Recording with ext. out

Can I record my combo through the speaker ouput? I have no mic

no, because there won't be a speaker load, you'll kill the OT, plus the output will be too hot to record without padding down and converting to line level

Thanks man, glad I was apprehensive.

what you need for this is a DI with a 20dB pad and a speaker thru jack, then you could do it... its best if you use a loadbox or an attenuator with a load setting like a hot plate. You take the line out from the attenuator, feed the recorder with it and then treat the recorded signal with speaker cab IR. You can even make IRs of your own cabs being pushed really ahrd by a solid state power amp and then recorded by a fancy microphone you can't afford if you book an hour of cheap studio time... then put your custom IR on your computer at home to use for direct recording your amp in your bedroom later on. If you have a good load box or attenuator it should sound reasonably close to playing a live cab in a studio and you can then run your amp as hard as you want without pissing off your neighbors because you are essentially using the amp as a glorified effects processor. There's lots of great cabinet IRs available on the web and freeware VSTs to load them into. So investing in a reactive loadbox or good attenuator is a worthwhile proposition.

EDIT: you could use your effects loop as a preamp send into your recorder!