Stingray aftermarket 2 band pre

[delta7fred]

I've got one built up and installed in my Jaguar bass to replace the terrible stock preamp. It's obviously a 2 jazz pickup setup with the preamp between the pickups and the stock vol and tone controls.

I notice the treble control only works in the last tiny bit of the taper. Everything else is way too dark. I set the volume control on the preamp, a 25K trim pot on the board at unity gain. How can I get the treble more usable? Am I experiencing a loading issue with the jazz pickups and on/off switches? Any ideas? I'm using a reverse audio 1M treble pot and 100K log bass pot, everything else is also stock to the schematic.

If you have no pots or resistors between the pickups and the preamp, just switches, then it shouldn't be a problem.

What do the pickups sound like if you connect them straight to the jack socket, they may just be very bassy.

 

[Rockprocess]

With the preamp bypassed, it sounds and functions just like a regular jazz bass.

Last night I switched the reverse audio treble pot out for a linear pot and the treble control works much better.

 

[Dominic D]

I've got one built up and installed in my Jaguar bass to replace the terrible stock preamp. It's obviously a 2 jazz pickup setup with the preamp between the pickups and the stock vol and tone controls.

I notice the treble control only works in the last tiny bit of the taper. Everything else is way too dark. I set the volume control on the preamp, a 25K trim pot on the board at unity gain. How can I get the treble more usable? Am I experiencing a loading issue with the jazz pickups and on/off switches? Any ideas? I'm using a reverse audio 1M treble pot and 100K log bass pot, everything else is also stock to the schematic.

Forgive me if I'm wrong, but I thought the active tone knobs on the jaguar bass were reversed because of the way they're mounted. If I'm right, you should be using a 1M log and a 100k rev log.

 

[johnk_10]

Forgive me if I'm wrong, but I thought the active tone knobs on the jaguar bass were reversed because of the way they're mounted. If I'm right, you should be using a 1M log and a 100k rev log.

that's exactly correct and that's what used on my custom jazzmaster basses that have Derek's 2 band pre's in them:

 

[UncleFluffy]

Derek's 2 band pre's in them:

Not my pre, Leo Fender's. If it were mine I'd be charging a lot more money for the boards

But it's nice to see them becoming part of such absolutely gorgeous instruments.

 

[delta7fred]

Forgive me if I'm wrong, but I thought the active tone knobs on the jaguar bass were reversed because of the way they're mounted. If I'm right, you should be using a 1M log and a 100k rev log.

+1

I've never had anything to do with a Jaguar bass so cannot help on how the pots are wired but if that is the case then that would explain why the operation of a reverse log pot is very cramped at one end and a linear is better.

If you have a 1M log pot then try that and see if it is better than the linear.

Edit - I've just read johnk_10's post and you need to be looking for a 100k rev log.

 

[SGD Lutherie]

Edit - I've just read johnk_10's post and you need to be looking for a 100k rev log.

If you can't find one, try a linear taper.

 

[Dominic D]

Here's a 100k rev log pot:

Invalid Link Removed

 

[Rockprocess]

Thanks everybody for the feedback, but I think I need a little clarification.

I'm using the stingray preamp, purchased from UncleFluffy, in my Jaguar bass in place of the stock preamp. I was using a 1M reverse log pot for treble and 100K log pot for bass as directed in the bajaman schematic.

Should I be using different pot values?

 

[Dominic D]

Thanks everybody for the feedback, but I think I need a little clarification.

I'm using the stingray preamp, purchased from UncleFluffy, in my Jaguar bass in place of the stock preamp. I was using a 1M reverse log pot for treble and 100K log pot for bass as directed in the bajaman schematic.

Should I be using different pot values?

If you're using the sideways knobs like the ones on johnk's basses, you need to use the opposite tapers from the schematic. You should be using 1M log and 100k rev log.

 

[SGD Lutherie]

If you're using the sideways knobs like the ones on johnk's basses, you need to use the opposite tapers from the schematic. You should be using 1M log and 100k rev log.

You also need to wire up the controls backwards!

 

[Rockprocess]

You guys are the best!

 

[Dominic D]

I'm working on making a 3-band stingray preamp. I started a new thread to keep from muddying this one up.

http://www.talkbass.com/forum/f38/diy-stingray-3eq-preamp-883257/

I could use some help making sure the layout fits with the schematics.

 

[crobasster]

I will ask here too,have a 2-band Stingray and want to know how to make it work also in passive mode?

 

[Stealth]

Pozdrav, crobasster!

Basically, just follow this schematic.

Because of the way the EBMM preamp is built, the only thing you'll be able to do is use the pickup series/single/parallel switch and the blend pot, if you have any of those. Your volume and tone controls won't work and the pickup will be at full volume when the preamp is bypassed.

 

[crobasster]

Hvala,Stealth!


Thank you very much,nice idea,I'll try it,it's just precaution if the battery dies at a gig,not to wait till I change it.

 

[Stealth]

If you know what your MM sounds like normally, you'll hear the change in sound well before it dies out. I've had it happen on two of my basses, the sound gets crunchier, grainier, fuzzier - more distored in any case - than with a full battery.

 

[SGD Lutherie]

Your volume and tone controls won't work and the pickup will be at full volume when the preamp is bypassed.

Al you have to do is remove the 25k volume pot from the preamp, solder a 25k resistor from the preamps output to ground (before the switch) and then wire up a 250k volume pot before the preamp. If you use a blend, that would go before the volume pot.

Now you can switch the bass to passive and still have volume.

If you want to get real fancy, get a dual 25k/250k volume pot and switch between the two when you switch from active to passive.

 

[bassbenj]

Al you have to do is remove the 25k volume pot from the preamp, solder a 25k resistor from the preamps output to ground (before the switch) and then wire up a 250k volume pot before the preamp. If you use a blend, that would go before the volume pot.

Now you can switch the bass to passive and still have volume.

If you want to get real fancy, get a dual 25k/250k volume pot and switch between the two when you switch from active to passive.

Yes there are problems with the Uncle Fluffy (Leo) circuit. I was working on this a while back and put it on the back burner. The issue is if you try to put a 250k volume pot out front the input to the preamp needs a low impedance drive from the pickups. So I changed the circuit around to give it a high impedance input and it sort of worked but had a problem that I forget what it was.

And as you recall, a while back when working on this I also had the brainstorm to replace the treble control with a stacked 1 meg and 250k pot so that one worked the active treble but in in passive mode the treble knob would be a standard tone control. Too cool. Except in spite of much help and suggestions from SGD, I was unable to find a stacked pot of the right values.

So anyway, the passive-active thing has been sort of on the back burner. But I will say this much. If you don't worry about passive bypass, the fluffy preamp REALLY gives you a super Stingray sound, without the usual John East $$$. Which is something that just plain old bass-treble ordinary cheap preamps don't do.

 

[CnB77]

Quick question, might have been answered but I didn't see it. Since these are 2-band preamps only for bass and treble, can you only get a scooped tone with them, or is there some interaction between the bass and treble knobs that also adds mids?