Including an L-pad attenuator into a 5F1 build

Greetings, Friends. I've built a Champ clone or 2, sticking close to the original 5F1 or 5F2A schematics, and I want to access the sweet, OD tones without all of the ear-bleeding.

I see PartsExpress has a range of L-Pad Attenuators from 100 watt down to this little 15w beauty