Fodera, Sadowsky, aguilar, and other bass preamps

Stompboxes circuits published in magazines, books or on DIY electronics websites.
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quaternotetriplet
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Post by quaternotetriplet »

Hi anyone who have schematics of an outboard bass preamp??

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Silent Fly
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Post by Silent Fly »

quaternotetriplet wrote:Hi anyone who have schematics of an outboard bass preamp??
+1
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bajaman
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Post by bajaman »

Check out the Music Man preamps on this forum
cheers
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Silent Fly
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Post by Silent Fly »

bajaman wrote:Check out the Music Man preamps on this forum
cheers
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Very interesting stuff.

…but I think quaternotetriplet was thinking to outboard preamps.

Having said that, I think the Sadowsky outboard preamp (no longer produced) is the outboard version of the preamp that Sadowsky puts in his basses.

Not 100% sure about the Fodera outboard preamp (aka Fodera Model 2000) but I think it is the boxed version of the Mike Pope preamp used in Fodera basses.

Regarding Aguilar, I think the only outboard preamp in production at the moment is the Tone Hammer. It is supposed to be very good but, knowing Aguilar, I wouldn’t be surprised if internally, it was a SMD unit in a solid black cube of resin.
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quaternotetriplet
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Post by quaternotetriplet »

yeah i was thinking of outboard preamp. or anypreamp equivalent to those preamps. anybody??

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Silent Fly
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Post by Silent Fly »

quaternotetriplet wrote:yeah i was thinking of outboard preamp. or any preamp equivalent to those preamps. anybody??
This is a great forum and I really like it but I haven't seen too many clean, bass-oriented effects here.

You can find 11 pages of discussion of a booster containing only 1 transistor or the schematics of almost every distortion/overdrive on earth but if you are looking for schematics of boutique bass preamps, I don’t think you will find them here.

I saw a (gooped) board of the Sadowshy bass preamp a while ago and if I remember correctly, it contains only a couple of transistors. It sells at $198-$249.

I look forward to see what these preamps are really made of and if they worth the money they sell for but I don’t think it will happened any time soon.
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lohstah
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Post by lohstah »

FWIW, the aguilar outboard preamp is just the whole epoxied onboard bass preamp mounted in a stompbox. ;-)

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Post by Silent Fly »

lohstah wrote:FWIW, the aguilar outboard preamp is just the whole epoxied onboard bass preamp mounted in a stompbox. ;-)

cheers,
lohstah
You are right lohstah :thumbsup I forgot about that.

The new Tone Hammer is a different beast though.
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quaternotetriplet
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Post by quaternotetriplet »

Any gut shots??

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chicago_mike
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Post by chicago_mike »

Just use quiter parts in a 2 band or 3 band active eq schematic.

All those guys will epoxy their stuff so one risks damage to break open the covered pcb.

Take an swr preamp circuit, remove the tube and use fixed eq points rather than a sweepable freq.

try opa 2134's. a friendly fyi, the "aural enhancer" is a "fender" tone stack, with a blend control.

and other bass pres with a "tonal" balance use a big muff tone control...more suited for bass. I dont know if they have the midrange cut or have the modded circuit for flat response.
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quaternotetriplet
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Post by quaternotetriplet »

hi mike, do you have a schematic of any 3 band preamp?? please post if you have

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Post by analogguru »

Bartolini NTMB ( Bass preamp ) schematic and DIY-project infos:
https://www.freestompboxes.org/viewtopic.php?f=1&t=3833

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Post by chicago_mike »

Thats a good circuit.

Bill also makes it with a 3 way freq shift control for the mids and also an 18volt version..I dont know these schematics or have them though.

another would be the interstellar overdrive schematic at freeinformationsociety. just use the 3 band eq part really.
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quaternotetriplet
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Post by quaternotetriplet »

thanks, is it possible to put it in a box?? make it out board? please tell me how.

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Post by flood »

i have a couple of schematics including one of a wal, they can all be found over at forum.musikding.de but i will upload them anyways. i've also merged two in an attempt to make an onboard preamp for my bass, but have gotten fed up with the project (can't find the right pots in the local market, pain in the ass to find in india) and put it on ice...

will post this info in a day or two... need to find it all again.
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quaternotetriplet
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Post by quaternotetriplet »

I want to see fodera outboard preamp schematics

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Post by Crimson »

I'm interested too...
I've looked on the german forum (i can't speak german) but i can't find anything...So if you can repost here the schematic would be great...
Thanks a lot!

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Post by Brink »

(Also posted to a similar thread at https://www.freestompboxes.org/viewtopic.ph ... t=sadowsky)
Did anyone find a Sadowsky schematic?
I've got a Sadowsky Bass Preamp/DI sitting around, in a unmodded and nonworking condition. The board is SMD and ungooped. Tracing this is beyond my abilities, but if someone else wants to do it I'll mail it to them.

Photos at
http://imgur.com/ocrWG.jpg
http://imgur.com/xBGEU.jpg

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Silent Fly
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Post by Silent Fly »

Brink wrote:(...)
I've got a Sadowsky Bass Preamp/DI sitting around, in a unmodded and nonworking condition. The board is SMD and ungooped. Tracing this is beyond my abilities, but if someone else wants to do it I'll mail it to them.(...)
If I wasn't totally hopeless in tracing circuits I would be very happy to do it.

No volunteers?
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lietuvis
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Post by lietuvis »

Hi
I have compiled SWR and AMPEG preamp circuits in to one I was thinking to build but newer get around,also design pcb for it.If there is interest somebody can build it.pcb made in diptrace software and schem in eagle,somehow it was the way I have done it.can provide diptrace file but schem was loston hdd crash,but saved as image.
Attachments
pre pcb overview.jpg
pre.png

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