Cts potentiometer dating
This means that the Pot was manufactured by CTS company in the 15th week of 1974.
If your earlier detective work determined that the guitar was probably made in the early 70’s, you can now ascertain that since you always date an instrument by the latest dated part, that it’s most likely from 1974.
This is information from the Engineering and Publications department.
In addition to a source code, it may be desired to identify the date of production.
The Muff could have been made months or even years after the pots were purchased as it is known that Electro-Harmonix bought the pots in bulk, as did Fender, and other companies at the time.
Stackpole and CTS made the pots in large runs also, so they may have shipped pots dated earlier than the year Electro-Harmonix ordered them. Some Triangle Muff pot codes are dated 1966, two years earlier than the founding of Electro-Harmonix!
Six digits were changed to seven starting in the 1960’s making the year two digits instead of only one.This means that if you don’t have a basic ballpark of the period an instrument was made prior to the 1960’s then Pot codes won’t really help you.For example, the Pot codes you can make out are: 1377415.They now make polyester film capacitors) 106 – Allen-Bradley Corp.(Make potentiometers and from El Paso, Texas) 117- Credence Speakers, Inc (Kevil, Kentucky) 124- Alpha Wire Corp. You can find old spools of wire and see codes and dates on the reels) 134- Mepco/Centra Lab, Inc. Philips Corp.) 137- CTS Corporation (made amplifier and instrument potentiometers and are based in Elkhart, Indiana) 140- Clarostat Mfg. (made pots for early Fenders and had code stamped in blue ink) 145- Illinoise Capacitor, Inc.
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Here is an "MXR" envelope filter I got in for some mods.