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Post subject: Shielding questions Strat deluxe plus (personality card)
Posted: Wed Jan 27, 2016 3:04 pm
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Hey Everyone,

I have this really annoying noise that I think is RFI/EMI and am trying to shield my guitar effectively.

This guitar doesn't have its ground wire soldered to a pot like a lot of guides explain. So my first question is how would I ground the shielding if the ground wire appears to be hardwired to the circuit? The green wire that I am pointing to at the bottom of the picture below is hooked to the ground in the claw on the back of the guitar.

Image

Second question. This guitar has the personality cards. Do I need to figure out a way to copper foil the inside of the cavity in the image shown below?

Image


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Post subject: Re: Shielding questions Strat deluxe plus (personality card)
Posted: Wed Jan 27, 2016 4:24 pm
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Do you know where RFI from first ?

Some RFI go through your amp by wall AC wiring ,other by the pickups top where is not shielded.


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Post subject: Re: Shielding questions Strat deluxe plus (personality card)
Posted: Wed Jan 27, 2016 5:08 pm
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I believe the guitar is picking it up because when I unplug the guitar from the amp, the noise gets ALOT quieter.


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Post subject: Re: Shielding questions Strat deluxe plus (personality card)
Posted: Wed Jan 27, 2016 6:36 pm
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Hi there thanks for the photos first time I have seen inside this type.
Yep you should be able attach your ground with some solder to the green wire that goes to the trem claw.. maybe just add it to the lug.
If you follow it, it should connect via the circuit to the pickup green pickup wires as well and if you note those metal rings on the circuit board I suspect this is how the pots are grounded.
Link to diagram kindly provided earlier by John C http://www.fmicassets.com/Damroot/Origi ... A_SISD.pdf
Those N3s should be reasonably quiet... :D


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Post subject: Re: Shielding questions Strat deluxe plus (personality card)
Posted: Wed Jan 27, 2016 7:30 pm
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The N3's are really quiet for hum... I have this really weird noise viewtopic.php?f=13&t=100347 ... here is the link to my other post when I thought it was the amp.

The noise a high pitched squeal. If you are older (40's 50's) you might not be able to hear that frequency.

I soldered a wire from the shielding to the trem claw, not exactly to the lug that is hooked onto the trem claw and it didn't make the noise go away. I am guessing that the shielding isn't grounded. Should I hook the ground wire to the lug where the guitar is grounded?

The red wire is what I soldered on to be my ground for the shielding. Does that look like it should work?

Image


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Post subject: Re: Shielding questions Strat deluxe plus (personality card)
Posted: Wed Jan 27, 2016 8:15 pm
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Well the best way to check would be with an ohm meter but assuming you have a good solder joint yes.
Maybe reseat the plugs as well.
I have yet to listen to the audio track.
Does the issue occur elsewhere?
Did you try another lead?
Does the issue occur with another strat?
Does the problem get worse or change as you reorientate yourself in the room?
Is it there some times of the day and not others?
This issue will initially be a process of elimination i.e. not the amp...then try another guitar if you can etc. :D


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Post subject: Re: Shielding questions Strat deluxe plus (personality card)
Posted: Wed Jan 27, 2016 8:25 pm
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I did test the connection with an ohm meter and there was no resistance.

What do you mean reseat the plugs?

The issue does not occur at my moms house a few miles away.
What do you mean another lead?
The issue does occur when I plug in my electric mandolin.
I will try and move the amp around some more to see if I can get a change in the noise.
The noise does seem to be sporadic and is not predictable. It seems to happen a couple of times or get going and not stop.


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Post subject: Re: Shielding questions Strat deluxe plus (personality card)
Posted: Wed Jan 27, 2016 9:01 pm
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Hi there I just meant the plugs on the board but it you are getting it on other gear it will be difficult to eliminate.
By lead I meant another guitar lead.
Yeah by moving the amp/strat around when it occurs you may be able to determine if it is via the air .. it will probably change in level or via the mains ... in which case it may not.
There could be spurious noise generated on your mains could be anything rogue connected to it including switch mode supplies. I have even come across a shaver socket that has caused issues.
So next step is it via the wall socket or the air.. :D


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Post subject: Re: Shielding questions Strat deluxe plus (personality card)
Posted: Wed Jan 27, 2016 10:55 pm
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Sorry to hear your still having issues w/ your gear.

Have you tried different outlets w/ in your house and is the noise the same or worse at each outlet?

