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It really depends - luckily both my amps are 16ohm and the once I'm planning to build has a 4/8/16 switchable output transformer, but it's hard to assume. My AC30 has 2x12" Celestions but is 16 so always worth checking the amp's external out (or internal in some cases as there could be a jack linking the internal speakers in combos) but the back of the amp will always tell you what you need.
On the topic of the Broadcast - I've used the single switch one a couple times and loved it! Got a PCB for one in a drawer that I need to get populating at some point...
alex_s
They do an 8 ohm and 16 ohm version. I'm assuming a 2x12 Celestion valve combo would be 8 ohm?