Update ONsemi Tube Amplifier Board 150W+150W HiFi Dual Channel Audio Amplifiers NJW0281G NJW0302G-Finished not Cooling

Ts: Due to the supply chain relationsh, UPC2581V chs are shped from oas warehouses in Ruia, and CXD9986L chs are shped from China. The functions are all the same.

Selling Point

Quiescent current adjustment: 1. The greater the quiescent current, the greater the heat generated by the tube, please adjust it to a smaller value if it feels too hot during use 2. The measurement must use a digital meter, the current is obtained by voltage conversion, such as measuring 10mv, the algorithm is 10/0.25=40ma 3. If there are no special requirements, the Kits or finished boards can be free of debugging, and they have been adjusted before shment. Basic summary: Sony CXD9986L+ push tube + ONSEMI tube structure, ON-NJW0281G/0302G, simple and compact design, stable and reliable, high-profile components of the whole board, sound transparent and durable, CXD9986L is a HiFi-level dual-channel pre-driver IC developed by Sanyo Japan for Sony. This IC is used by some of Sony’s tens of thousands of amplifiers. The input stage and the voltage amplifier stage, excluding the push stage, the internal twin transistors have excellent consistency, eliminating the trouble of poor pairing under amateur conditions, easily obtaining HiFi-level sound quality, and easily surpaing many famous phone lines. With stable quiescent current and ultra-low output midpoint, we have made special settings for DIY, so DIY is no longer complicated. Even if you buy parts, the initial static current of the welded board is around 50 to 60MA. It can be debug-free. If there is no watch and you want to use the tube amplifier just right, the board design has become a speaker protection function to protect the expensive speakers. Special Note: Considering the long-distance transportation of expre delivery, the large heat sink is not installed when the finished board is shped. If it is installed, it will easily lead to deformation of the pin or even pull off the copper pad. You only need to put it on the goods after receiving the goods. The mica sheet is equped with a few screws. It is recommended to apply silicone grease. Output impedance: 4 to 8 ohms Supply voltage: AC double 18V to double 35V, DC ±24V to ±42V Output power: MAX 150W+150W output, push the home floor box without preure. size: 155*80mm, after mounting the heat sink in the store is 155mm wide * 120mm length * 50mm hight Several questions that are often asked: 1; Want to add the former level? -- You can add a preamp or tone board, but you don't need to look at the individual. If you want to tune the ba, you can add a tonal preamp board. 2; Can the car be used? -- Yes, but add a power booster board to convert 12V to ±24V to ±48V, preferably ±30V or more. 3; Is there noise? -- Correctly installed a very quiet, defective board, even if I dare to sell, but the front guests do not accept it, rest aured, you are not the first to eat crabs. Installation precautions: 4 large tubes must be insulated. The paage is delivered in the paage. The heat sink is installed and commiioned. Please che whether the wiring is correct when testing. If the spare parts are miing, send them for free. The ONSEMI NJW0281G/0302G audio dedicated tube, each pair of tubes can output 150W effective power. BP, KZ belongs to the highest specification of Nichicon MUSE series, audio coupling, decoupling, minimum tangential lo, clean sound base, compact and powerful low frequency, outstanding mid-range texture, high-frequency smooth and pleasant. Left and right channel quiescent current measurement points, with MV DC voltage file, adjust blue to 15MV (15/0.25=60MA) Installed layout reference 1. When the board is installed, the input end of the board should be charged 2. Chais size road as shown in the figure below, the internal height is 55mm or more 3. Chais signal line uses shielded cable 4. The screw hole in the lower left corner of the board ensures that the housing is closed. Ts:The heat sink of the UPC2581 driver ch has white and bla colors and is shped by default.

About shping
Shping and Pa All it will be double cheed and well paed before sending.It will be dispatched within 2 business days after buyers pay for the order. It usually takes about 14 to 18 working days for delivering the paage to the destination(for e areas,it may take a little longer). 

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