Simple tube amplifier with 2 x 6AV6, 1 x 6AR5, and 1 x 5MK9:
Configuration (Potential):
This setup could be a single-ended triode (SET) amplifier design with the following stages:
- Power Transformer: Supplies AC voltages for the amplifier circuits.
- Rectifier Tube (1 x 5MK9): Given the information from various sources, the 5MK9 is likely intended to function as a full-wave rectifier, converting AC voltage from the transformer to DC voltage for the entire circuit.
Important Note: While the 5MK9 is confirmed as a rectifier, a complete datasheet with detailed specifications is still recommended for definitive confirmation of its suitability in this role.
- Preamplifier Stage (1 x 6AV6): Amplifies the weak input signal from an audio source (e.g., turntable, phone).
- Driver Stage (Potentially 1 x 6AR5): The role of the 6AR5 in this configuration is less common. It might be used as a driver stage to provide additional voltage gain before the power amplifier stage (one of the 6AV6). However, some designs might omit the 6AR5 altogether and rely solely on the 6AV6 for preamplification.
Other Components:
- Output Transformer: Matches the impedance of the power amplifier tube to the speakers for efficient power transfer.
- Coupling Capacitors: Block DC voltage while allowing AC audio signal to pass between stages.
- Bypass Capacitors: Improve signal fidelity and stability.
- Resistors: Control voltage gain, current flow, and biasing of the tubes.
- Speaker: Converts the amplified electrical signal into audible sound.
- Chassis: Houses all the components.
Functionality (Simplified):
- AC voltage from the power transformer enters the 5MK9 rectifier tube, which converts it to DC voltage for the circuit.
- The weak audio signal from the source enters the preamplifier stage (6AV6). This stage amplifies the signal.
- (Optional) If a 6AR5 is used as a driver stage, the signal from the preamp is further amplified.
- The amplified signal is then fed to the power amplifier stage (one of the 6AV6 tubes). This stage significantly increases the signal’s power to drive the speakers.
- The output transformer takes the amplified signal and matches its impedance to the speaker for optimal sound reproduction.
- The speaker converts the electrical signal back into audible sound waves.
Important Considerations:
- Building a tube amplifier requires expertise and knowledge to handle high voltages safely. Always follow a proper circuit diagram and safety precautions when working with such equipment.
- The use of a 5MK9 in this configuration is not as common as using a standard rectifier like a 5Y3K. A datasheet for the 5MK9 would be ideal to confirm its exact specifications and ensure compatibility with the circuit.
- This is a simplified explanation. A complete tube amplifier circuit would involve additional components and design considerations for optimal performance and safety.
Safety Reminder:
Building a tube amplifier involves working with dangerous voltages. If you’re not experienced with electronics and high voltage systems, it’s strongly recommended to seek guidance from a qualified professional or purchase a pre-built amplifier for your safety.
