
jb JFX—premium metallized polypropylene film capacitors
jb JFX 94uF 250VDC +/-5% Bulk RoHS ，2pcs
jb JFX 22uF 250VDC +/-5% Bulk RoHS ，2pcs
jb JFX 3.5uF 250VDC +/-5% Bulk RoHS ，4pcs
Introduction of Mr. SAM BENELBAZ
French, retired, have the hobby of TUBE do it yourself; used to work in IBM as a professional of electronics; after that for LASER a company involved in point of sales solutions and hardware maintenance, in that position, he bought a French company sic-safco.
Mr. SAM BENELBAZ is member of some forums in US and France, some are AUDIOASYLUM.com, DIYAUDIO.com, FUN WITHTUBES.com and some others.
Original letter from Mr. SAM BENELBAZ
I hope you are ok.
I have installed the JFX capacitors last Sunday and i can now give you my impressions.
But first I have to tell you what speakers and amps I used for the test:
The speakers are YAMAHA NS
The amps are two American CARY tube amps model
In this test the EL34 are NOS Philips EL34 of the XF2 series (the best).
The Yamaha crossover was using mainly NICHICON capacitors using metalised paper.
I did replace every capacitor with the ones you send me.
The CDs I use for the test are very good Cds , classic music and jazz mainly.
I know them very well and can hear the differences well.
Now lets come to the findings:
The JFX have good audio imaging and you can hear obviously more details than with the Nichicon .
I think this is because they are wounded very tight.
Congratulations to the worker who did the job.
At this very moment i think that JFX are very good capacitors for crossovers and with their price-sound ratio you can go to the market without any shame.
My best regards
Reporting back on these JB JFX caps and they are
wonderful folks. I can't say it more clearly. They compete with any cap and I
don't care of the cost.
I have used them in two different preamps and one amp…. all tubed units. I used them as coupling caps with great results.
They are sleepers are dirt cheap.
One needs to understand I compared all of theses, except the
the power conditioner. I mixed, matched, & rotated these 'dogs' over several months time. As I came to understand the tonal inflections &
character each brought to the filter/feeding of the digital, preamp, & amp
sections, I simply feel S/G/O 'plays well' on digital sources. It's a great cap. Killer vocals. Great soundstage. The JFXs take that & send it out via pre & amp w/aplomb. Now the Duelands may do that ever more so, but I already owned the Mundorfs & the JFXs size & cost made an easy choice for the larger values. They have an incisive spacious sound w/very good attack & decay, require little break in & represent exceptional value.
Ok gang, I have been using a cap that is so good that I'm
afraid when you hear the price most will disregard my comments. Keep in mind I
compared it to the best - Duelund CAST copper.
This cap came very close to the CAST and offers a richer sound it is also more expansive sounding. The bass is more full bodied. It lacks the ultimate degree of detail of the Duelund. The Duelund is a tad more resolving and in the end is still the king. However, you must try this cap out as you will be amazed. I would use it ahead of any Mundorf as well as most every other cap aside of CAST.
It is my cap of choice based on sound quality and price. I have only tried it in tube amps and preamps mind you.
They cost under $10 for values under 7uf. Yes, this cheap and darn good. Yes, metalized film.....Yes, it still is this good.....
Several other Audiophiles have heard them and also agree 100%.
You can get them at Just Radios in
Oh yes the name ......JB JFX Premium caps.
"During the last 25 years, I've used MIT, Relcaps under various company names, Mundorfs, The jb JFX caps are better than the others.”