RO Real-Tube Guitar Preamp PUBLIC

Richter Original Real-Tube Guitar Preamp with Treble Boost

Richter Original real-tube guitar preamp with adjustable treble response. Controls Include: Input Level, Bass, Treble, Treble-Boost switch, Treble-Cut switch A, Treble-Cut switch B, Treble Slope, and Volume. Treble switches have 3-positions; off, 1, and 2. The tube is a 12U7 dual triode (not 12AU7; do not use any other tube, including a 12AU7). It is designed to be used with a +12VDC supply-voltage on the plates AND heaters. Experimental circuitry. Untested design. No simulation. Frequency response and overall gain must be determined during beadboard testing.
The tube is available at The Tube Store. https://www.thetubestore.com .
Power-supply not shown. Example Supply: 12V DC 1000 mA Regulated Switching Power Adapter, Product ID: 798. $8.95 each. Available at the AdaFruit website. https://www.adafruit.com .