Audio-Technica AT-PEQ20 Phono Equalizer

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Hi,

Can anybody please assist with providing a schematic for the Audio-Technica AT-PEQ20 Phono Equlaizer?

I recently picked up a second hand unit only to find that someone has already tried to mod it and some parts are missing from the PCB and or perhaps not original - two resistors soldered in parallel is a bit of a dead give away?


Thanks 🙂
 
If it's like this pic you can compare vs your AT?
 

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AT-PEQ20 vs AT-PEQ3

Hi,

Thanks for your replies. I found the schematic for the AT-PEQ3 from somewhere else and looked carefully at the components used and the number of them.

Putting aside the MC preamp offered by the AT-PEQ20, the straight out MM RIAA stage seems to have a few more components in the feedback loop around the opamp.(The switch appears to switch out the MC preamp from infront of the MM RIAA stage of the AT-PEQ20)

In short the AT-PEQ20 would appear to be a different circuit from the AT-PEQ3?
I read somewhere that the AT-PEQ3 wasn't designed by Audio Technica, instead an out sourced design done by a Hong Kong OEM company that badge the product for Audio Technica.

I've surfed the net for a few days but can't find a macro shot close-up of an AT-PEQ20 such that I could figure out what the resistor and capacitor values are.
Thanks.View attachment AT-PEQ3.pdf
 
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