as long as you don't overload the speaker, you should be fine. check the back of the speaker for its power-handeling wattage.

-Bennis

In some combo's (I'm not sure about your marshall) there is a 1/4" jack that plugs into the amplifier section. If this is the case, you can just plug it into the new head, just select the impedance properly. If not, you can wire it up yourself as per the correct impedance. If my memory serves me right, the G 12 is a 100w 8 ohm speaker. If you have two, you can wire it to achieve either a 16 ohm load, or a 4 ohm load.
If you want a more vintage sound, and your new head is selectable go fo 16 ohms. IF you want more modern sound go for four.

thanks guys-

my speakers look as if they're wired up to the components in the inside/top, not connected by a jack. (its at the shop now)
So, will I somehow create a makeshift box of some kind? with jacks on it- to access only the speakers with the new head?

thanks

I am a little confused. If you have to part with your combo, are the speakers not going with it? Are you just getting rid of the amp section?

It sounds to me like you are just gettin a new head. I ask because if you were to keep the combo cab and speakers, i would just add a 1/4" jack so I could plug it into my new head.

Originally posted by Steve Metcalf:
I am a little confused. If you have to part with your combo, are the speakers not going with it? Are you just getting rid of the amp section?

It sounds to me like you are just gettin a new head. I ask because if you were to keep the combo cab and speakers, i would just add a 1/4" jack so I could plug it into my new head.

Yes, sorry for the lack of clarity there...

Yes, 50/50 chance I'm going to get a new head and just use the speakers intact inside the old combo, leaving the old amp part just sitting dead there in the cabinet.

I can't remember how the speakers were hooked up to the amp section, I never had to think about it before and never noticed (wish I had). I'll know the shop's diagnosis by Tuesday and I'll know whether I'll get it all fixed, or have to get a new head. Unless of course I can learn how to fix it myself if its simple, but otherwise too expensive to pay the shop to do. I would love to get a new piece o'gear but its not a good time now.

Thanks

Thanks for the clarification. I would just tell you that if the amp is unfixable, you can use your cabinet. Hope that's not the case. :c:

Joy & celebration here!!!
... my amp is repairable and it'll be ready in 2 days ! It was 6-7 bad solders and alot of crud and mess in that amp section. The shop said "looks like a crappy mod" and I told them I never had it modded- they said it must have been modded at the factory and that was bad... This is such a relief, saving me $400-500+ and alot of time and uncertainty about what new amp to get, how to hook up a head to my old cabinet.. Doesn't matter ! I'll have my own sound back

thanks for your help