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  Rattlesnake Cable Company - High Quality Instrument Cables - Made in Montana
Forum :: Mods / Repairs

TB1000s Tone Control Problem


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Thrasher

Joined:
27 Feb 2008
Posts: 14
PostPosted: 04/19/2008 at 3:20 AM    Post subject: TB1000s Tone Control Problem link

I recently bought my TB1000s and when it arrived, the electronics were not in brilliant shape. There was a pronounced difference in level between the volume of the bridge and neck pickups when the controls were right up and the tone controls did nothing. Not a problem I thought, as I intend to use this guitar and it is not so much a collecters piece, I will replace the electronics and keep the old parts. So I bought nice new CTS 500k audio taper pots and sprague orange drop capacitors of .022 and .001 values. This did confuse me a bit as the schematic on this site suggested .01 caps , not .001, but seeing as the guitar contained a .001 (one had been removed) I went for the same value as was already present. I carefully rewired it as per the schematic, also consulting the Seymour Duncan and Gibson sites on wiring humbuckers (which said much the same as this site). My problem is that although the volume difference problem has cleared up, the tone controls still do nothing! Anyone got any ideas why this might be? I've probably made a dumb mistake somewhere.
Many thanks
Ian

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turn

Joined:
12 Jan 2006
Posts: 35
PostPosted: 04/21/2008 at 2:37 PM    Post subject: RE:TB1000s Tone Control Problem link

i'd say try the .01 as there's a big difference between that and a .001 value

this isn't a travis bean wiring schematic:
http://www.guitarnuts.com/wiring/stockgibson.php

but note 'capacitor tone values may vary from .02 to .05'

since your tone controls did nothing before, that cap value may have been the problem


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frankintank

Joined:
01 Jun 2001
Posts: 33
PostPosted: 05/24/2008 at 2:39 PM    Post subject: RE:TB1000s Tone Control Problem link

You bought the right caps. The schematic you showed was a little ambiguous. Your pickup lead should go to the center lug of the volume pot. Off of THAT SAME LUG, should be one end of the .02 cap. The other end of it should go to the center lug of the tone pot. Is one lug of the tone pot grounded? I've offered to troubleshoot over the phone in the past, but nobody ever takes me up on it.

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frankintank

Joined:
01 Jun 2001
Posts: 33
PostPosted: 05/24/2008 at 3:03 PM    Post subject: RE:TB1000s Tone Control Problem link

AND ... if the lug is grounded to the body of the pot - is the ground wire that connects everything to ground, also soldered to the back of the pot?

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Thrasher

Joined:
27 Feb 2008
Posts: 14
PostPosted: 05/25/2008 at 10:10 AM    Post subject: RE:TB1000s Tone Control Problem link

Thanks frankintank - I'll check this out over the next few days when i find time and post back here - your help is appreciated.

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Thrasher

Joined:
27 Feb 2008
Posts: 14
PostPosted: 05/26/2008 at 9:49 AM    Post subject: RE:TB1000s Tone Control Problem link

Hi frankintank - looks like all is as you describe - I have posted a photo of the currwent wiring here:
http://www.flickr.com/pho...../16269873@N08/2524014183/
- maybe that would help diagnose the problem.
I used the wiring diagram from this site to re-wire the guitar.
Thanks in anticipation for your help.
thrasher

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frankintank

Joined:
01 Jun 2001
Posts: 33
PostPosted: 05/26/2008 at 1:21 PM    Post subject: RE:TB1000s Tone Control Problem link

Correct me if I'm wrong, but it appears you used .001s all the way around. That would certainly explain your non-functioning tone circuit. I'm assuming that when you said it didn't work, you meant that it didn't attenuate the brightness. It behaved as if the tone knob was on 10 no matter what. The purpose of the .001s on the volume pots was to shunt some high end straight through so it wouldn't sound muddy when the volume was turned down a little. (a high pass filter). By using .001s in the tone attenuation circuit (where the .02s should be) you are not bleeding off any but the very highest frequencies when you roll the tone knob down.

1. DO leave the two .001s bridging the lugs on the volume pots.

2. REMOVE the two .001s from BETWEEN the volume & tone pots and REPLACE them with .02s or something close. (hint: .001 is not close)

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Thrasher

Joined:
27 Feb 2008
Posts: 14
PostPosted: 05/27/2008 at 12:43 AM    Post subject: RE:TB1000s Tone Control Problem link

I think you may be confused because they are all the same size - I thought that when they arrived - the order confirmation said they were the correct type:

Sprague 'Orange Drop' 0.001 Capacitor (.001CAP-OD) 2 0.68 1.36
Sprague 'Orange Drop' 0.022 Capacitor (.022CAP-OD) 2 0.68 1.36

and I checked what was written on them before soldering them in - I will check again after work this evening and post the markings here.

Thanks again - your help is really appreciated.

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frankintank

Joined:
01 Jun 2001
Posts: 33
PostPosted: 05/27/2008 at 3:33 PM    Post subject: RE:TB1000s Tone Control Problem link

Well ... I guess technology hasn't stood still for 30 years, but it sure seems odd to me that the .001s would have stayed the same size while the .02s would shrink by a factor of at least 3. I mean ultimately, doesn't a capacitor require "capacity?" - In this case, more film surface area to achieve the higher value? Gotta go old school on this. I'm guessin' that physically larger capacitors will figure into the solution somehow.


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Thrasher

Joined:
27 Feb 2008
Posts: 14
PostPosted: 06/14/2008 at 8:43 AM    Post subject: RE:TB1000s Tone Control Problem link

OK - sorry it's been a while since I posted here. We found the problem - not capacitors at all, but a duff tone pot. A replacement pot has cured the problem and both tone controls now work perfectly. Thanks again for your help - it may be of interest to you to see where I got the orange drops from - they are the same size! I think it's odd too. Once again thanks for taking the time to advise - much appreciated.

http://www.wdmusic.co.uk/.....rch/?manufacturer=Sprague

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frankintank

Joined:
01 Jun 2001
Posts: 33
PostPosted: 06/14/2008 at 1:47 PM    Post subject: RE:TB1000s Tone Control Problem link

Totally don't get the size thing. But I'm from the generation that used BIG V-8s to drive a car's REAR wheels. Different mindset I guess. Thanks for the update.

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