[Amps] Alpha 77 start up

[Jan Ditzian]

I tried to operate the relay from a 24 VDC supply, but all I ever got 
was a spark.  No relay sound or indication that the relay had operated.  
I ordered a replacement HC-1 24 volt relay from Max Gain systems.

It looks like this going to be a project to remove and replace.  Has 
anyone done this?  I would like to know if the relay must be unscrewed 
and removed from the top.  If so, then I must unsolder the bottom 
connections, the operating poles, from the bottom through the hole in 
the circuit board that is over the relay when viewed from the bottom.  
Is the panel tapped, or is there an anchored nut, or is the nut free, so 
that I have to hold it with something on the bottom when unscrewing it 
from the top?

Any other suggestions about this replacement are welcome.

Jan, KX2A