Welcome to diyAudio Jan 
If its an RIAA preamp then you are probably best posting the question over in the Analogue Line Level forum. This is for intros really.
If an opamp is an unknown then you can make a guess by checking the power supplies which will be on pins 4 and 7 for a single and pins 4 and 8 for dual opamp. RIAA stages probably use a low noise bipolar rather than FET device. Typically this would be an NE5532 which was the industry standard.
If its an RIAA preamp then you are probably best posting the question over in the Analogue Line Level forum. This is for intros really.
If an opamp is an unknown then you can make a guess by checking the power supplies which will be on pins 4 and 7 for a single and pins 4 and 8 for dual opamp. RIAA stages probably use a low noise bipolar rather than FET device. Typically this would be an NE5532 which was the industry standard.
Please do not post more than one thread on any given topic or that topic to more than one forum. If you post to the wrong forum please ask us to move it. Thank you.
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