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How flat is the freq response of the A12?

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How flat is the freq response of the A12?

Postby mojojo » Thu May 28, 2009 11:19 am

I bought mine from eBay. It starts to decrease output at 5K.
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Postby tpryan » Sun May 31, 2009 9:39 pm

Assuming your measurements are correct, there's definitely something wrong with it. What caps are installed at C1, C6, and C20-C22?
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Postby tpryan » Mon Jun 01, 2009 5:43 pm

Referred to +4dBu @ 1KHz and 40dB of gain, frequency response is -0.3dB at 20Hz and 20KHz; -3dB at <5Hz and >65KHz. Installing a 1500pF at C6 by mistake would put response down about 3dB at 5KHz. You may also have a bad op-amp.
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Just observing

Postby innerpeaz » Sat Aug 15, 2009 10:31 am

I am so impressed that you take the time to reply to questions like this. You have convinced me to buy. I wish more company founders/presidents/CEO were like yourself. America used to be like this.
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