Music Man Stingray Preamp

Sweetalk · Post by **Sweetalk** » 14 Jan 2010, 21:11

Hi all!, this is not an stompbox but it's a very interesting circuit. Here are some pictures, when I return from my vacations I start the tracing. Helps is welcome!!

The IC it's a Motorola TL062CP

sinner · Post by **sinner** » 14 Jan 2010, 21:21

Hi

Thanks for that, can you extend red line on the last photo to green line and tell me how long it is in mm's?

Thanks
Pawel

lolbou · Post by **lolbou** » 14 Jan 2010, 21:22

Ever been through this viewtopic.php?f=13&t=431&hilit=sabre? Anyway, I think it's been done already http://pds.exblog.jp/pds/1/200705/26/62 ... 322510.gif... 'Course it might be checked and a layout could be drawn if needed!

Thanks for the inside pics ("my" bass player don't really like to have his basses opened...) though.

Edit: and nice stuff here http://www.musicmanbass.org/mycustompage0019.htm...

Silent Fly · Post by **Silent Fly** » 14 Jan 2010, 21:35

lolbou wrote:(...) Anyway, I think it's been done already http://pds.exblog.jp/pds/1/200705/26/62 ... 322510.gif(...)

Interesting thanks!

Do you know why some components are in a blue rectangle?

Sweetalk · Post by **Sweetalk** » 14 Jan 2010, 21:38

lolbou wrote:Ever been through this viewtopic.php?f=13&t=431&hilit=sabre? Anyway, I think it's been done already http://pds.exblog.jp/pds/1/200705/26/62 ... 322510.gif... 'Course it might be checked and a layout could be drawn if needed!

Thanks for the inside pics ("my" bass player don't really like to have his basses opened...) though.

Edit: and nice stuff here http://www.musicmanbass.org/mycustompage0019.htm...

I checked those but are from the Sabre, this is the Stingray

, unless they're the same circuit but with different IC

. This one has Bass, Treble and Mids.

I made a Layout for a vintage Stingray pre, I post it later (with Bass and Treble controls).

lolbou · Post by **lolbou** » 14 Jan 2010, 21:46

Read better, the original Stingray Bass preamp is here as well...

Silent Fly wrote:Do you know why some components are in a blue rectangle?

Nope, no hablo japano

...

Sweetalk · Post by **Sweetalk** » 14 Jan 2010, 21:50

lolbou wrote:Read better, the original Stingray Bass preamp is here as well...

Silent Fly wrote:Do you know why some components are in a blue rectangle?
Nope, no hablo japano ...

Ups!!! I didn't saw it

george giblet · Post by **george giblet** » 15 Jan 2010, 11:33

http://pds.exblog.jp/pds/1/200705/26/62 ... 322510.gif

Looks pretty good. This schematic is slightly different to what I've seen and checked over in the past.

It shows:
- Input filter 130k not 150k
- Middle resistors 3k6 not 3k9
- Bass resistors 6k2 not 6k8

Are these variations in the newer models or mistakes?

The blue lines surround parts which affect the bass response. Many moons ago a Japanese guy had a site which modified these parts, it could be the same guy or a spin-off schematic.

HENK · Post by **HENK** » 17 Jan 2010, 13:18

Hello!
Is it possible to need it as a Standalone/Stompbox Preamp?
Greets Thilo

quaternotetriplet · Post by **quaternotetriplet** » 29 Jan 2010, 07:20

anyone who have redrawn the scheme? can save the one posted on the japanese site.

mictester · Post by **mictester** » 29 Jan 2010, 12:34

quaternotetriplet wrote:anyone who have redrawn the scheme? can save the one posted on the japanese site.

Please do!

pedalgrinder · Post by **pedalgrinder** » 30 Dec 2011, 14:36

hmmm interesting high pass filter with tone stack to stop feedback and to get full sound out of it once filtered

deltafred · Post by **deltafred** » 30 Dec 2011, 22:41

The high pass filter straight after the pickup is to protect the speaker/s if you damp the strings with your hand. It is a nice feature to be built into a bass, most don't have that. It is amazing how much the speaker jumps when you do that without a HPF, especially if you have a bass amp that is good down to 10Hz (+/- 3db). Without looking it up I believe it is 12db/octave roll off.

It is quite surprising the MM 3 band preamp gets such a bad press compared to the older 2 band (see the Baja thread) among bass players as it is a really nice preamp but I suppose it is down to nostalgia, mojo and the general trend to prefer older instruments or designs to newer ones . I have both 2 and a 3 band MM basses and like them both equally but I am not one to be swayed by popular opinion and make my own mind up.

I thought I had a redrawn schematic but it is incomplete. If I get it tidied up before someone else posts it then I will.

pedalgrinder · Post by **pedalgrinder** » 12 Jan 2012, 14:24

how would you go about putting a preamp like this in a bass that has a dual pickup like a precision bass and a single pickup back further like a jazz bass. or are you pushing shit up hill. does it only connect to the one pickup?

deltafred · Post by **deltafred** » 12 Jan 2012, 14:50

A word of warning, I simulated the hand drawn circuit given above as I was considering using it in a rack mounted preamp. For some strange reason only the treble control affects the frequency response, the middle and bass do nothing.

The schematic looks ok to me at first glance but I haven't had time to get to the bottom of it yet so if anyone else fancies simulating it then please do. I don't know if this is a bug in my sim program (QUCS - Linux) or a schematic error.

george giblet · Post by **george giblet** » 21 Jan 2012, 07:14

I'm not sure what is wrong with you simulations. (Maybe there is something wrong with you pot models?)

It's a common circuit and I have simulated this ckt many times. It does work.

deltafred · Post by **deltafred** » 21 Jan 2012, 09:52

george giblet wrote:I'm not sure what is wrong with you simulations. (Maybe there is something wrong with you pot models?)

It's a common circuit and I have simulated this ckt many times. It does work.

Thanks, that is just what I wanted to hear as I couldn't see anything wrong with the circuit.

I am sure I have simulated in the past with no problems. I haven't had a chance to get to the bottom of it yet. My thoughts were that it could be a bug in QUCS or something odd in my file. I will start from scratch, rather than edit an old file, and see if that works.

Music Man Stingray Preamp [schematic]