MUSICMANBASS.GLOBAL
MUSICMANBASS.GLOBAL 

Formerly MUSICMANBASS.ORG

 

SR4 PUPs AND PREAMPS 

Pre-EB & EB (Part 2)



EB 3EQ PREAMPS (1987 - Current)

Circa 1987 to circa 1990 (3 band) Option.

Pic of a 1988 3 Band EQ Preamp.

Ernie Ball introduced the optional 3 band pre-amp in 1987 and is an option to date. The same preamp was included in the new SR5 latter in 1987. Note that, although the two outer pots are hook-up wiring lug pots, the two inner pots are soldered to the circuit board by pins attached to the pots. Note also that the preamps are dated with a round sticker on the rear of a control pot from 1988 onwards. Prior to this some were dated with a black marker pen on the rear of the control plate. The 3 band uses a "TL062" chip rather than the "LM4250CN" used with the 2 band preamp.

Reproduced with permission. Schematic wiring for 3 band
preamps from circa 1987 up to circa 1990.

Circa 1990-October 2006 (3 band) Option.

Pic of a 1994 3 Band EQ preamp.

Just like the 2 Band preamp, the 3 band preamp circuit board also changed from rectangular to crescent moon shape. Note that the two outer lug pots on the previous 3 Band version (above) are now soldered on the board. The circuit still remains the same as do pot resistance values.

Reproduced with permission. Schematic wiring for 3 Band preamps
from circa 1990 to Oct 2006.

October 2006-July 2018 (3 band) Option.

Pic of an Oct 2006 3 Band EQ preamp.

The circuit remains the same and continues to use the TL062 chip. Pot resistance values also remain the same but the previous larger pots are replaced by smaller "Noble" pots.

July 2018-current. New revoiced 18 volt 3EQ.

With the next generation Sting Ray Special light weight, introduced July 2018 and replacing the regular SR4, the 3EQ preamp above is replaced with a new revoiced 3EQ 18 volt preamp. The control plate is now aluminium (chrome or black). The pickup now has Neodymium pole pieces rather than Alnico.

Back to Part 1: HERE