Converting a combo to cab

[sellisnba]

Hi all
I was looking to upgrade my amp soon and was hoping to go for a head and cab rather than a combo. My existing amp is a perfect ten 30w combo. Would it be possible to convert this into a cab? Reason being, it may be a while before before i can afford to buy a bigger cab but i would like to upgrade my amp as soon as possible.
With the combo being a 30w does this mean i can not overload the 10" speaker with say a 100w head?
Sorry for the daft questions. In my mind it seems like it would be straightforward (ie just adding a jack (via wires) to the speaker and removing the amp wires) The cab won't be used for gigging only practise.
I would like to keep the amp part of the combo installed in case i wish to sell it in the future. Any help is appreciated.
Cheers.

[6v6]

Yes this will work fine, provided the speaker impedance matches the requirements of your new amp.

As you note you'll need to be a bit careful if the new amp is a lot more powerful than the amp in the combo or you'll blow the speaker.