Great, thanks for the feedback. Celestions seem to be more associated with British amps including Vox so it seems a good option. They're readily available too. The 10" Greenback is promoted as sounding like a 12" which I think might be good. So I was on the money with Jensens!

Any opinions on Webers or other brands?

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Lots of pedals and guitars, limited ability, and little time.