DIY Stingray 3EQ Preamp

[domdec314]

Originally Posted by MKD

ok one more...i can get either 6.2k or 6.8k resistors in place of the 6.4k one shown...any ideas as to which is best suited?

and - the top left white wire in post #1 goes to the pickup - so is the one that comes off the volume pot the hot output to the jack plug?

cheers, and sorry for all the q's -

ps anyone in NZ have a SD SMB 4a basslines for sale - cheap...?

My appologizes for not labeling those wires. Here's the updated diagram:



The top white wire is the input and the white wire off the Volume pot is the output.

As far as the 6.4k resistor, I think either of those values would be close enough to work considering the tolerances.

[EricssonB]

Since this thread is active, I may as well give credit where credit is due. Made two of this model (blue) and two of 2-band EBMM clone (red).

Thanks for this design. I ended up making my own layout, but it's the same guts. I made threads on them, but I don't feel like looking them up from my phone.

[copressit]

Finally got one of these put together. I have a MM type home brew bass with a Nordy 5.2 in the bridge position that I am using this with. I have a rehearsal tomorrow night and that should tell me what I need to know about this pre amp. I am cautiously optimistic, but I never really know until it sits in a band mix. I really hope this works out, I have been having trouble voicing this bass.Thanks for sharing this with TB Dominic.

[copressit]

Well, the bass and the mid portion on this are fine. the treble frequencys I don't like. There is not enough of the higher frequency content passing for my taste. Is the RC of C8 and R6 controlling this? If so decreasing both values will bring the frequency higher?

[jasper383]

How do the pedals sound using another kind of bass?

Part of what makes a Stingray sound unique is it is that EQ through that pickup in that spot.

If you run, say, a passive P Bass through one of these, how is it any different from running it through just another 2 or 3 band EQ pedal?

[Stealth]

A 2-band EQ lacks the extra frequency band that can be modified and cannot achieve the same tone (unless the extra band is set perfectly flat - provvided it even acts perfectly flat in the 12-o-clock position).
A 3-band EQ would have to have the exact same EQ band types (shelf or peak) with the same center/corner frequency and bandwidth, and it still wouldn't sound the same if they had different op-amplifier chips or the surrounding tone-shaping circuitry.

[Modern Growl]

I have a 3-Band Stinray EQ for sale if anyone is interested - check the classifieds!

[EricssonB]

Originally Posted by jasper383

How do the pedals sound using another kind of bass?

Part of what makes a Stingray sound unique is it is that EQ through that pickup in that spot.

If you run, say, a passive P Bass through one of these, how is it any different from running it through just another 2 or 3 band EQ pedal?

I have two (passive) basses that I play through this and my 2-band preamp. I don't have a Ray, I don't have any other basses, and I haven't owned and other preamp pedals, but I thoroughly enjoy having these around.

So to answer your question, it's not really any different than having a different model, except that they each have their own voicing.

[copressit]

The Dept of Redundancy Dept. has asked me to re-state this question;

There is not enough of the higher frequency content passing for my taste. Is the RC of C8 and R6 controlling this? If so decreasing both values will bring the frequency higher?

[SGD Lutherie]

Originally Posted by copressit

The Dept of Redundancy Dept. has asked me to re-state this question;

Smaller values of C should go higher.

[copressit]

Smaller values of C should go higher.

Ok, can do. But specifically which one/ones?

[bassmeknik]

Originally Posted by copressit

Ok, can do. But specifically which one/ones?

Pretty sure it is the 2.2 that is in series with the wiper of the treble control. Try changing to the closest (lower) value first then the next closest, etc...

[copressit]

I will give that a try. Thanks.

[copressit]

Took the value of C8 down to 1 nf. It seems to be giving me the effect I needed. I will get this bass out live in the next week or so to check, but may consider going even lower than 1 nf.

[EricssonB]

Originally Posted by copressit

Took the value of C8 down to 1 nf. It seems to be giving me the effect I needed. I will get this bass out live in the next week or so to check, but may consider going even lower than 1 nf.

Oh yeah? What's the effect, based on description? More zinginess in the high ranges? That's why I figure from your earlier post.

I've got an extra board already made. May try this?

[copressit]

Yes, the lower C value allowed more of the higher frequency to pass. The problem I had was the top end in a snap/slap tone. The sound seems better balanced and more useable to my ears now.

[domdec314]

I'm thinking about having some PCB's made of this preamp. If there's interest I can probably order a bunch of them.

[EricssonB]

Originally Posted by domdec314

I'm thinking about having some PCB's made of this preamp. If there's interest I can probably order a bunch of them.

Oh hey, it's the OP! Thanks for inspiring this. Been using the hell out of it.

I might take a few just to have on hand, depending on the price per unit. I'd probably run a few as experiments of different frequency routing, with a bunch of switches and stuff.

[copressit]

I would be interested in 3. Thanks for the offer.

[bassmeknik]

Depending on price I would like some...