Model?wiring diagram?

[staan]

Hi folks,
 
  I'm about to buy a used alembic bass that has also a 4-pin swichcraft connector for the piezo pickup but there is no cable and i don't know how to test it.
 I don't know what model this is or how old it is.
It's a 4string and the serial is: 86 4202 USA

[staan]

Hi again,
 
 I just found out that it's a 1986 series 1.
 So... is there a special power supply required?
 Can i get the wiring diagram so i can let someone to build one?
 
Thank's

[keavin]

Are you sure it's a 5Pin & not 4Pin Connection,,,,,,,what you might wanna do is install two batteries into the cavity (the bass will work w/ 2 9Volt batteries) until you can get your hands on a power supply cable.........so test it first w/batteries,& maybe later you can order a cable from alembic or one of us club members.

[lbpesq]

Stan:
 
Welcome to the club and congrats on your Alembic.  Piezos?  Are you sure?  Alembics aren't generally built with piezos.  The only exception I've seen is custom guitars where a Roland GK pickup is installed to run a synth.  Keavin's correct - the Alembic power cable is a 5 pin.  If you test it with batteries, don't be surprised if only the neck pickup works.   Older Alembics were wired this way.  On newer ones both pickups work with batteries and the older ones can easily be modded to do so also.
 
Bill, the guitar one

[effclef]

Staan, can you post a photo of it?
 
I wonder if he thinks the humcanceller on the Series 1 is a piezo?
 
EffClef

[811952]

Stan,
 
Actually, if you test it with batteries both pickups will work if you plug stereo headphones into the 1/4 jack, no mod required.  Neck pickup will be in one ear and bridge pickup in the other.  Also, if the bass has LEDs on the neck, they probably won't work without the power supply.  The power supply feeds +9vdc and -9vdc to the bass, and audio returns unbalanced stereo through the cable.  I'm sure there is a schematic on the site somewhere that has the pin-out information, and either Keavin or Dave will probably post a link to it.  The Alembic power supply has the audio breakouts (Neck, Bridge, Both) and is an elegant unit.  
 
John

[staan]

Thank's all of you...
First of all , i installed two 9Volt batteries and then pluged it with a mono 1/4jack in a Amek preamp i use in studio.Only the neck pickup worked.
Then i pluged a stereo 1/4 jack and both pickups are working.Every pickup has its own volume,-frequency- and (frequency)gain- Knob.So 3Knobs for every pickup, a Master volume and a switch with 4positions (bridge,both,neck...and??..mute)
 Regarding piezo i thought it might be one because of the four adjustment knobs on the back of the body (those ones you adjust with the screwdriver)
 I wonder what signal i can get from that connector?

[811952]

The four adjustment screws on the back are:
 
neck pu gain
humcancel
humcancel
bridge pu gain
 
The output is adjustable up to about 1 volt (line level), and will drive a set of headphones quite nicely.  Even though there are not very many controls, you will discover that you have one of the most tone-flexible instruments on the planet.  Enjoy!
 
John

[keith_h]

You say that you have 3 knobs for each pickup? This would make the bass a Series 2. The controls would be volume, low pass filter frequency and CVQ .
 
 I wonder what signal i can get from that connector?
The 5-pin connector will give you the same output as  the stereo 1/4  jack and it will replace the batteries. If the bass has LED's in the neck it will also light those. To use the 5-pin connector you will need a chord and the power supply (a blue colored box).  
 
Keith

[staan]

Here some pictures.......

 

 

 

 ...what are those knobs? ...and what about the 4-th position of the switch in the picture below...?

  Thank's, Stan

[staan]

...Thank's John....
 
 so now i know what those screws are for...
 
 And what about the model....
 Is it a series 1?
I thought so because there is no letter in the serial... It's 86 4202
 
Stan

[olieoliver]

Look like a Series II to me.

[lbpesq]

Stan:
 
It's either a Series II or a Seies I with Series II elecronics.  I'm sure someone around here will shortly be by to give the definitive ruling.  The trio of knobs for each pickup is a gain (volume); a low pass filter (filters out frequencies above where it is set); and a CVQ - continuously variable Q swith.  This adds a boost at the frequeny cut-off point as set by the Low Pass Filter.  On a Series II I believe it is variable from 0 to 15db boost.  As for the 4th position on the pickup selector switch, in the words of Ed McMahon You are correct sir!  The 4th position is, inded, a mute.  Don't confuse this with an on-off switch.  Even in mute the batteries will drain if you are running without the power supply.  The batteries are turned on and off by plugging and unplugging the 1/4 jack.  Don't expect a lot of time with the batteries.  If you search around this site you'll probably find claims of 10-40 hours battery life.  This is a top-o-the-line instrument.  Enjoy it.
 
Bill, tgo

[staan]

Thank's Bill,and also to Keith and Oliver.
 
About the serial,(86 4202) i guess it still means it's a 1986 model,even if it's a series 2....or not?
 Otherwise i think finding out what year it was made could be difficult....
 
Stan

[dadabass2001]

Hello Staan,
You are right about the ID number as well, the instrument was made in 86, based on your read of the serial number. It appears your top wood is Zebrawood.
Also check  of the FAQ section on this board for info on adjusting the trim pots on the back of the bass if they need it.  
Mike