Hello guys.
I just finished one channel of the P1.7 and it's playing right now in the background.
Unfortunately i don't have enough parts to make the other channel and i have to wait next week to do that.
The voltages are ok and there is no distortion or hum.
I can barely hear a slight 50Hz with my ear by the speaker and volume at max position.
I'm not currently using an heatsink on the MOS but i placed them to share a "double-side" heatsink.
I nevertheless measured the temperature:
On the 610s the temperature is about 35C , instead on the 9110s the temp goes up to 65C (is it too much?)
As test purposes i'm using a 5 steps out volume control and a 5K potentiometer on the control gain.
The volume adjustemnt is not very nce since i don't have eough steps.
Up till now i could start the pre with a variac because if i plug it directly it would blow the power supply (really bad).
Could it be the inrush since i have on the board other 8 X 2200uf capacitor(other than the 15000uf out of board)?
I'm a little confused, since just yesterday i started it up without variac and everything worked out fine....maybe a case?
I dooon't know....any suggestion is welcome!!
i am try to compare the sound with my Electrocompaniet Preamplifier but it is not so easy since the P.7 is running with test tantalium capacitors which are well known for their distortion and a bad quality output switch.
I need to make a definite version first with both channel perfectly working and then start comparing the pre.
Anyways Up till now it seems to me that the pre sounds etter (more dinamic) wiht a 1k output resisor and the volume control on the gain.
Anybody else had experience with this regard wants to share his experience?
Last...i have noticed that the pre when conneced to the input of the amplifier lowers a lot the output voltage (almomust half)!!
Is this normal???
Can i do anything for that?
I just finished one channel of the P1.7 and it's playing right now in the background.
Unfortunately i don't have enough parts to make the other channel and i have to wait next week to do that.
The voltages are ok and there is no distortion or hum.
I can barely hear a slight 50Hz with my ear by the speaker and volume at max position.
I'm not currently using an heatsink on the MOS but i placed them to share a "double-side" heatsink.
I nevertheless measured the temperature:
On the 610s the temperature is about 35C , instead on the 9110s the temp goes up to 65C (is it too much?)
As test purposes i'm using a 5 steps out volume control and a 5K potentiometer on the control gain.
The volume adjustemnt is not very nce since i don't have eough steps.
Up till now i could start the pre with a variac because if i plug it directly it would blow the power supply (really bad).
Could it be the inrush since i have on the board other 8 X 2200uf capacitor(other than the 15000uf out of board)?
I'm a little confused, since just yesterday i started it up without variac and everything worked out fine....maybe a case?
I dooon't know....any suggestion is welcome!!
i am try to compare the sound with my Electrocompaniet Preamplifier but it is not so easy since the P.7 is running with test tantalium capacitors which are well known for their distortion and a bad quality output switch.
I need to make a definite version first with both channel perfectly working and then start comparing the pre.
Anyways Up till now it seems to me that the pre sounds etter (more dinamic) wiht a 1k output resisor and the volume control on the gain.
Anybody else had experience with this regard wants to share his experience?
Last...i have noticed that the pre when conneced to the input of the amplifier lowers a lot the output voltage (almomust half)!!
Is this normal???
Can i do anything for that?