#1
I am an electrical technician so you don't have to worry about talking over my head, but I don't know too much about sound stuff. I work with large motors and controllers and generation plants and distribution centers. Audio isn't within my realm of reality, but if someone can give me a heads up here, I would appreciate it.

I have a guitar amp that is powered by two 6550 power tubes (meaning that it is about 60 watts max output) and the amp chassis itself says 120 watts rms at 4 Ω. It is a combo amp with two 12" speakers with no marking on them whatsoever. I have to assume that they are 60 watt speakers. I just put my dmm on the speakers and they are indeed 4 Ω. The amp is 40 years old. I think that 40 years ago, 4 Ω must have been more common than it is now, because all I can find in the 60 watt range is 8 or 16 Ω.

What will happen if I respeaker this thing with 16 Ω or 8 Ω speakers? Will the amp not be as loud (less load on the output side?) Or will it not drive the speakers?

Can anyone help me out here?
#2
if you respeaker the thing with 2 8ohm speakers in parallel, you'll get 4 ohms
#3
Won't drive the speakers as loudly. It can also stress the output transformer in more extreme cases.
I'm not very active here on UG currently.
I'm a retired Supermod off to the greener pastures of the real world.