Bottlehead Forum

General Category => Technical topics => Topic started by: vetmed on November 21, 2013, 12:05:51 PM

Title: DIY Phono amp
Post by: vetmed on November 21, 2013, 12:05:51 PM

I found this circuit on the web and am wondering what sort of current requirements are involved so that I might try my hand designing the power supply :)

Robert Lees

Title: Re: DIY Phono amp
Post by: Paul Joppa on November 21, 2013, 12:56:18 PM

I see three identical current sources (per channel), but I haven't designed with those FETs so I don't know what current they are set at. You can look up the tube data sheets to find the heater voltage and current draw. Here is (I believe) the most popular tube data sheet locator:

http://tdsl.duncanamps.com/

I have some misgivings about the RIAA, but it's not my design and I don't have time right now to study it carefully.