| This is very confusing. You have a combo and you want to use a tube head with the cab that's inside the combo? seems redundant to me. Why not get a tube head and then sell or trade the combo for a cabinet (seems silly to carry around an extra head that you aren't using).
Or did you mean you wanted to remove the integrated amp and put a tube amp in? because that's even less likely to happen.
But beyond all that, I don't think you understand amp watt ratings at all. Why do you think it needs to be under 140? especially since you say you don't know what the speaker is rated for.
Tell us EXACTLY what you have (pics would be great) and what you want to have. and maybe we'll be able to help you.
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