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How Do You Date An Old MXR Distortion + ?

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No, not that sort of date! :love:

My friends got a mustard coloured Distortion + with a block logo and he thinks its late 1970's but he's not sure. Is there any way of finding out exactly when it was made (like by any serial numbers, etc)? Thanks......

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from the Analogman site


MXR used pots with EIA date codes on them. They usually start with 137 which is the manufacturer (137 = CTS), then the next digits are the year and week. For example, 137 7903 would be a CTS pot, made in the 3rd week of 1979. Sometimes there are only 6 digits, for example 304731 would be 304 (stackpole) 7=1947 or 1957, 31st week.


Other manufacturer codes are :

106 : Allen Bradley

134 : Centralab

137 : CTS

140 : Clarostat

220 : Jensen (speakers)

304 : Stackpole

328 : Utah/Oxford speakers

381 : Bourns

465 : Oxford speakers

285 : Rola

391 : Altec-Lansing

649 : Electro-voice

1098 : Pyle

67 : Eminence

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OK, the pedal is an early block logo with LED but the circuit board is covered with foam and I can't see the pots. There is a serial number where the battery goes and its 4-151304. Does anybody know what year this number relates to, maybe 1984?........

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