I have a question on the Tone amp board used in many early 22xx receivers and integrated amps. Usually it's PCB400 but can have a couple other numbering schemes. I have seen the same board used in 1060, 2230, 2245, and 2270 and I bet it used in others (2225?).
My question relates to the transistors.
H403, 404, 407 & 408 are shown as PNP transistors on the schematic, and I know that KSA992 (a PNP transistor) works as a replacement. But the original transistor is 2SC493. I thought the "2SC" designation indicates an NPN transistor (according to the JIS specification). Can anyone clear this up for me? Thanks.
My question relates to the transistors.
H403, 404, 407 & 408 are shown as PNP transistors on the schematic, and I know that KSA992 (a PNP transistor) works as a replacement. But the original transistor is 2SC493. I thought the "2SC" designation indicates an NPN transistor (according to the JIS specification). Can anyone clear this up for me? Thanks.