① Use the new UPC2581V.
② Using the Tested Paired New Sanken 2SC2922/2SA1216 Transistor.
③ Circuit: UPC2581V + push the pipe + SANKEN high power tube structure, the circuit is simple, stable, very transparent sound. The push tube adopts the new ON power tube pair MJE243/MJE253 (100V/4A/15W/40MHz), and the driving quiescent current is designed to have a high current of 20mA.
④ Balanced wiring: The Sanken transistor has a high output current, and it is recommended to use this board for fully balanced bridging, as the output power of the bridging circuit is 4 times that of a conventional one. It is recommended to appropriately reduce the power supply voltage; When the bridge is powered by AC30V, the output power is 8 Ω/200W and 4 Ω/400W. Adopting an independent power supply protection board, it is flexible in combination and easy to arrange the space.
⑤ Class A current: This circuit design has adjustable final static current. When the temperature of the transformer and radiator allows, try to increase the static current as much as possible to feel the charming charm of Class A power amplifier (warm, transparent, and well controlled)!
Recommended voltage: Regarding the adjustment of Class A, the static current of the final stage of this power amplifier board can be adjusted to achieve ideal sound quality. It is recommended to use a matching heat sink: when powered by DC ± 48V, it is recommended to adjust each pair of tubes to 100mA; When powered by DC ± 35V, it is recommended to adjust the static current to 200mA.
Output power: According to the difference in power supply voltage and horn impedance, the output power is 20W~150W
PCB size: 183 * 59MM
Mid point voltage: about 0.3mV
Gain: 68K/2K2+1=32 times
Signal to noise ratio: 110dB
Noise level: about 0.2mV
Tip: The radiator needs to be purchased separately. We have a suitable radiator, if you need it, please contact me. Thank you
Logistics information
Our products are located in Hong Kong, China, and the logistics speed depends on your specific location. According to our experience, it usually takes about 15-20 days of transportation time
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How to choose the correct size:
Step 1 Please measure your foot length carefully.
Step 2 Please choose the correct size according to your foot length and chinese size.
For example, If your foot length is 255 mm , you should choose the size 8.
