Tube QUADll power amplifier
Source: InternetPublisher:吃掉星星 Updated: 2017/12/26
![电子管QUADll功放](http://www.eeworld.com.cn/circuit/upload/538a1bc8a409ff500dc8e0cb6c6d7ecb/680c3da4-3c64-11ec-b098-086126841eb8.jpg)
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