stevem Messages: 4733 Registered: June 2004 Location: NY
Senior Member
If the cabinet still has its original plastic speaker jack plate on the lower rear panel it should be inscribed with CTS if it's a Bass cabinet , or Jensen if if was a guitar cabinet. But the fact that you see a 137 stamping makes them Bass drivers.
The Bass drivers have square magnets and guitar drivers would be round .
The CTS bass speakers will work for guitar but likely sound a little dull!
Wattage wise to be on the safe side of things I would not input anything more then 65 watts into the cabinet if it has the Bass drivers, and 55 watts if they are the guitar drivers.