http://pocosales.com/
If you need a circuit breaker for your Ten Tec radio that requires a super fast magnetic breaker, Poco Sales in Chatsworth California is the place to order. Use the search wizard and be sure to indicate that it is for Ten Tec gear. Greg Porter will point you in the right direction.
I placed my order last Friday morning and the breakers arrived today, this AM. Fine business! I will order from them again if the need arises.