Volume Pots For My 1981 LS100S Love Rock

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mdvineng
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Re: Volume Pots For My 1981 LS100S Love Rock

Post by mdvineng » Fri Mar 26, 2021 4:12 am

just to throw a spanner in the works. Tokai diagrams for LS and LC with and without pcb's have A for Tone and B for Volume. Follow what you have in yours.
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Sigmania
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Re: Volume Pots For My 1981 LS100S Love Rock

Post by Sigmania » Fri Mar 26, 2021 7:59 am

Thanks to both of you guys. I obviously stumbled into an interesting topic.

guitar hiro, I saw the A but assumed it was for amps or something. Did not realize it meant audio taper. I appreciate you clarifying and the link to your earlier thread.

mdvineng, I appreciate your help as well. What do those letters mean or represent? A=audio taper? B= linear taper?

Again, I appreciate both of your expertise and knowledge re circuitry.
'79 LS80 GT Reborn, '79 ST100 Springy, '81 LS100S Hog, '81 ST80 Springy, '81 TE120 Breezy, '82 LS120 Love Rock (solid flame maple top), '82 JB50 Jazz Sounds

mdvineng
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Re: Volume Pots For My 1981 LS100S Love Rock

Post by mdvineng » Fri Mar 26, 2021 10:31 am

A is audio taper B is linear
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guitar hiro
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Re: Volume Pots For My 1981 LS100S Love Rock

Post by guitar hiro » Sun Mar 28, 2021 9:55 am

mdvineng wrote:
Fri Mar 26, 2021 4:12 am
just to throw a spanner in the works. Tokai diagrams for LS and LC with and without pcb's have A for Tone and B for Volume. Follow what you have in yours.

I just checked my 1980 LS-50 inkie & it is as you state from the catalog; A = tone & B = volume. :)

I stand corrected & thanks for that. :wink:
'holier than thou cuntiness' was originally exported to the entire planet from the land of rocks and trees aka Cadada, and now the entire solar system is infected :lol:

Sigmania
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Re: Volume Pots For My 1981 LS100S Love Rock

Post by Sigmania » Sun Mar 28, 2021 10:43 am

So

tone pot: audio taper, A

volume pot: linear, B

Thanks guys.
'79 LS80 GT Reborn, '79 ST100 Springy, '81 LS100S Hog, '81 ST80 Springy, '81 TE120 Breezy, '82 LS120 Love Rock (solid flame maple top), '82 JB50 Jazz Sounds

guitar hiro
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Re: Volume Pots For My 1981 LS100S Love Rock

Post by guitar hiro » Sun Mar 28, 2021 5:41 pm

Sigmania wrote:
Sun Mar 28, 2021 10:43 am
So

tone pot: audio taper, A

volume pot: linear, B

Thanks guys.
That's correct.
I also checked yet another one of my early '80s Tokais; this one a LC. It also has the B volume pots & the A tone pots.
Looks like the Tokai diagrams info mentioned by member mdvineng matches up.
I'm glad he posted that info; if he had not I would have never checked the pots in those two examples.



On a side note: I have a completely original Bacchus BLS with a serial number range 101***.
I knew it had NOBLE pots so, I checked it very closely today.
It has 15A500K pots for both volume & for tone. :lol:
These MIJs are some funny birds some times.
'holier than thou cuntiness' was originally exported to the entire planet from the land of rocks and trees aka Cadada, and now the entire solar system is infected :lol:

Sigmania
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Re: Volume Pots For My 1981 LS100S Love Rock

Post by Sigmania » Tue Mar 30, 2021 7:30 pm

So I finally opened it up and pulled the PCB to see what the pots had written on them.

The volume pots say NOBLE B 500k Ohm.

Image

The audio pots say NOBLE 15A 500k Ohm.

Image

And the PCB board just because guitars are cool. :D

There is a clear thin plastic shield under the board with stand off metal washers. Not sure if that is factory correct? And cavity is painted with black shielding paint.

