Chicago Telephone Supply (CTS) originally built drivers for telephone network signaling and tone generation. By the late 1950s they expanded into loudspeakers, supplying the booming tube-amp market.
Their speakers, often marked with the EIA code "137," were used extensively by Fender, Ampeg, and many other amplifier companies from the 1950s through the 1970s.
Early CTS speakers used alnico magnets (square-back frames) prized for smooth breakup, while later ceramic-magnet versions (round frames) offered tighter lows at the expense of some warmth, but this is of curse a little subjective and varies with a lot of other factors.
Old CTS speakers do pop-up on eBay and Marketplace in Australia, and it can be hard knowing what you're looking at - are they hi-fi or guitar speakers? The advertisement below might help.
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