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edwin
Senior Member
Username: edwin

Post Number: 2193
Registered: 5-2002
Posted on Thursday, February 11, 2016 - 12:12 am:   Edit Post

So, I've been working on the fact that my Starfire is a bit noisy. It's been a problem with directional noise. In the last 4 hours I have discovered something.

Carbon shielding paint isn't worth squat.

I had assumed (yeah, we know how that goes) that applying as much of this stuff as I could in the cavity would give me at least a bit of protection. But, I finally decided to see what would happen if I created a little box out of some sheet copper I have lying around and close off some of the areas where I couldn't reach with the paint. I did that. A bit of a change. Then, I decided to check continuity throughout the cavity. Nada. The paint was not conducting anything. So, I cut up some more pieces of copper and added them to the other areas which had previously been only covered by paint. I'm starting to hear a real difference. There's still some noise, but it's cut by at least 15-20db. I still have some areas to cover and I'm going to have to come up with a good strategy as to how to reach them (the door in the back is frankly too small. I should have been far more adamant in designating the size cutout I wanted back when I had it done in 1996. Thing is, the guy did a lovely job. Just too small.). I've spent the last 18 years thinking I had at least a minimal amount of shielding in there when I in fact had none.

I had to remove the pickup selector switch, since it's so far toward the horn and it's just hard to get things arranged in that part of the cavity, but I think if I spend some more time on it, I should be able to get it together. Maybe I can even go back to the old pickups!

I really get why Alembic uses the silver stuff. It works.

Live and learn.
jacko
Senior Member
Username: jacko

Post Number: 3730
Registered: 10-2002
Posted on Thursday, February 11, 2016 - 7:19 am:   Edit Post

Could you not fill the instrument with the silver shielding paint then slosh it around a bit to get full coverage?

Graeme
lbpesq
Senior Member
Username: lbpesq

Post Number: 6344
Registered: 7-2004
Posted on Thursday, February 11, 2016 - 8:44 am:   Edit Post

Edwin:

You might want to try some shielding tape. I've used it often with excellent results.

http://www.stewmac.com/Pickups_and_Electronics/Shielding/Conductive_Copper_Tape.html

Bill, tgo

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