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Cleaning up my new (to me) Mac 1900 receiver

M

MikeO

Active Member
I just purchased a Mac 1900 receiver off craigslist and am really enjoying it. It is in excellent cosmetic condition and plays very well with the exception of some issues with the volume control, and having a fair bit of dust inside.

The middle cage was easily removed with a few screws and I cleaned this section out with compressed air. It does not seem nearly as simple to remove the rear cage and front panel from the top of the unit. There is a lot of dust visible under the rear cage and there is also some dust visible behind the glass. If possible I would like to get rid of this.

Other than this, the only issue so far is a loud crackling noise if I turn off the receiver using the on/off/volume control. There is no noticeable static when adjusting the volume, just when turning it off. Also, if I turn it off using a power bar, there is no problem. So for now I just use the power bar.

Would something like fader lube help with this issue or is it just the standard volume control issue that many seem to experience with this amp. I guess access to the volume control would have to be done from the bottom of the amp? Also, is there some trick for getting the back cage and front cover off this amp?

I guess one last question would be what would be recommended for cleaning the chassis of the receiver?


Thanks in advance.

Mike O
 
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MikeO said:
Other than this, the only issue so far is a loud crackling noise if I turn off the receiver using the on/off/volume control. There is no noticeable static when adjusting the volume, just when turning it off. Also, if I turn it off using a power bar, there is no problem. So for now I just use the power bar.
Click to expand...

I'm not at all familiar with Mac construction, but other gear I've had has a cap across the power switch to reduce any chance of arcing (which quickly destroys the switch) when turning the power on and off. If that cap is bad, you could get lots of noise and crackling.

The other person's suggestion of trying DeOxit is a good one, but definitely take it in and have it serviced if that doesn't fix it.

I suppose you could just keep on using the power bar, but that doesn't really fix the problem... :)
 
I agree and Faderlube feels so much better as you turn the pot. Obviously Faderlube is the best for slide pots also.

Thanks,
Ron-C
 
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