The TOD-9 takes Maxon’s classic OD-9 circuit and adds a tube gain stage at the front end to create an ultra-compact, tube-driven tone machine.
The TOD features a mil-spec 5703WB JAN Raytheon sub-miniature vacuum tube complete with its own separate Gain control (Tube knob).  This tube stage is positioned at the front of the audio path, driving the OD-9 circuit.

Review by RIG TALK

Review by sevenstring.org

TOD-9 True Tube Overdrive

The CP-9 Pro+ is that rarity of rarities – a compressor with tons of squash that does not color your guitar tone or create excessive noise.

Review by Guitar Gear

Product Page

CP9 Pro+

Maxon’s version of classic TS-9 Tube Screamer

Review by bonedo

OD-9

PAC-9 Pure Analog Chorus

Official Website