This is the HOT (Horizontal Output Transistor) for your TV. There are several part numbers that can cross over as a replacement. This should be done only if the original RCA part number is no longer available however. I Googled your "RCA 23740" and got result pages with several compatible part numbers from Sony, ISC, etc. Then I clicked "Shopping" on Google's result page and found 3 sources for the exact RCA branded part ranging in price between $6 and $12. If you dug around the regular result pages I'm sure you'd find plenty more sources as well.
A few words of caution: This transistor is associated with the flyback transformer circuit. The flyback transformer is the source for high voltage - and can result in a painful shock or burn if the circuit has not discharged completely before contacting it. Use caution.
I hope this helps & good luck! Please rate my reply - thank you.
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Look at the original transistor, and give the numbers. For example, 2SD578, 2SC5148, or BUH517, etc. I may be able to cross this number for a replacement. RCA parts are getting very difficult to find. Also, is this a CTC 203 model#?
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