after building few single stager i think its about time moving to dual stager ....
my E6600 hunger for more colder temps, 5ghz on single stager was achieved, next gonna try it to make it stable on 5ghz and trying suicide clock >5ghz....

details

1st stage:
3/4hp Matsu$hita R22 Rotary Compressor
some desuperheater
condensor 1 row 20x25cm + fan
filter/drier
captube arround 2.15m 0.031"
Heat Exchanger
Dupont R22 refrigerant

2nd stage:
1/3hp Kulthorn R12 Compressor
coil desuperheater 4m
Danfoss KP-5 cut-off switch
Pressure Relief Valve (hard to find it here)
Alco Oil Separator
filter/drier
captube arround 2.3m 0.031"
My Evaporator and flex suction line
Dupont R22 and CO2

the design:




the Heat Exchanger (HX) = 4m 1/2" pipe, inside = 3x3/16" pipe