Dating potentiometers

Information concerning which year a certain model was introduced, or when configurations where changed, varies a lot.

It seems quite clear however that the 125/126 was first introduced in 1954 and that their Club equivalents where born in 1957/58, when Selmer became the Hofner agent in the UK.

The Russian made Big Muff pots also lack date codes.

dating potentiometers-45

When it comes to the 127/128/Club60, information is more ambiguous.

Year of introduction varies between 1954-1961, depending on source of information.

Russian made Big Muffs have Russian made pots, usually 100k linear taper. If you replace an old pot with a new one of the same size, it is sometimes hard to find pots with the same pot shafts that fit the old knobs.

You can use 100k audio log taper for the volume pot. You can sometimes pull the shafts out of the old pots and install them in the new ones.

Electro-Harmonix used pots from various makers, but they were usually the 24mm size, with 1/4" knob posts.

Logarithmic taper pots, or audio pots, will also work for the volume pot and sound better, but they are more expensive than linear.Loosen the two screws holding the controlplate, turn it upside down and you will find some numbers.250K is the impedance of the potentiometer, but it is the number to the right you should take a closer look at.So a pot stamped 1377833 is a CTS pot made in the 33rd week of 1978.Note that this does not mean a Muff with a 1978 pot was actually made in 1978, it just means it was not made much earlier than 1978.In the second string of numbers, the first three numbers are a code identifying the manufacturer.

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