Vintage Guitar and Bass forum

EB-2 wiring diagram

EB-2 wiring diagram
« on: December 03, 2010, 07:35:27 PM »
Hello All,

Just joined the forum.

I have a 1968 EB-2 that needs a little help.  Everything works fine but sounds like maybe a grounding issue. I have a pretty good buzz going (yeah...the guitar). I'm going to try to pull everything out and clean pots, re-solder, etc.  

Anyone have a wiring diagram?   I found the schematic on the Gibson site, but  I'm not much of a schematic reader.    Also, any other suggestions for a tune up on the electronics of this guitar?


EB-2 wiring diagram
« Reply #1 on: January 13, 2011, 10:20:04 AM »

First post here!

Me to have a 1968 EB 2, It also has some noise especially with the bariton button in the "not so much bass" position.

I took it to a Gibson repair shop and they told me I had to live with this amount of noise, and they could not make it better. Is yours very bad?

"When the music plays you can not hear it"  

So now I live with it :-(

Just to inform you before you tear everything apart :-)
Gibson EB 2 [1968] - Gibson SG Standard Bass [2010]
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EB-2 wiring diagram
« Reply #2 on: January 13, 2011, 03:53:07 PM »
If you can avoid pulling everything out, do so.  Track your ground problem.  What is the nature of the buzzing?  If you take your hands off the instrument, does it buzz.  Does it stop when you touch the bridge?  The choke button?  The pickup?  Are those things sharing a common ground connection?

The Gibson repair people probably did not want to deal with the HORROR of pulling the wiring out of these things.  I have done it several times, and trust me, it sucks.  Plus they have very often been monkeyed with.  Is the choke still hooked up?  That gets yanked a lot.  Sometimes it is easy to fish the wiring out to re-hook it up, and sometimes the choke is clipped off, or dug out.  And any messing around runs the risk of breaking the ground wire from the bridge stud, as it was/is typically bare utility wire and easily snapped off.  If that happened, you have to pull the treble side bridge stud.  Oy!

There are basic wiring diagrams that I can post, but if you are going to wade into the very fire of hell by re-doing it all, then I strongly suggest you consider doing sleeper mods while you can.  As long as you add no holes, or lose the parts, you don't really do any harm, and it makes the bass more fun for sound.  The EB2 has lots of room to play with.

EB-2 wiring diagram
« Reply #3 on: January 18, 2011, 09:29:37 PM »
Hey all,

Thanks for the replies.  Yeah, getting the buzz when I take my hands off the strings.  At one point I had a wire that I connected to the string end ring and I tightened down the bridge cover on the other end.  My picking hand was always touching the bridge cover (when using a pick) and that killed the buzz.  

I have since pulled the wiring harness out completely.  It's a mess, there are some extra capacitors in there that shouldn't be.  Rather than mess with it, I'm just going to set the wiring/pots/choke aside (with intent of putting it back should I sell it some day...I have taken lots of pics).  

I think I'm just going to wire it up with new pots ....250k tone pot with orange drop capacitor and 500k volume pot to the original pick up.  
I'm a bit confused about the wiring leading to the pickup though.  I will post a pic later with my question.  


EB-2 wiring diagram
« Reply #4 on: January 20, 2011, 04:06:36 AM »
EB2 controls


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Gibson EB2 / Epiphone Rivoli wiring
« Reply #5 on: March 08, 2011, 03:47:49 PM »
I have finally posted a simplified circuit illustration of the EB2 / Epiphone Rivoli based upon 3 basses I have studied (two Rivolis and one EB2)
All had the same circuit. I've posted the picture twice, though it is actually identical
Gibson EB2 circuit schematic / wiring illustration
Epiphone Rivoli circuit schematic / wiring illustration

EB-2 wiring diagram
« Reply #6 on: March 09, 2011, 01:58:42 AM »
Love the simplified circuit illustration!

Dave W

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EB-2 wiring diagram
« Reply #7 on: March 10, 2011, 02:02:36 AM »
Yes, great work on those, Jules.

Epiphone Rivoli
« Reply #8 on: April 19, 2011, 09:29:26 AM »
I've been having a similar problem with my epiphone rivoli bass.  Now I'm regretting selling my Gibson EB-2DC even if it was a factory 2nd...  Here's a link to the ongoing problem.  Any help/suggestions would be greatly appreciated!  I had my tech try the wiring diagram from flyguitars, but he said it didn't work.  I'm thinking he did it wrong or perhaps I got the wrong capacitors/resistor.

Basically I've had it rewired with new pots, cut out the baritone switch, and a new pickup but I'm still getting a hum and it won't produce any sound when the volume is past 8.  The hum also gets a lot louder when the volume knob is past 8.  Right now the tech has it wired straight without any capacitors/resistors so that could part of the problem.  If anyone has one of their rivoli/eb2 basses opened up can you please take some pictures of the wiring,  I'm hoping I'll see something I'm missing.
Thank you!!
« Last Edit: April 19, 2011, 09:46:01 AM by mydeadblues »

EB-2 wiring diagram
« Reply #9 on: June 20, 2016, 12:31:27 PM »
Related question/issue and I thought I would start here vs. create a new thread...

I am babysitting an early 1960's Rivoli.  The baritone switch is broken, and seems to be stuck in the "off" position.  My understanding is that this is a two-position switch (either "Baritone" or "Off"), but the off position still leaves the choke in the circuit, which can make the sound muddy.  The schematic on this page seems to confirm this:  In either switch position the choke is in the circuit.

However, the physical layout diagram on the same page seems to imply that the choke and the .02 cap are out of the circuit if the switch is "Off".  Is that a mistake or an alternate wiring?

I am thinking of going in and "cleaning up" the circuit by taking the choke and cap out of the circuit when the switch is "off".  Should I also take the 220Kohm resistor out?  Or does that resistor simply change the effective resistance of the tone pot if the tone pot is 500K?



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