The STC3M4 bass preamp

eastcoasteddie

New member
Hey, there. This is my fist post here. I'm not a heavy-duty pickup-swapper, but I have had the pleasure of using a few different pickups, and I find that Duncan 's are one of the best in the aftermarket.

That being said, I'm considering the STC-3M4 Music Man preamp for my Stingray 4 with 3-band eq. I bought the 'Ray brand new in '94 and it served me well for the last 15 years. But after acquiring a few more basses, I'm finding the stock preamp a bit lacking in overall "fullness" compared tot he others....to the point that I'm not sure I like its sound anymore. It has its signature bright tone and in-your-face attack, but it seems that the way the preamp is voiced, it doesn't stray much from that. I've read that many people dislike the 3-band version because of this, and the 2-band preamp is voiced with much better overlapping frequencies. It is a cut/boost type; and I feel that when the tone knobs are set just past the center detent is where the most difference of tome comes in. Anything past 1/4 of the way past detent yeilds very little change. I can't bring myself to part with it because it's pretty much the first bass I ever bought. I've used borrowed or stolen basses in the beginning, but this one is mine.

So I'm thinking of getting another preamp that has a great deal of tone variation, but yet allow me to keep that Stingray sound as much as possible. It sucks that nothing is available fron Ernie Ball as a swap out. They'll only sell you a part if you return your part as a broken unit. They won't sell you a new pickup or preamp outright.

Is the STC-3M4 3-band voiced close to the stock stingray? Also, I'm concerned with the module size. No size specs are printed on the Duncan site for this preamp. I read somewhere that the STC-3 (non-music man preamp) measures 2.5" x 1". But I don't know the size of the 3M4 preamp, so I'm not sure it will fit into the stock control cavity. I am NOT willing to do any routing on the bass to accomodate.

I sent an email to Duncan asking about the size of the module 3 days ago, but still haven't gotten a response.
 
Re: The STC3M4 bass preamp

Welcome to the forum.

The STC-3M4 PCB measures 1 x 1/2 x 2 & 7/32 inches. The velcro pad to which it attaches is larger but can easily be cut down to fit.

IMO, the SD Basslines EQ does not sound the same as the EB/MM. This, of course, is precisely why you may be interested in it. When I first tried out the STC-3A, I found it almost too subtle. Eventually, I sussed out what the designers intended and have enjoyed the system ever since. The STC-3M4 should be similarly unfamiliar to begin with but fine once you attune your ears to what it offers.

I have two Stingray basses, one 3-band EQ with centre detents, one 2-band EQ without. I agree with your comments about the "flat" EQ setting on the 3EQ being the last one I would chose to use. After several years of ownership, I find myself setting the 3EQ to emulate the sound of a passive Fender Bass. D'oh! Meanwhile, on the 2EQ bass, I just judge by ear.

I ought to point out that my 3EQ Ray is fretted, ash, rosewood whereas my 2EQ is fretless, alder, Pau Ferro. Equally importantly, the ash bass has the modern EB/MM bridge whereas the fretless has the earlier style with the adjustable mutes. Stingray owners could debate the relative merits of the two bridge designs for days.
 
Re: The STC3M4 bass preamp

My Stringray is Ash/maple. I had a Fretless JUST like it, but I traded that for the G&L L2500 I have. That was probably THE BEST fretless I ever played. Sounded amazing; I wish I still had it...

DSC_0594.jpg


I was considering either this preamp or an Aguilar OBP-3 with the push-pull mid frequency. But I also read a lot of people saying that any "upgrade" to a Music Man, is not really an upgrade at all...
 
Re: The STC3M4 bass preamp

If you decide to get that preamp I have one forsale on eBay right now that I never got around to installing. It is in new condition.
 
Re: The STC3M4 bass preamp

So I decided to try the Duncan Preamp. It'll be really easy to change where I don't think I even have to unsolder the existing input jack from the original preamp. The only unsoldering I'll have to do is on the 2 pickup leads and the battery terminals. Everything else can ber removed with one swipe...

