How can I date my old electro-harmonix pedals??
The easiest way to date pedals is the same way you date some guitars and amps – by the POT CODES. EH, MXR, and most US made effects 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. You can also date speakers this way!
