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Old 6th November 2010, 07:44 PM   #11
jcx is online now jcx  United States
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I haven't found any polystyrene that explicitly state that they are extended foil construction - some of the NOS boxed types?

the common "jelly roll" fused polystyrene/foil will be inductive at frequencies where DAC switching glitches, clock feedthru components are expected

most of the current production Boutique audiophile polystyrene are physically too large (high parasitic inductance/low SRF), as well as too high in value

Last edited by jcx; 6th November 2010 at 07:50 PM.
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Old 8th November 2010, 03:36 AM   #12
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John Curl, I was considering the REL RT, and think that I can get them to fit where I need them. I have heard from a few other folks that polystyrene film/foils are the way to go.
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Old 17th November 2010, 08:53 AM   #13
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Hi Barrows,

I just ordered some 1nf REL RTs to replace the Panasonic Z-series filter caps on the Legato. I'll let you know how it goes. I'm still not sure whether to add PS caps to C1-C4 or leave them empty though.
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Old 17th November 2010, 01:35 PM   #14
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The RTs are pretty large. Are you planning to mount them on the underside of the board? I am going to try the smaller REL RTE. I think pretty soon I will order up a new Legato board.
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Old 17th November 2010, 03:49 PM   #15
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RT polystyrene is extended foil, I am fairly sure, due to its measured self resonance and method of attaching the leads. However, REL RT is a fairly large cap and cannot easily replace surface mount or similar sized caps, without a lot of trouble.
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Old 17th November 2010, 03:53 PM   #16
jcx is online now jcx  United States
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I realize the glare from JC's halo makes it hard to see other poster's points - but the Blowtorch thread recently touched on caps again - and someone pointed out that extended foil polystyrene are available

LCR EXFS series boxed polystyrene should be superior in very high frequency performance to the Boutique caps - which should be important in a DAC output circuit

It was also pointed out in those discussions that for microphonics mass production caps made on high speed winding machinery could be better than the “hand wound by virgins” Aduiophile caps of the same materials
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Old 17th November 2010, 04:04 PM   #17
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JCX. I appreciate your concerns about avoiding potential inductance for high frequency filter circuits. The REL RTE are a "box" style cap, but I do not know if they are wound or stacked internally. These are small caps though, and I doubt that they are hand wrapped by either angels or virgins!
Do you have a source for the caps you are referencing?
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Old 17th November 2010, 04:23 PM   #18
jcx is online now jcx  United States
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I didn't see the picture - you would think it would be simple enough to include the words "extended foil"

LCR COMPONENTS|EXFS/HR 1000PF +/- 1%|CAPACITOR, 1.0NF 63V CAPACITOR | Newark.com
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Old 17th November 2010, 04:43 PM   #19
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I just spoke to the owner and designer of Reliable Cap. The RTE's look OK to me, AND they do have a smaller footprint. Bas says ALL normal caps from Rel are EXTENDED FOIL. End of story.
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Old 17th November 2010, 05:34 PM   #20
jcx is online now jcx  United States
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viewing the rel cap site Reliable Capacitors it is NOT clear - the "RT" series is the only polystyrene listed - and doesn't go down to 1nF

some audio Boutique distributors have the 600 V RTE boxed caps - at ~$8 a pop - you get the 5 pc min of the LCR EXFS for the price of 1 RTE

but I don't see RTE speced on RelCap's site

I would be perfectly happy using current production, fully speced extended foil ps caps but "the story" isn't complete re REL from what can be seen online

Last edited by jcx; 17th November 2010 at 05:48 PM.
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