Amplifier Dubel Tegen Koppeling Oldschematic

The amplifier circuit in the black and white electrical diagram you sent is a transformer-coupled push-pull amplifier. It utilizes transformers and multiple tubes to amplify an audio signal for driving loudspeakers. Here’s a breakdown of its potential design and functionalities:

Amplifier Stages (Based on Schematic):

• Input Stage (V1a: 12AX7): The first triode section of the 12AX7 tube (V1a) amplifies the weak input signal from your audio source (e.g., turntable, phone).
• Coupling Capacitor (C1): Blocks DC voltage from the previous stage while allowing the AC audio signal to pass to the next stage.
• Grid Resistor (R1): Sets the input impedance of the first triode section and affects gain.
• Cathode Bypass Capacitor (C2): Improves AC signal fidelity and stability in the first triode section.
• Phase Inverter Stage (V1b: 12AX7): The second triode section of the 12AX7 tube (V1b) inverts the phase of the amplified signal. This is a common technique in push-pull amplifier designs to drive the output stage more efficiently.
• Coupling Capacitor (C3): Blocks DC voltage from the previous stage while allowing the AC audio signal to pass to the output stage.
• Driver Stage (V2a & V2b: 6SJ7): The two 6SJ7 tubes (V2a and V2b) likely function as a voltage amplifier stage, further increasing the signal strength before the output stage.
• Interstage Transformer (T2): Couples the driver stage to the output stage, transforming the voltage and impedance levels to efficiently drive the push-pull output tubes.
• Output Stage (VT2a & VT2b: 2A3): The two 2A3 tubes (VT2a and VT2b) are connected in a push-pull configuration, a common design for power amplifier stages in transformer-coupled amplifiers. This configuration utilizes both the inverted and non-inverted signals from the phase inverter stage to improve efficiency and reduce distortion.
• Output Transformer (T3): Matches the impedance of the push-pull output stage to the speakers for efficient power transfer and optimal sound reproduction.
• Power Supply (Not Shown): The schematic doesn’t depict the power supply section, but a complete amplifier would include a power transformer, rectifier tube (likely), filter capacitors, and voltage regulator circuits to provide the necessary DC voltages for each stage of the amplifier.

Key Points:

• Transformer-coupled push-pull amplifiers are known for their potential for high-fidelity sound reproduction. The transformers help to isolate stages, minimize noise, and improve overall audio quality.
• This is a simplified explanation based on the visible components in the schematic. A complete understanding of the amplifier’s operation would require the entire circuit diagram, including the power supply section and component values.
• Building a tube amplifier requires expertise and knowledge to handle high voltages safely. Always refer to a verified and complete schematic diagram for accurate component selection and assembly instructions.

Safety Reminder:

Tube amplifiers operate with dangerous voltages. If you’re working with this amplifier circuit, exercise caution and follow proper safety precautions as you would with any high voltage equipment. Consider consulting with a qualified professional if you’re not comfortable working with electronics and high voltage systems.

Additional Notes:

• The terms “dubel tegen koppeling” directly translate to “double counter coupling” in Dutch. This might be a reference to the push-pull output stage design where two tubes operate in a complementary fashion.
• Due to the incompleteness of the schematic (missing power supply section) and the absence of specific component values, a complete bill of materials cannot be provided.