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Discussion Starter · #1 ·
Hi!
I have a charvel model 4 with the kahler and dot inlays, i have all the parts for it now, and i got the thing re-wired and i love the way the neck feels but i still have a few problems i would like some help with.
1)
Whenever its plugged in, it has this really loud, annoying hum (With my distortion on) and i would like to know what exactly that issue is please. I was told its just from having the mid-boost all the way up.
2)
My pickups sound dull, i was told that most of the model series were active, but mine has no spot for a 9V Battery anywhere, unless im just too stupid to see it. If you could answer that for me, that would be great. Thanks!
 

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I would check for loose wiring for the loud hum - just make sure everything is solidly connected. None of the Model series guitars had active pickups stock,and I'm fairly certain (90% or so) that none has the JE-1200 preamp/boost either.
If you have a maple board and black dot inlays, it's a Modsel 4M.
 

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Discussion Starter · #4 ·
I would check for loose wiring for the loud hum - just make sure everything is solidly connected. None of the Model series guitars had active pickups stock,and I'm fairly certain (90% or so) that none has the JE-1200 preamp/boost either.
If you have a maple board and black dot inlays, it's a Modsel 4M.
Its a Rosewood board with Pearl dot inlays.
All the wiring in the back just looks confusing ha, im not very good with this stuff.
There are a few things that look like they werent all the way sautered...not sure what to do.
 

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First thing to try is plug in a different guitar to determine if it's the guitar, cable, or amp making the noise. If the other guitar also makes noise, it's not the guitar, so change to a new cable, and so on.

One other thought; If memory serves, the charvel model 4's had shark tooth inlays, not dots. Are you sure it's not another model?
 

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Model 4s with Kahler had dot inlays. They didn't start having sharktooth inlays until they start putting Jackson JT-6 (Floyd type) trems on them.

Regarding the active electronics, Model 4s came stock with the JE-1200 mid boost preamp, J50BC (moderate output, ceramic magnet) and J200 stacked single coils that were designed to be used with an active circuit.
 

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Discussion Starter · #9 ·
Well, I was just given the information that they are active pickups, i just need to put on the cap thing that attatches to the top of a 9V. I have one of those, i just do not know where to sauter it at, there are only 2 lose wires, but they are taped together at the top, im guessing those two are for the battery?
Its two thinner black wires, and one green one thats thin. Im guessing the two thin black are the single coil and then the green is the bucker?
 

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I would check for loose wiring for the loud hum - just make sure everything is solidly connected. None of the Model series guitars had active pickups stock,and I'm fairly certain (90% or so) that none has the JE-1200 preamp/boost either.
If you have a maple board and black dot inlays, it's a Modsel 4M.
I have a stock Model 4M that most definitely came with active pickups. Bought it new in '89. All model 4's and 6's had active pickups and the mid-boost as well. That was their deal. Read the link you posted for the model 4 pickup description.

Control Functions:
One Volume, One Tone, Jackson Pre-Amp with Mid Boost, Three 2-way mMini-Toggles
Pickup Specifications:
Model Number: J200 (two)
Description: Dual Coil, Bi-level
Humbucking designed for use with
active circuitry.

"clearer" distortion.
Sr.(in K Hz): 9.90
Z (@Sr in MOhms): 1.8
Inductance (in Henries):2.4
Q (@Sr): 12.6
Output Level (@ Sr): +44.1dB
Magnetic Structure: Alnico V
Resistance (in KOhms): 11.65

Pickup Specifications:
Model Number: J50BC (one)
Description: High Frequency Bridge
Position Humbucking. Designed for use
with active circuitry.

Sr.(in K Hz): 6.58
Z (@Sr in MOhms): 5.9
Inductance (in Henries):5.3
Q (@Sr): 2.64
Output Level (@ Sr): +56.4dB
Magnetic Structure: Ceramic
Resistance (in KOhms): 8.58
 

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This is really pretty simple: "Designed for use with active circuitry" does not mean they are active - it just means they are slightly lower output and so therefore (according to Jackson) designed for use with an active, onboard preamp. A lot like like damned near every Bartolini pickup as well. And, surprise, these guitars did come with the JE1200 preamp on board. Personally I don't think they need the preamp and stripped the JE1200 out of all of my Model 6's, but that's just my opinion.

Model 4's and Model 6's DID NOT come stock with active pickups. The only way active pickups can get in them is if you or another previous owner put them in there.
 

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Model 4's and Model 6's DID NOT come stock with active pickups. The only way active pickups can get in them is if you or another previous owner put them in there.
Wrong. They did come with them stock. I bought my Modal 4 with a Floyd, shark tooth inlays, and Jackson EMGs.
 

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Wrong. They did come with them stock. I bought my Modal 4 with a Floyd, shark tooth inlays, and Jackson EMGs.
So, how many batteries did it come with stock then?

Let me take a wild guess here, but your "Jackson EMGs" had EMG like covers on them, and said Jackson on them as well, right? Like this one?

 

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It came with a 9V. I was embarrassed because I had no idea where to install it, because it was the first guitar that I had with active electronics.

My Model 4 looks like this, only in black:

 

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That 9 volt is for the JE1200 boost, those pickups are passive - they just have covers on them. There's a difference between 'active electronics' and active pickups, though the phrases are sometimes used interchangeably. What's active in the electronics is the powered boost in the guitar, and it uses a battery. The master volume and master tone pots are passive like the pickups.

Tons of Carvins come with active electronics (the DC400 pops to mind) as well. The pickups are covered just to make them look '80's cool, like EMGs I suppose. The J200 singles are stacked humbuckers, maybe they're ugly without the covers.....They may look like EMGs, but they aren't the same thing at all beyond the look. Jackson always used real EMGs when they used actives, the passives they either made themselves or bought from others.
 

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Cool. I always thought they were EMGs because I could NEVER get those pickups to get that nasty feedback, even when standing right in front of the amp.
 

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I'm not 100% sure about the JE1200's battery use, but if you change the battery and bang up the boost it should get pretty snarly. Also, the battery may drain when the cable is in on these, so don't let her sit on a stand plugged in if you can help it :)
 
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