Re: Looking for data on 9-pin Vacuum time delay relays used in old Tek-scopes


 

Ulf,

I designed these into things about fifty years ago. The Amprite type numbers generally provided the data. For example a 117NO60 would indicate a 117-volt unit with normally-open contacts that would close 60-seconds after power was applied. These thermal delay relays were often used to delay the application of plate voltage until cathodes warmed up.

Bruce, KG6OJI

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