Hi-fi amplifier 80Wx2

The 2SC2987 and 2SA1227 transistors are used in the uPC1342V circuit, which is a two-channel high-power amplifier capable of delivering 80W using two tubes in the discharge circuit. This circuit incorporates a multifunction protection feature similar to the PC1237 circuit. A detailed table lists factory-recommended output power settings for the tubes, ranging from 25W upwards. Additionally, alternative output tubes such as Sanken models (2SA1216, 2SC2922, and 2SA1292) or others like 2SC3264 may be utilized. In cases where lower-quality tubes are needed, options like IVU2955 or 2N3055 can be considered. The uPC1342V circuit requires the addition of a 60mm x 60mm x 1.5mm aluminum radiator for thermal management. It also features an indirectly adjustable bias circuit, with an adjustable resistance of 51 ohms for setting the quiescent current of the output tubes, typically around 100mA. The circuit includes a compensation capacitor connected to pin 7, with a maximum capacitance of 100pF. If the circuit operates without self-excitation, it is advisable to reduce the capacitance of the compensation capacitor. To optimize the performance of the high-fidelity amplifier, the power transformer should have sufficient capacity, and the filter capacitor should be no less than 10,000uF. Additionally, the resistance in the power supply should be minimized.

The uPC1342V circuit is designed as a high-fidelity audio amplifier, emphasizing both performance and reliability. The use of the 2SC2987 and 2SA1227 transistors allows for efficient amplification of audio signals, with a focus on maintaining low distortion levels. The inclusion of a multifunction protection circuit, akin to the PC1237, is critical for safeguarding the amplifier from potential damage due to overcurrent or overheating.

The recommended output power settings listed in the accompanying table serve as guidelines for optimal performance, ensuring that the amplifier operates within safe limits while delivering high-quality sound. The versatility in tube selection, including Sanken and other brands, provides flexibility in sourcing components and allows for adjustments based on availability and cost considerations.

Thermal management is addressed through the specified aluminum radiator, which dissipates heat generated during operation. The indirectly adjustable bias circuit contributes to the stability of the amplifier, allowing for fine-tuning of the quiescent current. This adjustment is essential for achieving a balance between performance and thermal efficiency, preventing overheating while maintaining sound quality.

The compensation capacitor's role in stabilizing the circuit is vital. By fine-tuning its capacitance, the circuit designer can mitigate the risk of oscillations, ensuring smooth operation. The emphasis on a robust power supply, with a sufficiently rated transformer and filter capacitor, is crucial for sustaining the amplifier's performance under varying load conditions. Minimizing resistance in the power supply further enhances efficiency, ensuring that the amplifier can deliver its full power potential.

Overall, the uPC1342V circuit represents a well-engineered solution for high-power audio amplification, combining advanced circuit design with practical component choices to achieve superior sound reproduction.2SC2,987,2SA1227 is uPC1342V and two-channel hi-power 80W 2 tubes of the discharge circuit o The circuit uses the same multi-function protection circuit t {PC1237 circuit for f ull-featured protection o Table 2-34 lists factory recommended when used in different output power output on the tube, from 25W up llow. Except listed in the table on the tube outer race may be employed Sanken fever on the tube as the output tube, such as 2SA1216,2SC2922, or 2SA1292.2SC3264 like.

Article pieces can also be used when you do not approve of cheap quality pipe IVU2955 2N3055 tube. LrPC1342V need to add in the use of 60 60 1,5mm aluminum radiator circuit 78 foot o indirectly adjustable type bias circuit, the circuit is powered, adjustable 51m adjustable resistance tube quiescent current in the output lOOmA about 06, between 7 feet to compensate for the capacitance of the capacitor connected, maximum capacity of 100pF. If the circuit works well without self-excited, should try to reduce complement compensation capacitor capacity.

In order to give full play to the function of high-fidelity amplifier, power transformer capacity should be large enough capacity filter capacitor also should not be less than lOOOOLeFo power of resistance should be as small as possible.