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The Pete Townsend pedal.

Here you go. A holy grail, silver screw, long dash Boss OD-1. It's battered and bruised like a hard working overdrive should be but all good where it counts. This is an early 1980 model (serial 9200) with the 8 pin 4558D JRC chip. I know there are many on Reverb more knowledgeable than I so any info is welcome.

Here's what Analog Man has to say about these legends...

The Boss OD-1 was about the first OVERDRIVE pedal made, except perhaps the Ibanez Overdrives. But the early Ibanez pre-tube screamer OVERDRIVES were quite fuzzy and distorted, while the OD-1 is the first of the "tube screamer type" overdrive pedals. It was in the very first series of the Boss Compact Effectors. The OD-1 came out in 1977 and was discontinued in 1985. They were very popular in the LA metal scene in the mid 80s and the Japanese scene in the same time and much longer. The SD-1 took over from the OD-1 in the mid 80s but people still wanted that pure OD-1 sound. The OD-1 (and SD-1) use asymmetrical clipping, which Boss has a patent on, to give some thick overdrive with an edge. Tube Screamers use symmetrical clipping for a smoother, warmer, less edgy sound.

The original OD-1 was made with a QUAD OP AMP CHIP. This RC3403D chip has 14 pins. Some early ones (1978) used an NEC uPC4741C quad op amp instead. Later versions used a dual op amp, with 8 pins. Usually a 4558 chip was used, and often the famous JRC4558D

but the sound of the later unit with the smaller chip was NOT the same as the original version. The oldest versions will have a metal thumbscrew and ink-stamped serial number in the battery compartment. But some with the small chip have those features, too (1980). So the only way to tell if you have the GOOD ONE is to look inside for the chip and see if it is the small one (8 legs) or the big one (14 legs).

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