I did some searches after that last post of yours, some rfi/emi fixes that were brought up were:
lowering the gain stage of the amp instead of the ecc83/12ax7 using 5751's in V1 & V2 and using a 12at7 for the reverb recovery
isolating the 1st stage tubes by either removing V1 and leaving it out while playing the tremolo side of the amp
isolating the 1st gain tube w/ a tube cage(couldn't find this item for sale anywhere) but pictures are available
Image
using shorter better shielded guitar cables(I use Mogami silver series gold tip low noise 12' part #2319)
http://www.mogamicable.com/category/bulk/guitar/
using a power conditioner

Maybe someone else can point to something else, good luck


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Post subject: Re: Shielding questions Strat deluxe plus (personality card)
Posted: Wed Jan 27, 2016 11:33 pm
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My humble advice and taking nothing away from the good suggestions in the last post is find the source of the issue then look for solutions......
I have listened to the clip its a pretty high frequency and at a guess above 12khz ....failing that you might have to go back and live with your mother :D


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Post subject: Re: Shielding questions Strat deluxe plus (personality card)
Posted: Thu Jan 28, 2016 1:26 am
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Since you kinda bailed on the other thread...

There is nothing wrong w/ the guitar, cable or the amp....you've already proven this by the following:
1. You tried 3 amps(at your house) and they all exhibited the same issue
2. You proved it isn't the guitar when you tried your mandolin and it still produces the intermittent squeal
3. You proved it isn't the guitar, cable or amp when it worked fine at your mom's/friend's

So now your just trying to get the best you can get from your house, given its location to power/tower and perhaps poor grounding or long/crowded circuits.

I would follow this order to get the best out of your location. Also it is probably the most cost effective.
By checking other outlets w/in your house you may find a better shielded/grounded outlet/circuit leg.
By shielding your guitar, it may eliminate minor interference between its circuits and airborne interference.(Your solder job doesn't look great but a connection is all that's required)
By using a shorter/better shielded guitar cable minor improvements may be made, the one I recommended has very good "specs" for your issues and costs under$20.(I'm assuming your second cable is the same brand/type as the first)
Trying the replacement tube options in such a way to reduce the amps overall gain may provide both tonal and interference improvements. Cost will very but I would start with removing V1 and seeing if it improves the problem, if not I would order two 5751's(less than $40 for two) and replace both V1 and V2. That should lower the gain somewhat and provide a better tone as well(at least imo). If the problem still persists lower the gain again in the reverb section V3/V4(both for less than $40). If the tube swapping doesn't work, Id be surprised.
The last thing I would try would be a power conditioner, which may provide some additional improvement and if that doesn't work......well like I said try the aluminum foil or move as Arjay suggested or Jimmyjames suggestion lastly, definitely don't move in with your mother...


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Post subject: Re: Shielding questions Strat deluxe plus (personality card)
Posted: Thu Jan 28, 2016 2:06 am
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Cell phone , PC , halogen and neon lamps. electrical motor make noise.

Your mother may not have those gadget in their house or they are at OFF.

Your shielding may help or not. :(

For better and long last shielding, you must put (a drop of ) solder at each piece of copper foil. Glue may not be good for a zero ohms contact with years.


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Post subject: Re: Shielding questions Strat deluxe plus (personality card)
Posted: Thu Jan 28, 2016 5:30 am
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Have you considered shielding the pickguard, wrapping a small bit of the foil in the wholes of the tone and volume knobs, and allowing the contact between the pots and the pickguard foil make contact. You will also need to make sure that the pickguard foil and body cavity foil make contact. This should ground all your shielding and help create your Faraday cage. I did this with my '76 Strat and it worked.


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Post subject: Re: Shielding questions Strat deluxe plus (personality card)
Posted: Thu Jan 28, 2016 5:45 am
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I really love my blue SSS Deluxe Strat Plus.

By the way, Fender just released more personality cards. I purchased a Phaser and Super Stacker Cards direct from Fender.

1.The Phaser Card - Positions 2 & 4 become out of phase and you get kind of Brian May out of phase tones. It might do more, but I haven't had much time to check it out.

2. The Super Stacker - This hot-rods positions 2 & 4 to be like humbuckers. It's pretty thick sounding and great for over driven sounds.


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Post subject: Re: Shielding questions Strat deluxe plus (personality card)
Posted: Thu Jan 28, 2016 12:16 pm
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stratele52 wrote:
Cell phone , PC , halogen and neon lamps. electrical motor make noise.


In my experience, most noise are due to either of:
- Ground loops
- Light dimmers. This is by far the most common reason I have seen.
- Aquarium / pet water fountain / automated plant watering pumps

stratele52 wrote:
Your shielding may help or not. :(

More likely not.
N3s are humbuckers, and ground shielding around them doesn't do much more than the pickup itself does already. EM noise coming through the air is going to be cancelled out anyhow, so noise will likely be RF signals transmitted through the guitar cable. Shielding doesn't stop that.

A ferrite core or balun plug (which has the secondary effect of working like a ferrite core) on the guitar cable might help more.


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