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I used to have an SP-6b preamp which I loved. The factory tubes were Chinese and very similar, if not identical to these. Having recently purchased a very early SP-6a recently, I purchased and installed the Shuguang tubes, and the sound is now identical to the 6b as I rememberit (I have also upgraded some capacitors). The tubes came within the time period stated, and were well packed with padding in each tube box, and padding betwen those boxes and the shipping box. I will not hesitate to buy from these folks again.
Verified purchase: Yes
Good sounding tube and looks to be well made. The tube I received looks a little different from my 'Mesa/Boogie' tubes,but is an exact match with my Chinese Groove Tubes. I would purchase this Ruby tube before I would spend the money on a Chinese Grove Tube. I would have no problem using this Ruby tube in my VS1 position. Good deal!
Verified purchase: Yes
i only recently found out about shuguang tubes. very impressed they're able to make tubes as inexpensive as this... and they sound fine. I'll definitely purchase them again
Verified purchase: Yes