I had two cabins SERIES JCM800 Lead 1960, mounted with the Celestion G12-65 Rola, for years, with 2203 heads. It's not a bad guy, just between the G12M Greenback and G12T75. has more rings than Brilland G12T75, but slightly less than the G12M ractifs (normal). Much like G12T75 it becomes profitable and generous in amount in the towers. He t cr by Celestion Greenback as more powerful. Forget 20Watt amps. He needs a good 100 watts when it is mounted in 4x12.
If you find 50euros price argus announced here at the rdaction of my comment, why not?
I would prfre of the G12M 25WATT, but also because I do not play me like a patient to vibrate the eardrums. The 747 landing in a pice of 15m, cest not my thing. However, to have had the pleasure of my trainer cabins on lpoque scnes grandesapte enough! .. So, you see.