All of our vacuum tubes are directly come from the Shuguang Electron Group Co., Ltd. HunanChina; it is 100% factory price. No agent, distributor, or any mediators, etc. in between the buying process. All vacuum tubes are passed the strict quantity test of factory of Shuguang. Any tubes are come with a qualified certificate of the SHUGUANG factory.
If you purchase 2 items, we can offer a matched pair vacuum tubes (Matching fee is Free). If purchasing 4 items, we can offer Quad matched vacuum tubes (Matching fee is Free). The matched tubes are under a precise measurement and instrumentation of original factory of Shuguang factory.
Buyer Notice: This item is 1 PCS vacuum tube. Pair tubes stand for 2 tubes and Quad tubes stand for 4 tubes.