2. amps-preamps
  3. 165850-46419

Conrad-Johnson Discolored (rusty?) Allen screws on side of MF-2550.

I just bought a used CJ MF-2550 a short time ago and it's been working perfectly. Today I was just checking the routing of my cables with a flashlight and I accidentally noticed that there are Allen (hex) screws on either side of the amp, between the cooling fins. There are also regular Philips screws. The question is that the Philips screws all look completely normal, but some of the Allen screws are discolored and may be rusty.

Would you think I should just leave well enough alone since the amp is working OK or should the discolored Allen screws be replaced? I'd be hesitant to do the replacement myself, in case any of them broke off and left inner components unsupported. Any advice would be appreciated. A link to a photo I just took follows.

https://i.imgur.com/rJnfyZs.jpg
rff000
russ69's avatar
russ69
3,506 posts
 
They are just oxide finished hex cap screws, they tend to rust. You can unscrew them and use WD40 and a toothbrush to remove surface rust. 
rff000 OP
23 posts
 
Thanks for your help.
arcticdeth's avatar
arcticdeth
1,572 posts
 
my first step is to have the factory do a serious inspection and replacement of any part(s) which is needed.  

    Congrats on the new CJ power amp, they are a great company. Enjoy.

 What speakers and other components are you using..



   
rff000 OP
23 posts
 
Speakers are NHT 2.5
Preamp is McCormack Micro Line Drive
DAC is Jolida FX Glass DAC III
CD Player is Rega Planet
Turntable is Thorens TD-203
Phono Stage is Rotel RQ-970BX
DVD and Hi-Res: Sony UBP-X700

Not real high end, but I used the system for many years with a smaller amp than I just got. I’m a little reluctant to spend a lot for a factory check when everything is working well but I may ask them how to handle the rusty screws.
More to discover