How do i set my ohms for a 5150/marshall 1960 lead cab

[ColinBecker]

I have had both for several years. I want to make sure I am running it correctly
What do i run the ohm out of the amp and what do I set the back of the cab?

Thanks

[loudthud]

1960 cabinets have changed over the years. Does yours have the 4 or 16 ohms switch or like a mono-stereo switch? I'd set the cab and amp on 4 ohms unless you want to run more cabinets.