I was just wondering... It is possible to make a tube preamp work with a combo tube amp ?

I would like to do that to my single channel amp in order to give it more versatility... Would it be better than buying pedals though ?

If your amp has an effects loop, you could kind've use it as a separate channel, by switching between the amp's preamp and the outboard preamp with a A/B box.

You can't put a preamp in front of a guitar amp though, the preamp can't take a line-level signal.
So if the amp has an FX loop, i can actually do it ?
Is it bad for some electronic components or something ?