Preamp for L2000?

Bass mods, tweaks, and the like are home in here. Got an Evil Experiment to share? Pull up a keyboard and have at it!

The EBA is hosted by deltafred, a UK based pro player and electronics guru.

No sales or advertisements, no matter how well veiled, are permitted - not even a pointer elsewhere.

Moderator: deltafred

Re: Preamp for L2000?

Postby Karl Kaminski » Wed Nov 29, 2017 10:19 am

Mr. Mom wrote:Oh, and I've got some new knobs on the way, too.

I'll post a pic when it's all put together.




Any pics? Im thinking about "fitting" my Pope pre. If I were to keep it in there, I'd have to go with a "toggle-hole conversion" Im interested to see what you ended up with in there. (i'll run it "open-gut" to experiment... ill post a pic during my holiday break)

thnx
Karl Kaminski
 
Posts: 34
Joined: Thu Nov 09, 2017 9:44 am
Location: NYC

Re: Preamp for L2000?

Postby Mr. Mom » Wed Nov 29, 2017 1:48 pm

Forgot to post a pic! I'll get on that.

I like the tone of the Aggie preamp. And I really like how the levels are the same in passive and active mode. I switch on the fly without any other adjustments. (Usually keep it in active mode, though.) I also like the eq points. I can cut a little Bass and Treble and then boost 400 or 800 hz and it sounds real good and sits very well in a mix.

What I don't like about the Aggie pre....And this is kind of a big deal to me....Is that turn the Blend juuust past halfway (indent) and you're about 80-90% of the way towards the bridge pickup, blend-wise. Turning it the rest of the way does very little tone-wise. It's kind of hard for me to find that sweet spot. Other Blends on active pre's I've had are far more consistent and intuitive.

I tend to lean on the Bridge pickup quite a bit to cut through (bridge) but still have weight/girth (neck). And I really like finding all those tones that are "between" the pickups, if that makes sense. IOW, I use the Blend as an EQ far more than the actual EQ. It's kind of hard to do this with the Aggie.

IMO, YMMV, etc etc.
User avatar
Mr. Mom
 
Posts: 317
Joined: Sat Jan 17, 2015 6:37 am
Location: Central Ohio

Re: Preamp for L2000?

Postby Ken Baker » Wed Nov 29, 2017 8:40 pm

Mr. Mom wrote:What I don't like about the Aggie pre....And this is kind of a big deal to me....Is that turn the Blend juuust past halfway (indent) and you're about 80-90% of the way towards the bridge pickup, blend-wise. Turning it the rest of the way does very little tone-wise. It's kind of hard for me to find that sweet spot. Other Blends on active pre's I've had are far more consistent and intuitive.


Remember that the blend is actually on the passive part of the circuit, "ahead" or "upstream" of the preamp along with the volume control. Obviously, I'm thinking about the circuit I used when I did my L-2500. Electronically the L-2000 and L-2500 are the same. It's possible that the blend pot may be defective.

Ken...
User avatar
Ken Baker
Site Admin
 
Posts: 4055
Joined: Sat Oct 10, 2009 9:33 am
Location: Behind The Orange Curtain

Re: Preamp for L2000?

Postby Mr. Mom » Thu Nov 30, 2017 5:11 am

Ken Baker wrote:
Mr. Mom wrote:What I don't like about the Aggie pre....And this is kind of a big deal to me....Is that turn the Blend juuust past halfway (indent) and you're about 80-90% of the way towards the bridge pickup, blend-wise. Turning it the rest of the way does very little tone-wise. It's kind of hard for me to find that sweet spot. Other Blends on active pre's I've had are far more consistent and intuitive.


Remember that the blend is actually on the passive part of the circuit, "ahead" or "upstream" of the preamp along with the volume control. Obviously, I'm thinking about the circuit I used when I did my L-2500. Electronically the L-2000 and L-2500 are the same. It's possible that the blend pot may be defective.

Ken...


Oh. So the Aggie Blend is passive? Like replacing the two volumes on a passive Jazz bass with a passive blend? I had not thought about that. I just ASSumed it was an active blend. And that would explain why I seem to get a pretty big passive-jazz-bass-with-both-pickups-all-the-way-up kinda tone with the Blend centered. Which I like! (I'm using that tone quite a bit at a contemporary Christian Christmas show where the bass is phhaaaat and phhuuul.) AND, that would explain why I seem to get more of that passive-jazz-bass-with-both-pickups-all-the-way-up kinda tone than I have with basses with active blends.

