Sorry for bumping this old post. But do you remember how is the N connector on the HP 436A front panel connected to the circuit board? I just got this meter in working conditions, but the N connector for the reference oscillator from the 1970s has worn off at this point. It succeeds or fails to make a connection depending on the initial angle when the connector is screwed in.
![Banging Head |O](https://www.eevblog.com/forum/Smileys/default/bangheadonwall.gif)
I inspected it as carefully as I could and didn't notice any mechanical damage, so I assume it's just wear and tear.
I'd like to get the connector replaced but I still need to do some measurements right now so I don't want to risk disabling the meter. (Yes, I do realize a precision connector costs more than the meter itself! And I do realize a potentially costly recalibration is probably required... But that's life... And the worst thing is wearing the power sensor off as well!)
Thanks in advance.