[time-nuts] HP 5370A to B conversion

Mark Sims holrum at hotmail.com
Fri Dec 19 02:15:49 EST 2014

It's not practical to convert an "A" to a true "B" model.  They use a different input front end circuit.  But,  the rest of the machine is compatible.  The "B" firmware runs on a "A".  John's CPU board works on either version. 		 	   		  

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