This is a rare product that has very little variations in quality, and has been carefully selected by a small company to take care of the product. Enjoy the tone change due to different manufacturers. 6J5P home Russian sphere commonly used in Chinese amplifiers. The K and G3 are independently pulled into the pin, so if you can handle the second pin on the amplifier side, you can use it as a replacement for 6J1 or 6K4. (If the socket has 2 and 7 conduction, you can use it as is. ) Enjoy the sound change. Compared to Chinese spheres, the getter is not only flying in the top of the head but also has a large amount of getter on the side and it is said to hold high vacuum for a long time. After 24 hours of aging, we check the vacuum tube tester TV-7/U, and we will send a signal from the oscillator with a real machine. Product photos are for illustration purposes only. Logo, etc. will vary depending on the production and lot. We do not accept returns or exchanges based on your preference of tones. Heater rated for Vf 6.3 Volts / If 0.45 Ampere. Please check the capacity of the adapter before making a purchase. 2A or above will not be a problem.