Currently Being ModeratedMar 6, 2012 1:36 AM (in response to rmccaw7)Re: Using Spider Valve 212 mk.II combo as a cab
Yes you could use the Spider Valve 212 combo as a cab. You might need to use an in-line female-female 1/4" adapter to enable the speaker cable from the Spider to be extended so that you can plug it in to the Marshall. Just check the impedance of the Celestion speakers in the Spider Valve combo and which output socket they are plugged into on the Spider Valve amp so that you plug them into the correct impedance output on the Marshall.
Obviously, you would not need to power the Spider Valve and you will need to completely disconnect the speakers from the SV amplifier. Don't attempt to do what a few users have done (to their extreme regret) and plug the Marshall's output straight in to any socket on the SV as you will kill the SV's output transformer and possibly damage the Marshall as well. You only need the speakers to be directly connected to your Marshall!