Below are the web sights where I got the schematic. Fred did a nice job of describing this so please use his web sight and view the artical on a studio tube pre amp. He had other nice articals as well.
This schematic was presented by Fred Nachbaur.
©1998 - 2004 by Fred Nachbaur. All Rights Reserved. This information may be freely used for personal, non- commercial use only.
Step 1: Disclaimer
While this document describes a plan to build an electronic device that has about 180 volts DC under the chassis caution must be followed. I will not be held responsible for any injuries incurred from some one following this document. Nor will I
MSH MODEL-1 PREAMP (Michael S. Holden) makes no representations about the suitability of this information for any purpose. It is provided "as is"
MSH MODEL-1 PREAMP (Michael S. Holden) disclaims all warranties with regard to this information, including all implied warranties of merchantability and fitness, in no event shall MSH MODEL-1 PREAMP (Michael S. Holden) be liable or any special, indirect or consequential damages or any damages whatsoever resulting from loss of use, data or profits, whether in an action of contract, negligence or other tortious action, arising out of or in connection with the use or performance of this information.
This information may include technical inaccuracies or typographical errors.
MSH MODEL-1 PREAMP (Michael S. Holden) may make improvements and/or changes in the information at any time.
Step 2: Power Supply
For a monaural circuit, the simple power supply detailed as part of the Standalone phono preamp and reproduced below should be entirely adequate. T1 and T2 are both 12-volt, 0.5-ampere units.