[R-390] Orange Drop vs ceramic disc

[Dave Maples]

Ben: If I may suggest, the ODs are fine caps, but they are radial-lead caps (designed for PC board mounting).  If you are going to redo a boatanchor, I generally find that real axial-lead polypropylene caps (Illinois Capacitor or equal) are a whole lot easier to work with.

I've done about a half-dozen boatanchors (and one Pilot AM-FM tuner used in a broadcast station) with the Illinois Capacitor axial-lead caps from Antique Electronics Supply, and I've always been very satisfied.

Just a thought.

Thanks,
Dave Maples

-----Original Message-----
From: r-390-bounces at mailman.qth.net
[mailto:r-390-bounces at mailman.qth.net]On Behalf Of Ben Loper
Sent: Thursday, March 31, 2011 3:12 PM
To: Shoppa, Tim
Cc: MillerKE6F at aol.com; r-390 at mailman.qth.net
Subject: Re: [R-390] Orange Drop vs ceramic disc


OK  I can use Orange drops throughout or I can use ceramics for bypass and
Orange drop for anything coupling a signal to the next stage.  This of
course excludes any freq determing applications (micas)

On Thu, Mar 31, 2011 at 9:29 AM, Shoppa, Tim <tshoppa at wmata.com> wrote:

> Please keep in mind that when it comes to ceramic caps, the dielectric
> materials available vary widely in their characteristics.
>
> C0G or NP0 ceramic caps could well be golden in audio applications but
> don't have enough uF per package to be used in most situations.
>
> X7R ceramic caps are probably good enough for not-hi-fi applications.
> Indeed lots of low-end consumer tube stuff from the 60's used ceramic audio
> coupling caps.
>
> Y5V caps literally sound like crap in audio coupling circuits.
>
> The latest SMD ceramic caps and their MLCC leaded cousins, almost certainly
> outperform any 50 year old NOS ceramics we have lying about, every which way
> from Sunday. I look at the high-end microwave SMT ceramic caps (actually the
> highest end ones are glass) and they beat the pants off of any leaded
> component.
>
> Tim N3QE
>
> From: MillerKE6F at aol.com [mailto:MillerKE6F at aol.com]
> Sent: Wednesday, March 30, 2011 6:04 PM
> To: Shoppa, Tim; n4buq at knology.net; r-390 at mailman.qth.net
> Subject: Re: [R-390] Orange Drop vs ceramic disc
>
>  RE: Maxim capacitor paper.....
>
> Granted that at the super low distortion levels  the effects of ceramic
> types can be measured, but  in a typical communications receiver audio
> amplifier section where THD  products of  5 percent or 10 percent are the
> norm,  I doubt if distortion products down 60 db or more are going to be
> measurable let alone heard by mere mortals.
>
>    And the tests were all done on the smaller SMT caps and I'd like to know
>  if physical size makes any difference, especially on the DC voltage applied
> parameter.  Always willing to read a good study.
>
> Cheers
>
>    Bob, KE6F
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