Anyone know anything about a Mains or 8 - 16 Ohm switch on my vintage Orange OR-80?

[Notyour Beezwax]

I have an early 70's Orange OR-80 combo amp that sounds like pure rock fury. The only problem is that I can't use it much because of volume issues. Here's my question, it's got a 8-16 Ohm switch on the back that I keep on 8 and a switch that says 'Mains" with settings for 100 110 200 220 that I keep on 100.

I've had issues with this amp in the past and it works now so I never touch the switches. Does anyone know what they do, or how it would affect the amp if I changed the settings?

Thanks

 

[Filip Tomiša]

I think the mains switch is voltage settings because different countries have different voltage standards so i guess you should set it on the one that works for your country.

 

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[Notyour Beezwax]

USA power voltage is 120v, so I’d keep it on 110 (if you’re in America) because that’s closest and power fluctuates. The 200 and 220 are for European countries.

The ohm setting depends on the cab you’re running it through and how the speakers are wired

Thanks for the response, its a 2x12 combo, not sure how the speakers are wired though or the wattage of the speakers.

 

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[Notyour Beezwax]

I just looked it up, and if it’s the speakers the came in it from the factory, it should be set to 16. The Ohm rating and wattage should be on the back of the speakers

Thanks, Ill look at the speakers and make the appropriate adjustments.