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Home Electronic Component Chips Sensor Arduino Module Raspberry Pi 25W 6J1+LM1875 HiFi Vacuum Tube Preamplifier Board Stereo Audio Preamp Headphone Popular Popular Product Introduction Description: 1: Widely used 2: 6J1 school sound, soft and sweet sound 3: 2-channel stereo 4: Overheating DC short circuit protection 5: Simple to use and easy to understand Configuration details parameters Power supply voltage: AC12-18VX2 (double AC) Power supply: not less than 30W and above 50W is better Output power: 30WX 2 MAX. Output impedance: 4-16 ohms Channel: 2 channel stereo Circuit architecture: 6J1 front stage + LM1875 rear stage Features: 6J1 school sound, soft and sweet sound Protection feature: overheating DC short circuit protection Size: Approximately 125*120*55mm Net weight: about 393.5g important hint 1. The power depends on the power supply and speaker impedance, THD=1%, RL = 8Ω, VS = ±25V, Po=25W; 2. LM1875 has been discontinued, using the old stock white genuine 1875; 6J1 tube has also been discontinued, using stock products, the brand may be shipped randomly from brands such as Shanghai, Beijing, and Shuguang; 3. Please pay attention to monitor the temperature of the heat sink during use, if necessary, it is recommended to use a fan to assist heat dissipation; 4. The design size is for reference only, and there is a deviation from the actual product, please refer to the actual product. It is recommended to use dual 18V transformers for the power amplifier board, if dual 12V is used Transformer, please short the jumper point on the back of the circuit board. Package listing: 1*Power amplifier finished kit Payment Shipping Refund Payment We accept PayPal only. But we only Accept your Ebay Address ,Please Make sure it's 100% right. Payment must be received in 5 business days of auction closing. Please leave note for your special request (e.g. Colors or Size) in PayPal when you pay the order. Any special request cannot be accepted after 24 hours of payment, because most of orders will be processed instantly and same day dispatched. Shipping We maintain high standards of excellence and strive for 100% customer satisfaction! Feedback is very important to us. We request that you contact us immediately BEFORE you give us neutral or negative feedback, so that we can satisfactorily address your concerns. Refund All package need to wait 30 days (US only n eed 7-10 days) , Please take care it.Less than 30 days,we can't take a refund . If the item is defect when you receive it or you are not satisfied with it, please return it within 14 days for a replacement or money back. But the items must be back in factory condition. Please contact us and double check the return address before you return it. If is item is defective in 12 months, you can return it to us. We will send you a new replacement after receiving the defective item. Home Electronic Component Chips Sensor Arduino Module Raspberry Pi 25W 6J1+LM1875 HiFi Vacuum Tube Preamplifier Board Stereo Audio Preamp Headphone Product Introduction Description: 1: Widely used 2: 6J1 school sound, soft and sweet sound 3: 2-channel stereo 4: Overheating DC short circuit protection 5: Simple to use and easy to understand Configuration details parameters Power supply voltage: AC12-18VX2 (double AC) Power supply: not less than 30W and above 50W is better Output power: 30WX 2 MAX. Output impedance: 4-16 ohms Channel: 2 channel stereo Circuit architecture: 6J1 front stage + LM1875 rear stage Features: 6J1 school sound, soft and sweet sound Protection feature: overheating DC short circuit protection Size: Approximately 125*120*55mm Net weight: about 393.5g important hint 1. The power depends on the power supply and speaker impedance, THD=1%, RL = 8Ω, VS = ±25V, Po=25W; 2. LM1875 has been discontinued, using the old stock white genuine 1875; 6J1 tube has also been discontinued, using stock products, the brand may be shipped randomly from brands such as Shanghai, Beijing, and Shuguang; 3. Please pay attention to monitor the temperature of the heat sink during use, if necessary, it is recommended to use a fan to assist heat dissipation; 4. The design size is for reference only, and there is a deviation from the actual product, please refer to the actual product. It is recommended to use dual 18V transformers for the power amplifier board, if dual 12V is used Transformer, please short the jumper point on the back of the circuit board. Package listing: 1*Power amplifier finished kit Payment Shipping Refund Payment We accept PayPal only. But we only Accept your Ebay Address ,Please Make sure it's 100% right. Payment must be received in 5 business days of auction closing. Please leave note for your special request (e.g. Colors or Size) in PayPal when you pay the order. Any special request cannot be accepted after 24 hours of payment, because most of orders will be processed instantly and same day dispatched. Shipping We maintain high standards of excellence and strive for 100% customer satisfaction! Feedback is very important to us. We request that you contact us immediately BEFORE you give us neutral or negative feedback, so that we can satisfactorily address your concerns. Refund All package need to wait 30 days (US only n eed 7-10 days) , Please take care it.Less than 30 days,we can't take a refund . If the item is defect when you receive it or you are not satisfied with it, please return it within 14 days for a replacement or money back. But the items must be back in factory condition. Please contact us and double check the return address before you return it. If is item is defective in 12 months, you can return it to us. We will send you a new replacement after receiving the defective item. On Sep 24, 2023 at 20:53:27 PDT, seller added the following information: