BOSS OD-1 Overdrive (Silver Screw/Japan/NEC μPC4741C/#8400)

This is the OD-1 featuring the NEC μPC4741C quad op-amp, which succeeded the original Raytheon 3403!

The early OD-1 circuit featured a quad op-amp (a module combining four op-amps). These included the RC3403ADB used in the very earliest models and the NEC μPC4741C used in units from lot #8400 to around #8800. The LED indicator was dedicated solely to the battery checker.Starting around No. 8900, the specification was changed to a dual op-amp (a module combining two op-amps), and at the same time, the LED indicator began to show ON/OFF status. This unit is from around the late 1970s, when the op-amp was changed from the imported Raytheon RC3403—which was said to have some issues with quality consistency—to the domestically produced NEC μPC4741C.Even among units equipped with quad op-amps, the sound difference between the RC3403ADB and the μPC4741C is so significant that they hardly seem like the same model. Compared to units equipped with the RC3403ADB, those with the μPC4741C have a richer low-mid range, more subdued highs, and a fatter sound. This is unit No. 8400.

PCB: 052-281B
OP-IC: NEC-JAPAN μPC4741C (#K94025-916)

External spring-loaded transparent switch

The LED lamp is not for ON/OFF but is dedicated to the battery checker
Compatible with ACA adapters
MADE IN JAPAN

*Rubber bushings for coin-head screws have been replaced

Year: 1979

Accessories: None

Contact: Sano

*The warranty periodis one month from the date of purchase.

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