[R-390] Another newbie question...

[John Saxon]

Good evening:

I am working on a R-390 (non-A), audio chassis.  I suspected a problem with C-603, coupling cap to the local audio  6AK6.

It is mounted on a terminal board and appears to have been MFP treated.  I was going to lift one end to test the cap when I discovered I could simply "unwind" the lead from the terminal stud, without having to unsolder anything.  I tried another cap and found the same thing.

These things were soldered, weren't they?  Could the connection have deteriorated in some way? 

I thought I would ask the experts.

Thanks,
John
K5ENQ