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FDP Forum / The 'Pup' Tent / Tele microphonic feedback question

Next 20 Messages  
m rock

Australia

Sep 4th, 2008 05:22 AM   Edit   Profile   Print Topic   Search Topic

Hi there I need an opinion please.
I have a couple of current Japanese 62 reissue teles(TL62B-TX) with Texas special pups.
Well at high volume the back pups they both squeal like pigs. Really high shrilling feedback.
I pulled the pup out of the cavity.
The height screws had some short rubber grommets but I stuck rubber bands around the remaining metal anyway.
The pups are waxed. I tightened every possible screw but it still feeds back.
Is this definitely a case of re waxing the pups to stop the feedback?
If it is, why do they still feedback despite them being waxed?
Thanks.


BuckeyeBlues
Contributing Member
*

Columbus, Ohio

Season to taste.
Sep 4th, 2008 06:40 AM   Edit   Profile   Print Topic   Search Topic

I had a bridge pickup in my MIJ Vintage 50's Tele that had the same problem. I replaced it with a Nocaster bridge and am very impressed with the results.

MudSkipper

usa

Sep 4th, 2008 03:08 PM   Edit   Profile   Print Topic   Search Topic

Check the backplate on your bridge pickup (if there is a space in between the pickup and the plate, it would squeal). Also press down on the front end of your bridge against the body while the pickup is squealing (if the front end of the bridge is afloat, the whole thing will squeal).

m rock

Australia

Sep 4th, 2008 05:05 PM   Edit   Profile   Print Topic   Search Topic

Thanks guys.
The front end of the bridge isn't afloat and pressing down isn't stoping the feed back.
I measured a space with a feeler gauge in between the pickup and the plate at the back and front around 035.
The side curves of the pup also have a gap where you can actually see the body paint.
What can I do here?
Perhaps some tape on the sides?
Thanks.

Space Station Philippe
Contributing Member

Columbia, SC

Formerly TI-99/4a
Sep 5th, 2008 05:16 PM   Edit   Profile   Print Topic   Search Topic

I'm thinking it's gotta be something with the guitars. I can't imagine both Texas Specials being poorly potted. Some people also put a little bit of regular candle wax in between the bridge and the body and reseat the bridge. Crazy, but I've done it and it works pretty well.

If that doesn't do it, I'd see if someone can re-pot the pickups.



m rock

Australia

Sep 5th, 2008 05:40 PM   Edit   Profile   Print Topic   Search Topic

"people also put a little bit of regular candle wax in between the bridge and the body and reseat the bridge"

Do you mean between the bridge plate and the body?


Space Station Philippe
Contributing Member

Columbia, SC

Formerly TI-99/4a
Sep 5th, 2008 07:25 PM   Edit   Profile   Print Topic   Search Topic

Yes. That tends to curb some of the extra vibe that can get to the bridge pup. Try it on one of your teles to see if it cuts the feedback without hurting the tone too much. I've never noticed a problem.

mrfix

canada

Sep 5th, 2008 08:26 PM   Edit   Profile   Print Topic   Search Topic

I suspect it is the bridge. Get it to lightly squeel so not to damage a speaker, then touch each string to determine which string is the problem. In most cases it will be the A or D string. The heavier bridge plate and saddles on the Gotoh bridge are very effective in eliminating this(see link). You probably don't want to change styling so the only other option is replace the bridge pickup with a not so overwound pickup. The Fralin Blues Special would be an ideal replacement. The Fralin is RWRP to Texas Specials so neck bridge combos will be noiseless. Sometimes hot waxing the bridge into place may also help, but I personally would look at other pickups.

link

mrfix

canada

Sep 5th, 2008 08:38 PM   Edit   Profile   Print Topic   Search Topic

I see you are in Australia. You should check out one of your local pickup manufacturers. Kinman Noiseless Pickups.

Kinman Link

m rock

Australia

Sep 6th, 2008 02:11 AM   Edit   Profile   Print Topic   Search Topic

Ok problem solved!
Space Station didn't feel comfortable with the wax job.
mrfix tried the string thing but didn't work.

I actually removed the pickups coper back plate.
Made a narrow T plate from some hard plastic for the height screws to work
The sound is a tad darker but still plenty of twang.I guess these guitars were just not designed for high blistering volumes.

The only small problem I am having is the ground buzz.
I soldered an extension wire from the pickup to the back of the tone pot but it's not doing a very good job.

Any ideas on this front?

spud1950

Land Of 1000 Dances

Do you know how to Pony?
Sep 6th, 2008 07:52 AM   Edit   Profile   Print Topic   Search Topic

The buzzing is most likely being caused because removing the base plate removed the ground to the bridge.The bridge must be grounded.The plate was connected to ground and the ground was conveyed to the bridge from the plate by the contact with the height adjustment screws.You need to run that extension wire from back of the pot to bridge,not the pickup.You strip some insulation off the end of wire and sandwich the bare end between the bridge and the body.That will ground the bridge and strings and the buzzing should stop.

