[HAM] How do I get overdrive on an L-100 spinet?

[DougJ1986 at aol.com]

How do I get overdrive like Deep Purple etc on an L-100 spinet?  FYI  - I 
have been using the internal speaker , although I do have a model 110 Leslie  but 
I have not connected it since I am unsure about dummy loads etc - also, I do  
have several overdrive pedals for guitar....]

Thanks 
Doug Out