Dean Markley Overlord III, Vox 830 Overdrive/booster, Marshall Blues breaker.

A Trio of favorites, the Overlord III was a steal at £17 and has a great OTT driven sound.

The Vox 830 is also out of production, and gives a more or less straight boost to drive the front of a valve amp/preamp.

Marshall Blues breaker.

This pedal produced in the early 1990’s was designed to emulate the “bluesbreaker” amp produced by Marshall.

While I couldn’t say that the result is anywhere near perfect, it does offer a gritty and useable tone through a transistor/valve amp, one to pick up if you come across it.

The other Marshall “Black box” series pedals are also quite good.