[Collins] 75S-1 Problem (update)

[GBabin73 at aol.com]

Thanks Pete,
The crackle only shows up when the calibration oscillator is running. I  
checked the terminal strip ground lugs. I'll check the socket ground. Sometimes  
it's the littlest thing.
 
73! DE N5MCJ, Jerry
  
In a message dated 2/18/2005 7:27:59 A.M. Pacific Standard Time,  
pwokoun at hotmail.com writes:

Another  source of audio crackle I've found in some of these older pieces is 
the  ground connection on terminal strips starting to go bad.  Corrosion or  
what-not starts affecting the terminal strip to chassis junction.   Loosening 
the screws and re-tightening usually fixes it for awhile.   If you do it 
while the radio is powered up you'll immediately know when  you 'find it'.  
Then, clean it up, not just retighten the  screw.  Also, tube sockets that 
have ground lugs built into their  mounting straps fall into the same 
category (on 51S1s, I think).   Naturally, take precautions when the things 
are powered up!

pete  KH6GRT