I have a Guitar amp that has two DIP8 ICs Which read:

458DD
JRC
5185B

What IC is equivalent? I have some OPA2132P, will that work?

 

Generally twin-opamps use the same pin connections, so you should be OK.

Are the opamps faulty or something?.

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http://www.winpicprog.co.uk

 

There was no sound at all. Ive replaced them and it seems to work now, although now there is a terrible buzz which i cant seem to get rid of.

 

Randomly replacing parts isn't a good method of fault finding, you need to trace the signal (or inject a signal) to find what's happening, and take voltage measurements to see what's wrong.

Opamps are VERY reliable devices, it seems extremely unlikely that two would fail? - unless something nasty has happened? (like too much supply voltage?).

__________________
PIC programmer software, and PIC Tutorials at:
http://www.winpicprog.co.uk

 

Yes, and the him/buzz you hear may have a LOT to do with why the original amps failed. Hum is normally eliminated by employing filter capacitors and good grouding.

How old is the unit? There is a chance, if the amp has been sitting idle for a long time in less than ideal conditions (a grarage), you have large filter capacitors with dried up electrolyte. This is a common repair on antique radios, for instance.

How much have you checked? Voltages? Cold Solder joints? etc...

PW