Here is my new preamp. It is modification of Aleph P 1.7. I would like to use power supply from my BLSOSOZ, eliminate input capacitors, use CC sources as in Aleph P and use 40mA bias as in BLSOSOZ. Please send me your suggestions.
Sorry for my bad english.
Sorry for my bad english.
You could try replaceing the active drain loads on the differentials with a cascode. Might make a good experiment to see which sounds better sonically.
Jam
Jam
Is it just the schematic you've done or you checked your P1.7 working with the modifications? I was wondering what sonic difference removal of feedback resistor makes? But if nobody's gonna answer that question I will check it myself because I'm halfway through with my Aleph preamp. And who said that the footprint is quite big?
Attachments
Peter,
Sorry! Are you talking about the resistors hooked from the drains of the differential to ground?
Jam
Sorry! Are you talking about the resistors hooked from the drains of the differential to ground?
Jam
No jam, you OK.
I was just curious if the resistor from drains to input have any sonic effect? Because if not, I wouldn't place in a circuit. As you see I don't have too much space available.😉
I was just curious if the resistor from drains to input have any sonic effect? Because if not, I wouldn't place in a circuit. As you see I don't have too much space available.😉
I see you were refering to a different thread, the resistor might supply a little feedback but it's main purpose is to bias the mosfet on. I don't think the circuit will work without that resistor.
Jam
Jam
HPotter,
no it's only schematic, I'm working on prototype now.
jam,
this circuit should work, gate of gain FET is at zero potential and source at -4V as in BLoSOZ, because I use +60V/-60V power supply. So I can omit bias resistor and input capacitor.
no it's only schematic, I'm working on prototype now.
jam,
this circuit should work, gate of gain FET is at zero potential and source at -4V as in BLoSOZ, because I use +60V/-60V power supply. So I can omit bias resistor and input capacitor.
Brunner,
I ment the original Aleph 1.7 that used a single ended supply. Your circuit should work fine.
Jam
I ment the original Aleph 1.7 that used a single ended supply. Your circuit should work fine.
Jam
Preamp
Brunner,
I do not see any input capacitors. Did you mean output capacitors? Is there any serious reason to remove them?
Regards,
PMA
(your reply in czech would be appreciated, too 🙂)
Brunner,
I do not see any input capacitors. Did you mean output capacitors? Is there any serious reason to remove them?
Regards,
PMA
(your reply in czech would be appreciated, too 🙂)
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