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  #1  
Old 18th October 2008, 11:29 PM
graeme
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Default 3.3nf?

Looking for some 3.3nf caps for kel84 feedback mod.

Just checking, 3.3uf, thats 3300pf right?

Cant find any 3.3uf except from RS, yet...
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  #2  
Old 18th October 2008, 11:57 PM
Wieslaw Lipowski's Avatar
Wieslaw Lipowski Wieslaw Lipowski is offline
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Default Re: 3.3nf?

Quote:
Originally Posted by graeme View Post
Looking for some 3.3nf caps for kel84 feedback mod.

Just checking, 3.3uf, thats 3300pf right?

Cant find any 3.3uf except from RS, yet...
3.3uF = 3300nF

3.3nF = 3300pF
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  #3  
Old 19th October 2008, 10:17 AM
Richard Richard is offline
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Default Re: 3.3nf?

Graeme,

The value you need is,

3.3nF = 3300pF = 0.0033uF

Maplin have suitable ones here, WW25C,

http://www.maplin.co.uk/Module.aspx?ModuleNo=353

Rich
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  #4  
Old 19th October 2008, 04:04 PM
graeme
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Default Re: 3.3nf?

Great, thanks.

I thought i was right but best to check.

Ive found quite a few 3300pf, lots of different ones. Might try a few.
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  #5  
Old 19th October 2008, 04:31 PM
Richard Richard is offline
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Default Re: 3.3nf?

Many small vaue caps these days are ceramic which tend to be loose tolerance and vary with temp.

Thoughts for caps in this position are generally towards; silver mica, polystyrene, polypropylene and better mylar/polyesters such as those Maplin ones.

Rich
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  #6  
Old 19th October 2008, 04:36 PM
graeme
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Default Re: 3.3nf?

Ive found polystyrene, polypropylene and silver mica.

Not sure what ill go with yet, theres a few other mods ill do first before i try this anyway.
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Old 19th October 2008, 04:40 PM
graeme
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Default Re: 3.3nf?

Oh, ive also found high quality paper in oil.

Any good for this aplication? Ther by the 100 though, but not expensive.
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Old 19th October 2008, 05:08 PM
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Wieslaw Lipowski Wieslaw Lipowski is offline
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Default Re: 3.3nf?

If those 3.3nF go in NFB circuits, I'd choose polystyrene at about 160V.
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  #9  
Old 19th October 2008, 05:14 PM
graeme
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Default Re: 3.3nf?

Why's that?

I have no idea about how different types of cap change the sound. I assume different types of cap in different aplications too?
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  #10  
Old 19th October 2008, 07:05 PM
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Wieslaw Lipowski Wieslaw Lipowski is offline
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Default Re: 3.3nf?

I believe it is due to Polystyrene having the shortest 'memory' of any dielectric, even better than teflon, IMO.
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