Omaha, NE
Generic 7905T type regulator with TO-220 package. Fortunately fairly common.
Modern Example = MC7905ACTG.
(Topic ID: 280880)
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Depends on Whose 7905CT.
ST Microelectronics - in all their wisdom, was using "T" in the suffix for their TO-3 devices. What you need is a TO-220 type package.
TO-3 = metal can (often called 'bottle cap'). obsolete and expensive.
TO-220 = three legged transistor with metal tab. still made and inexpensive.
An ST Microelectronics L7905CT is a TO-3, a National (Texas Instruments) LM7905CT is a TO-220.
You want something like this:
https://www.greatplainselectronics.com/proddetail.asp?prod=7905T
L7905CY - never heard of such a critter. Maybe typo since the "T" and "Y" buttons are right next to each other?
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