Marshall cab serial number dating
Around late 1967, the doping on the back of the cone was phased out, roughly the same time the voice coils were upgraded by 5 watts.
I am including T1281 and T1534 together here because they are basically the same speaker.
Now available as 20w heritage reissue (also re-labelled as EVH), or the standard 25w model.
Famously used by Angus Young and an important ingredient in Van Halen’s “brown sound”.Ceramic speakers (aka ‘greenbacks’) first appear around late 1964 to early 1965.They have a slightly more aggressive tone compared to the alnico magnet speakers.The familiar green covers appear very soon after this around March / April 66.The first T1217’s had a power handling of 25 watts and had welvic doping on both sides of the cone.