RO Real-Tube Guitar Preamp PUBLIC

Richter Original Real-Tube Guitar Preamp with 2-Band Tone

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, Feedback, and Volume. Treble switches have 3-positions; off, 1, and 2. The tube is a 12U7 twin triode (not 12AU7), designed to be used with a +12VDC supply-voltage on the plates AND heaters. [Do not use any other tube, including 12AU7.] Experimental circuitry. Untested design. No simulation. Frequency response and overall gain must be confirmed while beadboard testing. Calculated Frequency Range 20 Hz to > 20 kHz with all controls at 50% and all switches open. Calculated Gain = +20 dBV (Vo/Vi = 10) with all controls at 50%. The tube is available at The Tube Store. https://www.thetubestore.com . Power-supply not shown. Requires a regulated single-polarity DC supply providing +12V @ >= 170 mA. Example: Jameco DCU120020-G2421, 12V, 200mA, 2.4W. DigiKey # 5942-DCU120020-G2421-ND. $10.52. Available at https://www.digikey.com .