You did very well!tele4tone said:... So......$180 was a good deal? haha ... The speaker seems strong, but I wonder where I can get a new one for a back up. When the original goes I will need time to get it reconed.
I was looking around for some information on your speaker and found This thread over on the Gear Page. I was a little quick to ID your speaker as a field coil. In addition to the Jensen mfr ID code 220XXX, is there another code on the rim of the speaker; for example P12R or P12Q? If you have only 3 wires leading to the transformer and two wires going to the speaker, then you don't have a field coil speaker; that's the output transformer that's mounted on the frame. How many wires to you have in/out?
Older speaker frames commonly had flanges with drilled holes allowing for the OT to be mounted on the frame; I don't think any newer ones do. If/when you want to mess with a spare or replacement speaker, you are going to have to deal with that OT. Not too long after your amp was made, Gibson went to mounting the OT on the chassis. If you want to use a newer speaker, I think you're going to want to look into having the OT moved to the chassis - not really a big deal ... just some drilling, bolting, and shortening of the transformer leads.
If you have a standard OT on the speaker frame and get it moved, you can do whatever you want in the way of speakers. In their day, those Alnico 5 speakers were at the top of the speaker food chain.