Helo everybody!
Help me please
this are the readings of voltage acros source resistors in my aleph 2 shown for one chanal. I`d like to ask some one who build this amp (GRolins perhaps or anybody else) for fast check of values. I`m geting 2,6A on positiv chan. and 2,7A on output devices in total. I`m litle low but what is concerning me is not equal reading on resistors. I`d like to know if I`m in the resonable limits of recomanded values. If I`m not or even if I`m what is the way to corect it (R19 ?). Voltages acros R14(392ohm) and acros colect. and emitor of MPSA18 are normal. Voltage acros R11 (source resis. on Q3-221ohm) is a litle to high 6V (4-5 recom.). DC is 43,8 + 43,8 -. Oh, one more thing regarding source resistors. On the pos. chanal side the resistor conecting main board and fet board (source to R20) have the largest value of six fets, on the negativ chanal side there is resistor in the same position (conecting to the main bord) but with the lowest value of six uotput fets (normal?). Othervise amp is working only few ours but without any problems clean and stady. Heat sinks (2 piec. 200x300x40mm 10mm base plate, per chanal) alowing me to hold my hand on them for 5-6 seconds. Are the aleph`s phase depandent?
Values of source resist. voltages
+chanal 0,43 0,41 0,46 0,43 0,43 0,40
-chanal 0,48 0,42 0,48 0,39 0,48 0,45
R11 (221ohm by Q3) 6V
R14 (392ohm) 4,2V
colect - emit MPSA18 4,12V
I`ll aprishiate any ansver - thanks!
rgds Marjan
Help me please
this are the readings of voltage acros source resistors in my aleph 2 shown for one chanal. I`d like to ask some one who build this amp (GRolins perhaps or anybody else) for fast check of values. I`m geting 2,6A on positiv chan. and 2,7A on output devices in total. I`m litle low but what is concerning me is not equal reading on resistors. I`d like to know if I`m in the resonable limits of recomanded values. If I`m not or even if I`m what is the way to corect it (R19 ?). Voltages acros R14(392ohm) and acros colect. and emitor of MPSA18 are normal. Voltage acros R11 (source resis. on Q3-221ohm) is a litle to high 6V (4-5 recom.). DC is 43,8 + 43,8 -. Oh, one more thing regarding source resistors. On the pos. chanal side the resistor conecting main board and fet board (source to R20) have the largest value of six fets, on the negativ chanal side there is resistor in the same position (conecting to the main bord) but with the lowest value of six uotput fets (normal?). Othervise amp is working only few ours but without any problems clean and stady. Heat sinks (2 piec. 200x300x40mm 10mm base plate, per chanal) alowing me to hold my hand on them for 5-6 seconds. Are the aleph`s phase depandent?
Values of source resist. voltages
+chanal 0,43 0,41 0,46 0,43 0,43 0,40
-chanal 0,48 0,42 0,48 0,39 0,48 0,45
R11 (221ohm by Q3) 6V
R14 (392ohm) 4,2V
colect - emit MPSA18 4,12V
I`ll aprishiate any ansver - thanks!
rgds Marjan