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Line to Phono converter
Old 21st June 2019
  #1
Here for the gear
 

Line to Phono converter

Hello!

My girlfriend has given me a USB powered turntable which only has a line level output, with no RIAA eq. (the entire quality of the thing is rather poor, but I am only concerned about the output).


Listening to an album using that output, and with no RIAA eq is not an option, it sounds bass-less.

I do have a pretty good phono amplifier though, with RIAA eq, so I was thinking about getting a Line to Phono converter (only to reduce the signal, with no RIAA eq applied) so that I can use my preamp.

This product is non-existent in my country, so I was thinking about building one myself. I understand electronics and circuitry to some extent, but I am a newbie.

Would it be difficult to build something like that?

I really was amazed at how difficult it was to find something that could do this.... specially in this age of cheaply-made USB turntables....

thanks in advance!
Old 24th June 2019
  #2
Gear Head
 
S_mask's Avatar
 

Turntables don't have audio outputs, although turntable motors might send feedback to a servo drive circuit that's external to the plinth.
Cartridges have audio outputs, and those outputs normally do need to be de-equalized.
If your USB turntable has a built-in preamp without EQ, it was designed for digitization before RIAA so that declicking is easier and the eq can be added after capture and cleanup. If you have such a preamp built in, perhaps you can bypass it so that you can just plug the cartridge into your phono preamp. It would require opening up the thing and finding where the cartridge leads are in order to splice them onto a little snake to get the signals to your phono preamp inputs.
Have you seen these boards: http://www.ka-electronics.com/kaelec.../PT_System.htm ?
Old 24th June 2019
  #3
Here for the gear
 

Quote:
Originally Posted by S_mask View Post
Turntables don't have audio outputs, although turntable motors might send feedback to a servo drive circuit that's external to the plinth.
Cartridges have audio outputs, and those outputs normally do need to be de-equalized.
If your USB turntable has a built-in preamp without EQ, it was designed for digitization before RIAA so that declicking is easier and the eq can be added after capture and cleanup. If you have such a preamp built in, perhaps you can bypass it so that you can just plug the cartridge into your phono preamp. It would require opening up the thing and finding where the cartridge leads are in order to splice them onto a little snake to get the signals to your phono preamp inputs.
Have you seen these boards: http://www.ka-electronics.com/kaelec.../PT_System.htm ?
Thanks for the answer, it was crystal clear.

So technically, if I use the line out that this turntable has and apply RIAA equalization to it (with another EQ), I could listen to the record as it should sound?
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