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It is currently 18 Apr 2021, 14:50

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PostPosted: 28 Feb 2021, 16:34 
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Joined: 28 Feb 2021, 16:19
Posts: 1
Hello all!

I'm looking to connect an old record player with its original ceramic cartridge to a regular, modern-day "AUX input". At the risk of butchering the jargon, I think what I need is a pre-amp to properly convert the phono signal to 'regular consumer line level'.

As I understand it, the impedance of the ceramic cartridge is the most importart factor. The original listing for it specifies 1M Ohm, and if it's possible to measure impedance by using the ohmmeter on a cheap multimeter then I indeed measured 1.1M Ohm across the cartridge. When hooking the player up to the line input currently, it actually works relatively well because the signal is strong enough. The sound is quite tinny though. My expectation is that using a proper pre-amp that 'supports' the high impedance will alleviate this.

In addition, I think there should be RIAA curve correction. I don't suppose this is something that is addressed within the cartridge?

What's the best approach in general? Should I adapt a design for a magnetic phono pre-amp to work with a ceramic cartridge, adjusting the gain (much less) and somehow adjusting for the high impedance? Or is there a good design out there? Or is it doable to design a (preferably simple) pre-amp from scratch built around modern parts?

My goal is (unfortunately) not ultimate audiophile quality, but simplicity. The purpose is to make a record player that has sentimental value sound better and learn some skills along the way, but if this project were to explode in complexity then it will probably be abandoned before I can complete it.


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