6N6P-IR (6H6П-ИP) is a high durable tube with extra long service life. Tube was designed for low frequency power amplification in pulse mode. It is direct replacement for the Chinese 6N6 tubes and it is also very close to the ECC99, but with different pinout. It is close to the E182CC too, but it is not a direct replacement. New old stock tubes. Will be delivered in modern white boxes. Tested.