If the battery can not be charged even with a seperate 18650 charger, we are afraid the battery may be faulty. You can consider to change four batteries.

@jlemaster1957

There is no reset hole on C9. Do you mean this hole(below picture showed)? It is a light hole. This hole do not have the reset function.

In this case, the batteries cannot be charged inside C9. Please remove the batteries and charge them with a separate 18650 charger. If they also cannot be charged on the 18650 charger, we are afraid the batteries need to be changed.

Hi sir, C9 cannot be used as a preamp. It has Pre in but not Pre out function.

hi sir, if you cannot find a battery to replace, you can consider to ship it back us. Please contact with the address service@cayin.cn.

Thanks Jeff. In early production HA-300MK2 was produced 115V/230V Dual Voltaged. As for the ones we shipped to USA they are 115V ones. However as we got reports from our US Distributors and Customers that in USA for some areas the voltage can go as high as 117V or even 120V. Under such case it...

Hi Jeff, about your questions: 1. The current from 22DE4 or 6SN7 is too small to damage the amplifier. 2. There is HV fuse to protect HA-300MK2 from being damaged when 300B tube is failed. 3. About 6SN7 tubes, GT, GTA and GTB versions are ok.

Thanks for your information. Did you root your N8ii? This problem generally appears if you root N8ii. To solve the problem, I'm afraid you need ship your N8ii back to reinstall the firmware.

Hi WDitters, we had published v1.5EN on our website. It is in the Support--Firmware/Driver Downloads--Personal Audio https://en.cayin.cn/drive/9/18/579.html

Hi gazzington, could you please take a picture to show me what the screen displayed before you press the power button to carry on? I mean the screen you described

According to your description, it seems that you did not turn on the function. It is in the Settings--Display--Advanced--Keep sampling rate indicator light on when powered on

We are applying for the certification of ROON. There will be firmware update after we get the certification. It might take a little more time, sorry for the inconvenience.

Dear RU6 users, we have recently updated the Windows USB Audio Driver for RU6, it enhanced compatibility with more Windows 10 PCs, please head to the following link to download, https://en.cayin.cn/drive/9/18/484.html

N8ii V1.5EN Firmware Update Hey guys, we have published the V1.5EN firmware for N8ii, you can either update your N8ii through OTA or head to our official website to download the firmware. changelog: 1. Enhanced compatibility of 16x MQA unfolding with third-party applications such as Tidal; 2...