Just to let y'all know that I successfully built one channel of "What" compression while on holiday last week. The 200 year old cottage, fully modernised, had a table in the kitchen by the window which got sunlight until 9.30 each night, so great light conditions for soldering as the weather was fantastic. Having grabbed a load of components at the last minute, I was only stuck for the PNP transistor. Luckily I found a 2n5087 and guessed the pinout - well, there's only so many combinations! It worked first time - not bad for veroboard.