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 Post subject: phono preamplifier
PostPosted: 25 Oct 2012, 04:12 
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Joined: 03 May 2011, 15:16
Posts: 188
Location: Romania,Iasi City
Hello! I have deck phono TESLA NC 430 with electromagnetic cartridge. The problem is that the amplituner which had the phono preamplifier is broken down.. Until now I haven't finished repairing it. Is there any problem if I mount in the phono a small preamplifier with LM387N and a transformer so at the output of DIN connector to have a liniar signal? I made a test and the only noise should be a little maybe from the motor of the phono.

I saw on the internet that there are some phonos with a cable coming out from them with 2xRCA. Do they have integrated preamplifier or not? Others have a DC motor and have a separate supply of 12V.

The phono is belt drive and has a UNITRA MF-104 cartridge (MM)

 Post subject: Re: phono preamplifier
PostPosted: 29 May 2013, 00:38 

Joined: 30 Apr 2013, 13:24
Posts: 49
As you mention your phono pre amp is broken and you want to mount a linear pre amp in its place? .The two dont go together as it sounds linear means a FLAT frequency response a phono pre amp has a non linear response to compensate for the way the LP is manufactured and the carts response to allow a flat frequency response. . A phone pre amp reverses the output from the cart. to allow a linear response its called a RIAA response. I do not know your deck but in the past 90% of decks required a RIAA pre amp to work properly its only in the last decade or two that built in RIAA pre amps were built into decks and that is for using to transfer an LPs sound to a PC for conversion to a CD or other form of digital music.

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