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EB3 wiring schematic (series 2)

The second series EB3 schematic applies to EB3s from late 1971 until 1979. In general series 2 circuitry can be identified by the black cylindrical choke - identical to the one employed on the Ripper, and new-style capacitors.

Pots used were initailly two 500K volume pots (unknown taper) (part 70027) and two 250K audio taper tone pots part 70021. These were the pots listed in the 1971 and 1977 parts lists. The 1981 parts list changes these to 300K (linear/special audio taper) 70028 volume pots and 100K audio 70035 tone pots. In each case capacitor and choke values are unchanged.

These part lists (and instruments examined) clearly differ from the schematic shown (300K volume, 250K tone), and it is probable that all three circuit variants exist, and furthermore the precise potentiometer values are not terribly significant in the operation of this circuit, as long as they are matched.

The image shown below shows a very early series 2 schematic, from an early 1972 EB3, with two 70027 and two 70021 pots

Early 70s EB3 circuit    

See the series 1 EB3 schematic



Most recent posts about the EB3 from the Vintage Guitar forums

Gibson EB3 varitone plate wanted - anyone got one? (3 replies) thread started by omvibes on 16/08/2008
Gibson EB3 with Ampeg SVT plus 8x10 (10 replies) thread started by jules on 10/08/2008
Mike watt's EB-3 & the Stooges Equipment stolen??? (14 replies) thread started by Redbird on 04/08/2008
EB3 tone choke removal (19 replies) thread started by barend on 27/07/2008
Varitone switch sounds on EB3 (26 replies) thread started by barend on 09/06/2008
Value of 1962 EB3 Bass (6 replies) thread started by ebgb on 08/06/2008
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Natural finish

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