{Collins} 75A-4 Hum


I own 2, 75A-4 receivers. Both have recently been upgraded. Black beauties 
replaced, filter and meter protection, all of the Collins recommended 
modifications. The ganged power supply caps have been replaced with new 
reproductions. As I recall a mod to reduce hum was performed as well.

I have the same amount of hum in each receiver making headphone use 
imposable. The hum is barely audible through the 270G-1's but it's present 
none the less.

Is this something I just have to live with? I really hate the prospect of 
scabbing on another cap. What are your experiences with 60Hz hum on your 
75A-4's. Thanks in advance.

Mike Monnier

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