Boss OD-1 Overdrive 1986 Japan s/n 653700 with JRC4558DD op amp in very good condition.
Thoroughly tested and in perfect working order.

The OD-1 is by now legendary. Artist of the 70's was mostly using a fuzz distortion sound and the overdrive produced by the OD-1 was not typical. It was however soon accepted as the new standard of guitar sound. The OD-1 features an asymmetric circuit where the positive and negative halves of the waveform isn't distorted equally. The sound is therefore still close to the original even though distortion have been added.

Version differences 
The OD-1 has gone through a number of changes since its conseption. The different versions have been named OD-1A, OD-1B and so on. The version letter is printed on the PCB in the form of the number 052-281A to 052-281E. There are at least 4 different versions available. Each with minor differences like opamps from different manufacturers. The 4 digit serial number is ink stamped inside the battery compartment. These numbers are not real serial numbers but instead batch numbers. It is so far unknown how many pedals there were in a batch. The section below lists the major differences between different versions of the OD-1.

• • OD-1A

• • Serial: 6400 - 6500

• • Marking of PCB: 052-281a

• • Switch: Transparent

• • Silver screw

• • OP-AMP: RC3403ADB

• • OD-1B

• • Serial 6600-8800

• • Marking of PCB: 052-281b

• • Switch: Up to 8400 transparency, from 8600 black

• • Silver screw

• • OP-AMP: Up to 8400 RC3403ADB, from 8600 uPC4741C (NEC)

• • OD-1D

• • Serial 8900- , 6 digit sticker

• • Marking of PCB: 052-281d

• • Switch: Black

• • Screw: 8900-0300, silver screw, 0500- black screw

• • OP-AMP: 9900 - NJM4558D (JRC)

• • 9300,0300 - uPC4558C (NEC)

• • 0000 TL4558P (Texas Instruments)

• • OD-1E

• • Serial: 6 digit sticker

• • Marking of PCB: 052-281e

• • Switch: Black

• • Black screw

• • OP-AMPs: uPC4558C (NEC)

• • JRC4558D (JRC)

• • JRC4558DD (JRC)

• • JRC4558DX (JRC)

• • C4558C (NEC)

Specifications

• Controls: Level, Overdrive
• Connectors: Input, Output, AC Adaptor
• Current Draw: 3.5 mA (DC 9V)
• Weight: 400g.
• Input Impedance: 220kOhm
• Output Impedance: Over 600Ohm
• Signal/Noise Ratio: 80dB
• Recommended AC Adaptor: ACA Series

Labels

• Black - Made In Japan

The OD-1 was sold from November 1977 to July 1988.