211 VT-4C Good Simple SE Schematic

Is there a recommended schematic for the 211 / VT4C similar to the Air Tight ATM-211? It would be preferable if it does not include an interstage transformer and 6SN7.

The request pertains to the design of an audio amplifier circuit utilizing the 211 (VT4C) vacuum tube, with a specific interest in a configuration akin to the Air Tight ATM-211 model. The inquiry emphasizes the desire to avoid the complexity of an interstage transformer and the use of the 6SN7 tube, which is commonly employed in many high-fidelity audio applications for its excellent linearity and low noise characteristics.

In designing a schematic for a 211-based amplifier, it is essential to focus on the tube's operating characteristics, including its high voltage and current requirements. The 211 tube can be configured in a single-ended or push-pull arrangement, but for simplicity and to adhere to the request, a single-ended design may be more suitable.

The amplifier circuit should include a power supply section capable of providing the necessary high voltage, typically around 300-400 volts, along with a separate filament supply for the 211 tube, which usually requires 5 volts at a few amps. The input stage could utilize a high-gain driver tube that does not include the 6SN7, such as a 12AX7 or a 6SL7, which can provide adequate signal amplification while maintaining fidelity.

Coupling capacitors will be necessary to block DC while allowing AC signals to pass through, ensuring that the audio signal is not distorted by the DC bias of the tubes. Output transformers are also critical in this design, as they convert the high-voltage signal from the tube to a lower voltage suitable for driving speakers. Selecting a high-quality output transformer designed for 211 tubes will significantly impact the overall sound quality.

Feedback could be implemented in the circuit to enhance linearity and reduce distortion, although the specific method of feedback should be chosen carefully to avoid introducing unwanted phase shifts.

Overall, the schematic should be meticulously laid out, ensuring that all components are rated appropriately for the voltages and currents they will encounter. Proper grounding and layout practices will also be critical to minimize noise and maintain signal integrity throughout the amplifier's operation.Hi, does somebody have a good 211 / VT4C schematic like Air Tight ATM-211 to recommend ? If it`s possible without interstage transformer and 6SN7.. 🔗 External reference