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Project Brief: Stereo Tube Amplifier Design (From Scratch)
The goal of this project is to design a complete stereo tube amplifier from scratch, with a focus on proper engineering, stable operation, and high-quality audio performance. The design should be practical to build and test, with clear documentation and predictable results.
Given Requirements / Constraints:
Preamp: 1 × 6SN7 (shared between both channels)
Power stage: 2 × 6V6 (one per channel, single-ended)
Rectifier: 5U4
Power transformer: Hammond 272DX (144mA B+ max)
Output transformers: Custom, 5kΩ primary, 55mA max, gapped for 20Hz–20kHz HiFi use
Input signal: 1–1.5V nominal (2V max line level)
Target output: ~5W per channel at 2V input
Voicing: Final tonal shaping can be adjusted via coupling capacitor selection
Scope of Work:
Full circuit design of the preamp and power stages
Proper biasing of all tubes (preamp and power)
Power supply design including rectification and filtering
Gain structure design to meet input/output targets
Operating point calculations and validation
Integration of all stages for stable and optimal performance
Deliverables:
Complete, clean schematic (build-ready)
Clearly defined component values and operating points
Notes on design choices and expected performance
Guidance for implementation, testing, and initial troubleshooting
Objective:
To create a well-balanced, reliable amplifier design that meets the specified performance targets, minimizes distortion and noise, and avoids iterative trial-and-error during the build process.
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Electronic Engineer Needed for PCB Design & Embedded Systems Project
I'm looking for an experienced Electronic Engineer to help develop a custom hardware project from concept to production.
Project Scope
Electronic circuit design
Schematic capture
PCB layout (2–6 layers)
Component selection and BOM creation
Embedded firmware development (ESP32, STM32, Arduino, or similar)
Prototype testing and debugging
Manufacturing-ready Gerber files and documentation
Required Skills
PCB design using Altium Designer, KiCad, EasyEDA, or Eagle
Analog and digital circuit design
Microcontroller programming in C/C++
Knowledge of power supply, communication protocols (I2C, SPI, UART, CAN), and debugging tools
Experience preparing designs for manufacturing
Nice to Have
IoT product development
Wireless modules (Wi-Fi, Bluetooth, LoRa)
3D enclosure design
EMC/EMI and signal integrity knowledge
Deliverables
Complete schematic files
PCB layout files
Gerber files
Bill of Materials (BOM)
Firmware source code
Documentation for manufacturing and assembly
Please share examples of similar electronics or embedded systems projects you've completed, along with the tools you use and your estimated timeline.
Interested
The design looks great, but it could be even better if you were to make the main black color a little lighter in my opinion. Great work!
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