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Station X · 9th Jul 2019, 12:08 pm

Presumably the clock would run without the correct pulse?

The OP will have problems if it's 115VAC 60Hz though. A functional test to see if the clock runs slowly on 50Hz is the next step.

9th Jul 2019, 12:08 pm	#13
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,289	Re: Vintage IBM school clock. Presumably the clock would run without the correct pulse? The OP will have problems if it's 115VAC 60Hz though. A functional test to see if the clock runs slowly on 50Hz is the next step. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.