BOSS SD-1 SUPER Over Drive (JAPAN/NEC C4558C)

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This is a 1983 BOSS SD-1 featuring a NEC C4558C op-amp!

It features the asymmetric overdrive circuit inherited from the OD-1 and is equipped with a new tone control that allows for high-frequency boost or cut. Thanks to subtle circuit modifications, it offers a slightly higher gain and a more solid tone compared to the OD-1. It produces a sweet, mild distortion without dampening the subtle nuances of your picking.Although it uses the NEC C4558C op-amp found in the very earliest models, this is a relatively rare unit with a 6-digit stamped serial number and a Taiwan-made circuit board. Other variants include the JRC4558D, which was used around 1982, and the JRC4558DD, which was subsequently installed in most SD-1s. Additionally, this unit’s control knobs are screw-mounted, and the pots feature solid shafts.The SD-1 was manufactured in Japan until around the middle of 1989, after which production was moved to Taiwan.

Circuit Board: ET5212-510B (Taiwan-made board)
OP-IC: NEC C4558C (#M1796E)
ACA adapter compatible

* Battery snap replaced; slight traces of battery fluid leakage in the battery compartment

Year: 1983

Accessories: None

Handled by: Sano

*The warranty period is one month from the date of purchase.

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