Musicman/Sterling S.U.B. [schematic]
Posted: 04 Oct 2019, 02:29
Found some pics the other day a put this together.
Sterling SUB Ray4 Bass
The preamp seems to following the Tobias version of the HAZ Labs preamp.
Technically the Bass pot value is unverified but I can't imagine it not being 100kB.
=============================
Wiring
The stock wiring uses a 500k A? volume pot.
Even for stock wiring there are three variations of wire colors.
On the web there's a version which has a 25kA volume pot
this seems to be a mod.
Someone mentioned a 250kA volume pot. That could be an error.
=============================
Stock Wiring Variants
Whatever the wire color variant the pots should be wired according
to the pot pin numbers on the overlay pic.
Pots:
Vol pot 500k(A?)
Treble pot 100kB
Bass pot ? 100kB
The pickup is wired to the wiper of the volume pot (Vol pot 2)
Volume pot pin 3 is then wired to the preamp input.
The bass pot is soldered pcb (contacts along edge of pcb).
Even for stock wire there seems to be variations in the wire colors.
1) ** known good Sterling SUB Ray4 2013
Preamp Input/Vol 3 Green
Treble 1=Green, 2=Red, 3=Orange
Preamp Output/Jack Orange
2) 2013/2014
Preamp Input/Vol 3 Green
Treble 1=Green, 2=Orange, 3=Red
Preamp Output/Jack White
3) some others
Preamp Input/Vol 3 Green
Treble 1=Green, 2=Red, 3=White
Preamp Output/Jack White
=============================
PCB connections along edge of PCB.
1 Red +V
2 White/Orange Preamp Output
3 Black }
4 Black } one of these blacks might not be connect
5 Black }
6 Green Preamp Input
=============================
Sterling SUB Ray4 Bass
The preamp seems to following the Tobias version of the HAZ Labs preamp.
Technically the Bass pot value is unverified but I can't imagine it not being 100kB.
=============================
Wiring
The stock wiring uses a 500k A? volume pot.
Even for stock wiring there are three variations of wire colors.
On the web there's a version which has a 25kA volume pot
this seems to be a mod.
Someone mentioned a 250kA volume pot. That could be an error.
=============================
Stock Wiring Variants
Whatever the wire color variant the pots should be wired according
to the pot pin numbers on the overlay pic.
Pots:
Vol pot 500k(A?)
Treble pot 100kB
Bass pot ? 100kB
The pickup is wired to the wiper of the volume pot (Vol pot 2)
Volume pot pin 3 is then wired to the preamp input.
The bass pot is soldered pcb (contacts along edge of pcb).
Even for stock wire there seems to be variations in the wire colors.
1) ** known good Sterling SUB Ray4 2013
Preamp Input/Vol 3 Green
Treble 1=Green, 2=Red, 3=Orange
Preamp Output/Jack Orange
2) 2013/2014
Preamp Input/Vol 3 Green
Treble 1=Green, 2=Orange, 3=Red
Preamp Output/Jack White
3) some others
Preamp Input/Vol 3 Green
Treble 1=Green, 2=Red, 3=White
Preamp Output/Jack White
=============================
PCB connections along edge of PCB.
1 Red +V
2 White/Orange Preamp Output
3 Black }
4 Black } one of these blacks might not be connect
5 Black }
6 Green Preamp Input
=============================