Silvertone 1333 original speaker was a very weak, microscopic magnet one,which every modern user rushes to replace, vastly improving the sound.
Classic 50īs speakers, used by practically everybody, were Alnico magnet Jensen, a P12Q would have been perfect.
But today they are much sought after,almost unavailable and so very expensive.
The ceramic versions are more available, or you can get the modern Jensen ones , made in Italy.
Some donīt like them, finding them too bright, but truth is they compare the new ones, fresh out of the oven, to worn tired 60 y.o. ones.
There are modern Jensen C12Q (ceramic); modern Jensen P12Q (closerto original but 3X as expensive); you can get old original Jensen ceramics on EBay and Craigslist, usually "pulls" from old organs and Radio+record player "consoles", or ask Ted Weber Speakers, they make modern reproductions with "original worn sound" 9ifn you want to, for reasonable price.
All of them are different flavours of the same American sound.
There are also American sounding modern Eminence speakers, very good but not cloning the mid powered C12Q ; rather the higher powered C12N , which might be called "the Twin Reverb speaker" , very good but a different flavour.
If anything, "too good for a Silvertone 1333".
I mean, if you want to keep real close to original sound.
Modern Jensen P12Q
Original 1964 Jensen P12Q: