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Old 13th September 2004, 11:23 PM   #1
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Default Best audio cap

I want to know what is the best type of capacitor for audio amps? I am talking about the zobal cap, input cap, etc. I already have the power supply built with 4 3300uf Illinois Capacitor caps per rail and one 0.1uf film cap per rail on the PSU board, and one per rail on the amp board itslef. I also have an AC cap across the power input plug and the power switch.

On the amp, what should I use? Tantalum? Polyester Film? Polystyrine Film? Something else?

And what type of resistor? Metal film? Metal oxide? something else?

BTW, this is going to be a 400W audio amp, using 2 LM3875 amps bridged with transistor outputs (MJ15003/4). It is driving a 12" 8ohm sub.

Thanks for all the help
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Old 14th September 2004, 10:54 AM   #2
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I applied all resistors by metal oxide type in my audio amplifier. For capacitor at zobel network, I used cap MKP type.

PSU, I used Panasonic 3300uf.
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Old 14th September 2004, 11:57 AM   #3
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From what I understand, a mix of metal film and carbon film resistors in the amps gives a more balanced sound. Using metal film alone could be a bit bright.

I also understand that polyester or polystyrene caps (perhaps the latter in particular) have better audio quality than any ordinary electros. With regards to input caps, I have seen Black Gate N 4.7uF used. I don't know what else others are using. (Haven't been paying attention.)

I haven't actually fired up my new amp(s) yet (valve buffered LM3875), but for what it is worth I am trying Black Gate std 1000uF for decoupling, and Caddock feedback and Riken resistors. I also have Solen caps in there. I have put in a zobel by Carlos' recommendation, using carbon film resistors of unknown origin and 0.1uF Black Gate NX caps which I had lying around. I also have 4.7uF Black Gate N's with which I will try bypassing the decoupling caps.

In the PSU I have 1000uF Rubicon ZL on each rail, and 0.1uF ceramics across the AC before the bridge.

Sorry I can't tell you what is "best"; I can only tell you what I am using based on researching what others' opinions are, with a nod towards manufacturers' claims. I have probably spent too much on this amp, but what the hay... it's my amp.

Build and Enjoy!
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Old 14th September 2004, 12:23 PM   #4
Nuuk is offline Nuuk  United Kingdom
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I think that this topic has been covered on more than a few occassions but here goes.

Film caps are better than electrolytics (including BGs).

In order of preference:
Polystyrene
Polypropylene
Polycarbonate
Polyester

BUT

You can't get film caps with very large capacitance so you have to use electrolytics sometimes.

Polystyrene caps (usually) only come in pF, and nF sizes. Ideal for filters etc.

No cap is always better than any cap but sometimes you just have to have one for a variety of reasons (eg keeping your speakers safe)

Not all capacitors of any type are the same and sound quality can vary according to make and model.

Sometimes, physical size will dicate your choice of cap.
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Old 15th September 2004, 01:06 AM   #5
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Quote:
Originally posted by falcott
I have probably spent too much on this amp, but what the hay... it's my amp.

Build and Enjoy!
Ooohhhh, I love this...
Good one.
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Old 15th September 2004, 02:19 AM   #6
cwteoh is offline cwteoh  Malaysia
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Guys,
I am thinking of using electrolytics Panasonic FC series Caps after the rectifier dridge at my regulated PSU and other with low capacitance I use Polyester Wima MKS2 series caps. Any comment?

Anyone hear about Rubycon caps, Elna???
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Old 15th September 2004, 03:30 AM   #7
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Quote:
I am thinking of using electrolytics Panasonic FC series Caps after the rectifier dridge at my regulated PSU and other with low capacitance I use Polyester Wima MKS2 series caps. Any comment?
Panasonic FC series is a good one. I would like to recommend you the Rubycon cap. The quality is not different. By another thing, You might try BC component X2 series.

Quote:
Anyone hear about Rubycon caps, Elna???
I've ever tried Elna cap. It made sound so bad. For me, Elna cap is not good.
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Old 15th September 2004, 04:29 AM   #8
cwteoh is offline cwteoh  Malaysia
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X2 Series? I don't think I can get it from Farnell.
That must be a lot of series for Rubycon caps. What I got in hand is CE Series. I don't know how is is quality. But I got it from the component shop cost me USD1.25.
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Old 15th September 2004, 04:51 AM   #9
cwteoh is offline cwteoh  Malaysia
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Sorry... I got wrong info ... it is Rubycon CE 50V 4700uF, US Series 105' C. Price USD1.25 each. Do you have any regcomended series in Rubycon? for 4700uF?
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Old 15th September 2004, 07:38 AM   #10
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Let me check its series first, then I will tell you the series that I used.
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