Sheilding in head cab?

BustedWah
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« on: August 14, 2009, 04:58:40 AM »

Hey everyone,

I'm about to build a head cab for my OTS and I was wondering if the inside of the top should have some shielding to shield the electronics. If it does, what material?
Anything else of the sort that I should know for head cab building?

Thanks,

Alex


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Pickmaster
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Re: Sheilding in head cab?

« Reply #1 on: August 14, 2009, 03:08:35 PM »

Usually it’s a copper foil. Aluminium would do as well.
But in my case it introduced a hum, so I removed it.
Works perfectly without any shielding.


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archelo
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Re: Sheilding in head cab?

« Reply #2 on: August 15, 2009, 10:16:48 PM »

This is interesting...I left out the shielding in a 1987 head and it caused screeching sounds when i cranked the amp. I couldn't get the amp into OD without getting awful noises out of the amp. I originally thought it was bad preamp tubes but Nik suggested the shielding and completely fixed the problem. i guess every amp is different.


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Franc
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Re: Sheilding in head cab?

« Reply #3 on: August 18, 2009, 09:21:58 AM »

If it makes good contact, you close the cage and it should always be an improvement.

If it causes hum that means something is wrong


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bluesfendermanblues
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Re: Sheilding in head cab?

« Reply #4 on: August 18, 2009, 07:43:37 PM »

Quote from: BustedWah on August 14, 2009, 04:58:40 AM

Shielding the cabinet is not nessasary. If you paly a singlecoil guitar, its probably better to use the schielding there instead


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JD0x0
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Re: Sheilding in head cab?

« Reply #5 on: August 19, 2009, 02:17:44 AM »

Quote from: Franc on August 18, 2009, 09:21:58 AM

If it makes good contact, you close the cage and it should always be an improvement.

If it causes hum that means something is wrong

+1 i cant see how it would cause a problem. the entire chassis is aluminum and is grounded to sheild the "guts" of the amp. Adding the small peice on the cab is just like putting a lid on it to keep more unwanted noise out.

The only way it could cause a problem is if one of your components was touching the sheilding and sending a signal to ground that shouldnt go there.

If that happens just cover the sheilding with electrical tape except for the aluminum that makes contact with the chassis. I do this on my guitars that i sheild


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BustedWah
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Re: Sheilding in head cab?

« Reply #6 on: August 19, 2009, 07:37:55 AM »

Thanks for the input. I actually asked because Nik suggested it a while back.


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