This replaced David's Coloursound Powerboost overdrive around the 80's. Two of these are part of his Momentary and Division bell setup in 1993 and 1994, and are still used in his solo shows. (The source lists these as Chandler Tube Drivers.) Photo of David Gilmour's pedalboard with both Tube Drivers: http://www.kitrae.net/music/Division%20Bell%20pedals_enhanced.jpgmore
This was a hand me down from my dad (Also a guitarist). He had one of the super old ones (black shell, yellow lettering) and when he bought the new one he gave me that one. I love it for solos, it gives you that extra bit of creamy boost for leads. Excellent pedal if you've got the money.
I love these but for Me now days, it just doesn't justify having a $300.00 Tube Driver. I'm using a Boss Blues Driver running it into a Digitech Compressor into a Electric Mistress Flanger. I get almost the same Colorsound of Gilmour's 70's work. Not to mention a lot of My Own. After all, The Guitarist I really want to sound like is Pepper Roberts. ( Me )