I'll update after it's installed, maybe even do before & after sound clips or even video, since I got a new digital camera, too.
 
Re: The STC3M4 bass preamp

Got the preamp, bought it from ericmeyer4. The complete job of removing the stock preamp and installing the Duncan preamp took about an hour or so.

I was surprised at how small the module is, almost looks like it won't doo much for sound enhancement...

P1020112.jpg


It fits in the control cavity perfectly

P1020114.jpg


and the best part is, that it looks like nothing was modified on the bass

P1020119.jpg


How does it sound? freakin' fantastic!!!!

here are a couple of sound clips.

First, the stock 3-band Stingray EQ. I kept the treble cut just a little, to keep it from sounding too harsh:

http://www.mediafire.com/?tikfyzv5zzz

and pretty much the same stuff played with the Dincan Preamp. I hit the "slap contour" switch towards the end, gives it a real nice sound.

http://www.mediafire.com/?mjez5cggmtc

I am pleasantly surprised with this preamp...makes me want to buy another one to pit into another one of my basses...
 
Re: The STC3M4 bass preamp

After playing with this preamp for the last couple weeks, I'm REALLY starting to love it. I sometimes have the urge to put the original pre back in for originality's sake, but I just can't get over the clarity and deep lows that the Basslines pre has. The beauty of this preamp is that I can get it to sound 95% like the original preamp by boosting the MID frequency, and it will do a lot more than that. I think it is voiced very much like the 2-band Music Man pre that everyone loves.

One issue that I started to have was noise. I'd get a lot of 60-cycle hum, which would get pronounced when my fingers would touch the pickup pole pieces. I called Tech Support and got Scott on the line. I explained everything and he pretty much confirmed the path I was going while trying to figure out what the deal was.

I'm using the original Stingray pickup, which only has 2 wires, a black and white. One HOT and one GROUND. The pole pieces are not shielded, which is where the noise comes from. If I touched the pole pieces and touched the bridge, though, the noise would stop (grounded). ON the original preamp, the 2 wired solder straight to the circuit board. Tracing the circuit of the white wire, it comes in contact with a couple of capacitors and resistors along the way to ground, which probably cancels out any noise that may be generated. With the SD preamp, the white just solders to a pot casing.

SO if I wanted to get rid of the noise solidly, I should get a pickup that has the poles shielded, like the SD 4MA pickup. But what Scott had me try is to shield the poles quick & easy.

Took 2 strips of shielding tape and gently soldered a wire directly to the tape. I used 2 strips of tape, one for each coil. I soldered one wire connecting the 2 pieces. Then I took another wire through the control cavity and soldered it to that wire soldered to the tape, and soldered the other end to ground. Noise is totally gone and everything is super quiet.

After doing the job, I figured that I will do it again with less tape and make it neater...right now it looks like @$$ because I was experimenting.

I was also getting a lot of static discharge from touching my pickguard...which never happened with the old preamp. I'm wondering if the old preamp somehow dissipated static buildup, too. But when I shielded the poles, about 60-70% of the static noise went away, I still get some, but very quietly and is unnoticeable when playing. Before the shielding, I could hear it big-time, and it SUCKED!

I'll re-do my shielding job and take pics.
 
Re: The STC3M4 bass preamp

thanks for the quick answer, I live in argentina, shurely shielding tape can be find in here, but I can´t, I got 2 options, 1 es buy it from amazon, the other is replace de original MM pickup with the SD bassline.

I´m trying to isolate the hum, here are the picts of what I do yesterday

67057720.jpg


first I cover a live wire and give the shape of the poles, I glue it only between poles and cover that with aluminium foil and aislant tape, to
shield the poles, soldered a wire through the control cavity and soldered it to grownd, noise is still heard.

54754089.jpg



tonigth I'll re-do my shielding job, but I don´t know whats wrong, I love the STC3M4 bass preamp, much more thant the original MM preamp, but I need the bass to record and hum is a bad thing.

thanks
 
Back
Top