Vented 2a3p 2a3pp-15w Tube Amplifier circuit diagram

The Elliot 2A3PP line amplifier is a straightforward design, emphasizing the quality of the output transformer. It utilizes a 3KPP output transformer with a fixed bias of 62V, delivering an output power of 15W. The 2A3PP is well-suited for speakers with a sensitivity of 88dB or greater. Recommended components include single-ended Western Electric capacitors and Sibi electrolytic capacitors, along with AB carbon resistors, all grounded properly. The power connection involves rectification followed by the first stage, utilizing a 10µF Sibi oil capacitor. The capacitors in the tube rectifier circuit play a crucial role in protecting the rectifier and ensuring sound quality. The assembly process requires careful attention to the welding of the first filament loop and the signal path. It is important to check that the operating points at all levels are correct and that grounding is properly established. The amplifier can be paired with a 2A3SE preamp and auditioned with KEF 105 Series 2 monitors. Listening tests reveal a remarkable soundstage and control over bass frequencies, challenging the notion that only high-power amplifiers can drive demanding speakers effectively. The 2A3PP presents a compelling option for DIY audio enthusiasts.

The Elliot 2A3PP line amplifier circuit is designed for optimal performance with low-power tubes, specifically the 2A3, which is known for its warm sound and musicality. The 3KPP output transformer is a critical component, as it influences the overall sound quality and efficiency of the amplifier. The fixed bias of 62V is set to ensure that the output tubes operate within their optimal range, allowing for a maximum output power of 15W. This power level is particularly effective when paired with speakers that have higher sensitivity ratings, making the amplifier suitable for a wide range of audio applications.

The selection of components is vital for achieving the desired sound characteristics. The use of high-quality electrolytic capacitors, such as those from Sibi, contributes to the amplifier's performance by minimizing distortion and enhancing the clarity of the audio signal. The AB carbon resistors are chosen for their stability and low noise characteristics, further improving the amplifier's overall sound quality.

In constructing the circuit, special attention must be paid to the layout and grounding. Ground loops can introduce noise and affect the performance of the amplifier, so a star grounding method is often recommended. The power supply section includes a rectification stage that converts AC voltage to DC, followed by a filtering stage using a 10µF oil capacitor. This capacitor not only smooths out the DC voltage but also plays a role in protecting the rectifier tube from high inrush currents.

Welding the components requires precision to ensure reliable connections. The filament circuit should be completed first, as it is crucial for the operation of the tubes. The signal path should be carefully routed to minimize interference and maintain signal integrity. After assembly, the operating points should be measured and adjusted as necessary to ensure that the amplifier functions correctly and safely.

In testing, the 2A3PP amplifier demonstrates its capability to drive the KEF 105 Series 2 monitors effectively, showcasing a three-dimensional soundstage and impressive bass control. This performance is particularly notable given the amplifier's modest power output, challenging the conventional wisdom that high wattage is necessary for driving complex speaker loads. The 2A3PP is not only a functional amplifier but also an excellent project for DIY enthusiasts looking to explore high-fidelity audio reproduction.Elliot vented 2A3PP line, is also very simple, the key is the quality of the output of cattle. Use 3KPP output cattle, fixed bias (a 62V), output power 15W. 2A3PP suited for th e promotion of the sensitivity of 88dB or more speakers, electrical components or select a single Western Extension, Sibi electrolytic capacitors, AB carbon resistor, is still the star grounded. Power connection, after rectification of the first stage with a capacitance of 1O Sibi oil capacitors, the capacitors used in the tube rectifier circuit effect is significant, can protect the rectifier guts, but also to ensure sound.

Welding installation weld pressure and also the first filament loop and then welded the signal path on the line. Check whether the normal operating point at all levels, the ground levels are correct, and finally connect Bu 2A3SE pre-GP18, audition this time with a KEF 1O5 sE-RIES-2 monitors.

Tsai is also broadcast old songs and other tracks, but it is completely different feel: the sound field through the wall through the three-dimensional wall not heard before, even KEF that a 1O5 notoriously difficult to control bass are tame ease, and rhythmic unambiguously. Like force of the sound field is very beautiful, broadcast Tony Nine actually have enough control, people can not believe it is a 15w after the 2A3 level in promoting a 1O5 KEF speakers, you know a lot of people with a 200W stone push it machines well, 2A3PP really worth a good DIY machine!