I must be used to "active blends" where both pickups are "on" 100%, 100% of the time and the blend is more of a volume knob between the two pickups. At least that's how I understand active blend controls?
User avatar
Mr. Mom
 
Posts: 317
Joined: Sat Jan 17, 2015 6:37 am
Location: Central Ohio

Re: Preamp for L2000?

Postby Ken Baker » Thu Nov 30, 2017 6:20 pm

Mr. Mom wrote:I must be used to "active blends" where both pickups are "on" 100%, 100% of the time and the blend is more of a volume knob between the two pickups. At least that's how I understand active blend controls?


Yup. "Active" blend would be a function of the preamp used.

Here is what feeds the OBP-3 in my L-2500:

Image

The pickup select switch, which could easily be swapped out for a smart blend, is in its usual place; just after the coil switch. The volume control is also in pretty much the same position in the circuit as stock. From there it's on to the active/passive switch which feeds either the preamp or the jack (with the preamp totally isolated and grounded).

The OBP-3 does gain (for the most part) via the EQ controls. With all three centered there is very little gain, though the Aguilar voicing is present. Gain increase or decrease is a function of EQ. This is all very much like what Paul did with the preamps for the M series basses.

Ken...
User avatar
Ken Baker
Site Admin
 
Posts: 4055
Joined: Sat Oct 10, 2009 9:33 am
Location: Behind The Orange Curtain

Re: Preamp for L2000?

Postby Mr. Mom » Fri Dec 01, 2017 10:37 am

Ken Baker wrote:This is all very much like what Paul did with the preamps for the M series basses.


Oy.....Which of course fuels my M2000 GAS. I'd prolly really dig the M2000.

Thanks, as usual, for the edumacation, Ken! Much appreciated!

Overall I'm happy with the Aggy pre. Using the preamp "color", with the EQ set flat, just plain works for me. It thickens the tone while also cutting through. Cliche terms but that's how I hear it.

I've been using this signal chain as of late and really dig it: Bass to MXR M87 Comp to MXR Bass Octave Deluxe to Aguilar THDI to Grace Felix. That signal sounds pretty freakin' glorious. The Grace Felix (and Alix and Bix) have custom wound transformers on the DI out that are, IMO, the best thing since sliced bread. They sound stupid good. I can also use the Felix's second channel as a really nice IEM amp for my IEM gigs. The MXR BOD only gets used at my church gig(s). I can kick it in and pump up a chorus or bridge whenever needed. Tracks my basses extremely well for an analog octaver. I just love the tried and true THDI. Sounds silly, but my stock setting is the AGS engaged, Gain allll the way down, EQ flat except some Treble roll-off, and Master set to unity. The M87 is my latest try at using a comp. I've had a few but never bonded with one. Until the M87. Very intuitive and easy to use. Really does help with adding weight and separation to individual notes without losing dynamics.
User avatar
Mr. Mom
 
Posts: 317
Joined: Sat Jan 17, 2015 6:37 am
Location: Central Ohio

Re: Preamp for L2000?

Postby mattrudy » Wed Apr 11, 2018 7:46 pm

Ken Baker wrote:
Mr. Mom wrote:Ken, what's the layout of the knobs and switched with your 2500?


Image

Switches:
    Standard pickup select
    Series/SC (outers)/Parallel
    Active/Passive

Knobs:
    Volume
    Mid (300Hz center)
    Stacked bass & treble

This is the circuit used. It only shows the feed to the OBP-3, which uses Aguilar's layout. Note that the active/passive switch fully isolates the preamp when in passive mode.

Image

Ken...


Did the preamp come with the new knobs or did you have to buy those from somewhere else?
mattrudy
 
Posts: 7
Joined: Tue Dec 29, 2015 5:37 am

Re: Preamp for L2000?

Postby Ken Baker » Wed Apr 11, 2018 7:55 pm

mattrudy wrote:Did the preamp come with the new knobs or did you have to buy those from somewhere else?


The knobs were purchased elsewhere. Maybe Parts Express?

Other than John East preamps that come on a Jazz plate, I don't know of any third party preamps that come with knobs. Pots, yes. Knobs, no. It's a subjective thing that the player gets to choose.

Ken...
User avatar
Ken Baker
Site Admin
 
Posts: 4055
Joined: Sat Oct 10, 2009 9:33 am
Location: Behind The Orange Curtain

Previous

Return to The Experimental Bass Association

Who is online

Users browsing this forum: No registered users and 2 guests

cron