Edit - This is a bit late,but if the original squealing stopped by removing the base plate,the problem was caused by the base plate not being firmly affixed to the bottom of the pickup.This causes it to vibrate and you get the microphonic squeal.This is not uncommon.The fix is to remove the plate,add some extra wax,put the plate on the pickup and carefully heat it with a soldering iron just enough to re flow the wax.The extra added wax makes a more solid bond and the problem should be fixed.

(This message was last edited by spud1950 at 08:11 AM, Sep 6th, 2008)

m rock

Australia

Sep 6th, 2008 11:36 AM   Edit   Profile   Print Topic   Search Topic

Oh ok, I see.Noting that originally the pickup had a ground wire going to the coper base plate, I thought I needed to keep that wire on the pickup to a ground.
I'll swap it and see how it goes.

Regarding the base plate,yes the plate was only held on by the magnetic force of the pup. I'll give that a shot on the other tele.
Not sure whether Space Station was saying the same thing and I misunderstood.
Great! Will let you know how it goes.

Really appreciate the help from everyone.
These days I seem to get more useful honest help on a forum than from a 'tech' in a store.


Achase4u
Contributing Member
*

U.S. - Virginia

Sep 6th, 2008 01:55 PM   Edit   Profile   Print Topic   Search Topic

Yes you should put some wax in there between the baseplate and pickup. I was pot my pickups with the plate on - I can put my DRRI on 10 in a 10'x12' room and no squeal on either pickup. The cover on the neck pickup can create noise too...

spud1950

Land Of 1000 Dances

Do you know how to Pony?
Sep 6th, 2008 05:46 PM   Edit   Profile   Print Topic   Search Topic


"Noting that originally the pickup had a ground wire going to the coper base plate, I thought I needed to keep that wire on the pickup to a ground."

The base plate is actually copper plated steel,the plating being put on as a rust barrier.When you put a steel plate on and connect it to ground,it alters the magnetic field and gives the pickup a more concentrated,punchy tone.That's why by removing it,you've noticed a change in the sound of the pickup.It is traditional for the Tele bridge pup to have a base plate,as it was originally designed,but there are now those that come without it.

m rock

Australia

Sep 6th, 2008 10:41 PM   Edit   Profile   Print Topic   Search Topic

Ok now the can of worms have really been opened...
I've accidentally broken the 'live' pickup winding about 1/2cm from where it connect to the pickup.
Have located the two strands and there is about 2mm between them.
Am I screwed?Is there a way to link them without pulverizing them??


spud1950

Land Of 1000 Dances

Do you know how to Pony?
Sep 6th, 2008 11:26 PM   Edit   Profile   Print Topic   Search Topic

Which end of the wire did you break,the end that's buried under all the coil windings or the end that's on top of the windings?

Achase4u
Contributing Member
*

U.S. - Virginia

Sep 6th, 2008 11:27 PM   Edit   Profile   Print Topic   Search Topic

did you break the ground side that connects to the black wire or the white one?

m rock

Australia

Sep 7th, 2008 12:57 AM   Edit   Profile   Print Topic   Search Topic

Hi, I broke the end that's on top of the winding that connects to the yellow ('hot')wire.
So I've broken the winding in half approximately 1cm from where the yellow wire starts.

I've managed to gently straighten both ends of the winding and it doesn't look as bad as I thought because they practically meet.
trouble is how do you fuse them together?
A line of solder?
Thanks.

m rock

Australia

Sep 7th, 2008 02:09 AM   Edit   Profile   Print Topic   Search Topic

Here is a photo:
http://s145.photobucket.com/albums/r223/MROCKER_01/?action=view¤t=pup.jpg


Achase4u
Contributing Member
*

U.S. - Virginia

Sep 7th, 2008 10:26 AM   Edit   Profile   Print Topic   Search Topic

If its the hot wire where the coil *ends* then what you can do is this -

Carefully desolder the yellow hot wire from the eyelet - you must clear the solder so you have an open eyelet -

Gently unwind one turn of the pickup coil wire from the end. Thats your new last turn

To ensure continuity - you have to gently sand off the insulation of the wire. Some wire insulations will not melt when soldered.

So take a bit of 220 or 320 grit sand paper. Fold a tiny peice over - then gently slide it down the wire - the trick is not to break it but get the insulation off. If it breaks, just unwind another turn and try again.

Also - you dont want any of the sanded part to be *before* the eyelet - so what I do is hold the wire with one finger at the eyelet, and sand the wire beyond that.

Put it through the eyelet 3-4 times nice and snug. Then put your yellow wire back in, and solder it back up.

Test for ohms - it should be back together...

BTW I couldnt view the picture for some reason...

(This message was last edited by Achase4u at 10:31 AM, Sep 7th, 2008)

Next 20 Messages  

FDP Forum / The 'Pup' Tent / Tele microphonic feedback question




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