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hot tubes
Silver Member

Canada
162 Posts

Posted - 03/27/2009 :  06:31:08  Show Profile  Reply with Quote
how good are these op-amps :
texas instruments RC4558P

are they any better than stock production units ?

thanks

Laurie
Double Platinum Member

Canada
4854 Posts

Posted - 03/27/2009 :  13:12:25  Show Profile  Visit Laurie's Homepage  Reply with Quote
I've found them to be fine. The breakup isn't quite as smooth as the JRC4558, but other than that they sound good to my ear. I've done numerous repairs with the TI version and no complaints.
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zentropa
Gold Member

USA
837 Posts

Posted - 04/01/2009 :  08:19:18  Show Profile  Send zentropa an AOL message  Reply with Quote
compared to which stock production units?

guessing vs. the jrc4558dd?
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Laurie
Double Platinum Member

Canada
4854 Posts

Posted - 04/01/2009 :  09:26:00  Show Profile  Visit Laurie's Homepage  Reply with Quote
G'day zen!! How are things?

The ones I have are the JRC4558D... single "D"
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zentropa
Gold Member

USA
837 Posts

Posted - 04/01/2009 :  17:12:24  Show Profile  Send zentropa an AOL message  Reply with Quote
heya Laurie.

things are goin okay. barely played any guitar over the past 6 months or so but have some friends who are getting going and it's revived my interest for the time being.

was mainly asking hot tubes in terms of the "are they any better than stock production units?" question. it's not like any op amp is necessarily craptastic (unless you are thinking in audiophile terms like signal to noise ratio), but some can do what you want while others can't.
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leslav80
Copper Member

15 Posts

Posted - 04/01/2009 :  17:23:58  Show Profile  Reply with Quote
I have a question - which ones are better these with DD or these with single D ??
Does anyone know what is a difference between them?

Thanks
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zentropa
Gold Member

USA
837 Posts

Posted - 04/01/2009 :  17:38:37  Show Profile  Send zentropa an AOL message  Reply with Quote
DD's are smoother with more gain/dirt and less "boost" feel.

D's are harsher with more bite. less gain but more "boost" feel.

imo, DD's are a lot friendlier in solid state setups (less ear gouge). D's are better for note definition and a lot of attack but practically require a tube amp.

not really a question of better, more a question of "better suited for."
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