First swap speaker cables to determine if it is the speaker or the electronics. very easy unless your speaker cables are exact length.
Figure out what the problem is before you try to fix it.
Loud pop right speaker, no right channel sound
All amp tubes still have light in them. No sound from right speaker. Could it be right channel fuse in the amp even though all tubes are lit? Or, is there a fuse in the speaker? Meadow Lark Osprey Gen 2. They’re old but great. I’ve had amp fuses pop before but the associated amp tubes would be dark.
==> Is there a fuse in the speaker? Huh? Oh did something else blow in the speaker?