Image
'79 LS80 GT Reborn, '79 ST100 Springy, '81 LS100S Hog, '81 ST80 Springy, '81 TE120 Breezy, '82 LS120 Love Rock (solid flame maple top), '82 JB50 Jazz Sounds

mdvineng
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Re: Volume Pots For My 1981 LS100S Love Rock

Post by mdvineng » Tue Mar 30, 2021 11:52 pm

The thin plastic shield is to insulate the board from the black conductive paint.
Tokai VSB80 OF, Michael Kelly Patriot custom, Epiphone Elite SG & EB3. 8)

Sigmania
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Re: Volume Pots For My 1981 LS100S Love Rock

Post by Sigmania » Wed Mar 31, 2021 9:28 am

Interesting. I did not realize the paint was conductive. What is the purpose of it?
'79 LS80 GT Reborn, '79 ST100 Springy, '81 LS100S Hog, '81 ST80 Springy, '81 TE120 Breezy, '82 LS120 Love Rock (solid flame maple top), '82 JB50 Jazz Sounds

guitar hiro
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Re: Volume Pots For My 1981 LS100S Love Rock

Post by guitar hiro » Wed Mar 31, 2021 9:43 am

Hey Geoff, looks like you are making some progress there. :D
You could just replace the bad pot & keep the circuit board; that is certainly a viable option. :wink:
'holier than thou cuntiness' was originally exported to the entire planet from the land of rocks and trees aka Cadada, and now the entire solar system is infected :lol:

mdvineng
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Re: Volume Pots For My 1981 LS100S Love Rock

Post by mdvineng » Wed Mar 31, 2021 10:03 am

Sigmania wrote:
Wed Mar 31, 2021 9:28 am
Interesting. I did not realize the paint was conductive. What is the purpose of it?
Shielding, just like copper foil but way easier to apply. Keeps interference down from outside sources of EMF.
Tokai VSB80 OF, Michael Kelly Patriot custom, Epiphone Elite SG & EB3. 8)

Sigmania
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Re: Volume Pots For My 1981 LS100S Love Rock

Post by Sigmania » Wed Mar 31, 2021 10:58 am

Thanks for that info!

Still striking out on the NOBLE pots.

mdvineng, I did try the NOBLE link you shared, but couldn't find a similar pot. Maybe I missed something?

I also looked for ALPS, and no luck.

Can you guys send me a link for appropriate pots that would work? I am basically just finding generic pots shipped from China that seem to match.

Also, some have a small loop at the end of the bent leads and some have a point. Not sure what the originals have since they are soldered, but guessing the small loops?

Thanks!
'79 LS80 GT Reborn, '79 ST100 Springy, '81 LS100S Hog, '81 ST80 Springy, '81 TE120 Breezy, '82 LS120 Love Rock (solid flame maple top), '82 JB50 Jazz Sounds

mdvineng
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Re: Volume Pots For My 1981 LS100S Love Rock

Post by mdvineng » Wed Mar 31, 2021 11:23 am

The noble link will require you to contact them to see if they have anything or alternatives. I'll see what else I can find.

Plenty of choice on Amazon but you need to measure the bush size (threaded part) for diameter and height, also the spindle length, diameter and whether the knob fits on splines or split shaft. Japanese tend to have 6mm spindles where American guitars use 1/4inch. Splines come in 18 or 24 flavours mostly and I think all current audio tapers are now 15% as opposed to earlier versions being 30%. So it should be easy to find the correct one.

An Ebay search. "A500k potentiometer" brings up some good quality items in a host of dimensions .
Tokai VSB80 OF, Michael Kelly Patriot custom, Epiphone Elite SG & EB3. 8)

Sigmania
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Re: Volume Pots For My 1981 LS100S Love Rock

Post by Sigmania » Wed Mar 31, 2021 6:52 pm

Thanks. Remember I’m after volume pots, not audio taper.
'79 LS80 GT Reborn, '79 ST100 Springy, '81 LS100S Hog, '81 ST80 Springy, '81 TE120 Breezy, '82 LS120 Love Rock (solid flame maple top), '82 JB50 Jazz Sounds

mdvineng
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Re: Volume Pots For My 1981 LS100S Love Rock

Post by mdvineng » Wed Mar 31, 2021 11:04 pm

Same applies just B500k

Suns been out today, think it fried my brain. :lol:
Tokai VSB80 OF, Michael Kelly Patriot custom, Epiphone Elite SG & EB3. 8)

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