fet matching


2001-11-24 1:24 am
i am building an aleph 5 and am beginning to match the fets. i have a 13.8 vdc power supply and am using a 10 ohm 10 watt source resistor. i start to get ~4 volts across the fet and then it increased to 13.8. i am using a heatsink for the fet but it still heats up quite a bit. i'm stumped, i used the pass fet matching scheme posted for the A-75. can anyone help? i'm sure that i'm doing something really stupid, i just don't know what.