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Old 14th February 2003, 03:59 PM   #1
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Default Precision polypropylene 1% caps - any good?

Hi!

Has anyone used BC Components KP460-464 1% precision polypropylene caps?

My application would be vinyl amp.
http://www.elfa.se/pdf/65/06510002.pdf
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Old 14th February 2003, 04:18 PM   #2
halojoy is offline halojoy  Sweden
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Default Re: Precision polypropylene 1% caps - any good?

Quote:
Originally posted by peranders
Hi!

Has anyone used BC Components KP460-464 1% precision polypropylene caps?

My application would be vinyl amp.
http://www.elfa.se/pdf/65/06510002.pdf
I have not yet.
But if I will build my active bi- or triamp system,
those Caps I will use in the active filters.
1% metalfilm resistors and 1% polypropylene caps.
I think it is hard to find such good polypropylene
for that price.

Better than big passive inductors and capacitors
spoiling the DC-output in Power amp.
--------------------------------------------------------
What is the big fuzz with DC-output
if you after that put capacitors before the voicecoil.
That I have never understood.

And what is the big fear of having a big output cap,
if you still will put a cap in the crossover?
And dc-offset fuzz???? You tell me....
--------------------------------------------------------

/logical halo - polypropylene-lover - and when He uses DC-coupled output
it is NOT a cap in the way
and certainly no inductor either
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Old 14th February 2003, 04:19 PM   #3
halojoy is offline halojoy  Sweden
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q
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Old 14th February 2003, 04:27 PM   #4
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Default Re: Re: Precision polypropylene 1% caps - any good?

Quote:
Originally posted by halojoy

What is the big fuzz with DC-output
if you after that put capacitors before the voicecoil.
That I have never understood.
Halo, you must be joking?? You really can't see any difference between a DC coupled amp and a AC one?

My bass speaker hasn't got any caps...(where the power goes)

OK, you are joking, right? And while we are at it I think AD161/162 is the transistors ever made, such delicate sound the can produce..
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Old 14th February 2003, 04:32 PM   #5
halojoy is offline halojoy  Sweden
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if you do not read me right enough to understand
my meaning
there is no use me repeating the message
--------------------------------------------------
still I think you can use those caps
with a happy smile
(to keep onto your subject)

/halo - are there such things as dumb swedes? can't be
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Old 14th February 2003, 05:15 PM   #6
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DC coupled but having a cap (such as crossover, say for tweeter) in series with the speaker? Yeah, that does seem odd...

Tim, builder of transformer-coupled tube amps, which cannot possibly have any DC in the output whatsoever
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Old 14th February 2003, 05:34 PM   #7
Mad_K is offline Mad_K  Norway
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I use that kind of caps to load my MM pickup.
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Old 14th February 2003, 05:43 PM   #8
Bobken is offline Bobken  United Kingdom
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Hi,

If you have ever made a direct comparison with an otherwise similar amplifier, the bass will (nearly?) always seem firmer with a DC coupled amp when compared with a capacitor coupled one.

I believe that phase shifts at the bottom end have a lot to with this effect.

Apart from the fact that even the very best (inevitably) low value film caps are not sonically benign, most capacitor-coupled amps need such a large output cap, that it usually needs to be an electrolytic, which are ruinous to the sound, in my experience, even the excellent BGs which I would never use in a signal path like this.

As peranders has said, even though in tweeter and midrange X'overs you will generally find a series coupling cap (which because of the smaller size could be a film cap, anyway), I have never yet seen a capacitor *in series* with a woofer (they are used in shunt across them, though) so there is nothing odd about the arrangement suggested at all.

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Old 14th February 2003, 05:57 PM   #9
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Default Re: Precision polypropylene 1% caps - any good?

[QUOTE]Originally posted by peranders
[B]Hi!

Has anyone used BC Components KP460-464 1% precision polypropylene caps?

My application would be vinyl amp.
---------------------------------------------------
Many BC caps are magnetic;I would test it first. Otherwise ERO, Vishay, Wima and others make excellent pp and ps caps.
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Old 14th February 2003, 06:09 PM   #10
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Quote:
Originally posted by Bobken
, I have never yet seen a capacitor *in series* with a woofer (they are used in shunt across them, though) so there is nothing odd about the arrangement suggested at all.

Regards,

Well, then you've never seen my crossover! I have a trap circuit in series with the woofer to attenuate a peak in the response at around 800Hz. In addition to an inductor and resistor, there is a 102uF cap all in parallel, and then in series with the woofer. Believe me that you need a good film cap for that, and it is expensive.

RonS
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