2SC1815 / KSC1815 NPN LF Audio Frequency General Purpose Amplifier TO-92 Package. Electrohome G07 Chassis X701, X101, X103, X105, X304, X301, X305, X302, X306 & Wells Gardner K4600 & K4700 at TR302, TR303, TR304, TR307, TR308, TR353, TR501 Wells Gardner K4900 at Q201, Q202, Q206, Q207, Q208, Q209, Q210 and Q301 and many more locations and other monitors. The 2SC1815 C1815 can sub for the 2SC1685, 2SC1685(R), 2SC454, 2SC1740Q, 2SC1740R, 2SC1740, 2SC536NP and 2SC2458. Wells Gardner k4600/k4700 has TR303 listed as 2SA1740 but its misspelled and should be 2SC1740 so the 2SC1815 is the correct replacement for it. Wells Gardner k4900 has Q209, Q210 and Q301 listed as 2SC1851GR but its misspelled and should be 2SC1815 so this 2SC1815 is the correct replacement for it.