2SC2688 / C2688 NPN Silicone Transistor, TO-126 Package with ECB lead layout. Color TV chroma output circuits. Electrohome GO7 monitor chassis X901. This transistor is higher rated and can be used to replace the 2SC3502, KSC3502E, 2SC4001, 2SC2611, 2SC2371, BF457, BF458 & BF459. NOTE: The 2SC2688 can replace the 2SC3788 or the 2SC3956 if you install the 2SC2688 in reverse / opposite the 2SC3788 / 2SC3956 since the 2SC3788 / 2SC2688 has lead layout of BCE and the lead layout of the 2SC2688 is ECB.