I see the service manual of the pass aleph L preamp and I think there are errors.
If anybody have the real schematic, Iwill be happy to see it.
Thanks...
If anybody have the real schematic, Iwill be happy to see it.
Thanks...
think there are errors
Perhaps if you listed the errors someone could help. I believe this is the "official" schematic.
H.H.
Perhaps if you listed the errors someone could help. I believe this is the "official" schematic.
H.H.
nope!
Well I already have built the aleph-L (the second version) and I do not think there is a mistake as it works perfectly for me. Only mistake I found is the values of the various test points in volts which are essentially the values of the first version.
If u think there is a mistake though i would be glad to hear from u.
Regards,
Panos
Well I already have built the aleph-L (the second version) and I do not think there is a mistake as it works perfectly for me. Only mistake I found is the values of the various test points in volts which are essentially the values of the first version.
If u think there is a mistake though i would be glad to hear from u.
Regards,
Panos
preamp aleph L
In the schematic of the service manual, the intput impedance is near to 1 or 2 KOhm only.
More, if the volume selector is on the RV6 value, when the relay is
on, the outstage of the input is short-circuiting.
I speak about version 1.2.
If anyboby want to show the problem on the schematic, give me your @mail adress.
In the schematic of the service manual, the intput impedance is near to 1 or 2 KOhm only.
More, if the volume selector is on the RV6 value, when the relay is
on, the outstage of the input is short-circuiting.
I speak about version 1.2.
If anyboby want to show the problem on the schematic, give me your @mail adress.
L-aleph
Dear SDF,
Let me try to explain things a bit for u.
first of all lets clear the relay part which is there just to mute any poping sound when u first turn on the preamp. Meaning that the relay is shortcircuiting the input to ground only for a few seconds after turn on and emmediately again when u turn off the preamp.
About the volume control is a very smart setup since until vr6 it only controls the volume directly from the input to output without using the active circuitry, working as a passive preamp, after vr6 the preamp becomes an active peamplifier.
The preamp works very well and I have it working for a years or so but without this volume control, i use the electronic volume control from aleph p. If u like to built it I can post also the pcb I am using designed by muself, not that R115 and R106 should be 2W resistors.
Moreover since I am coming to Paris in 2 weeks I would very thankfull if u could provide me with some info concerning any shops selling quality audio components as resistors from vishay-holco, capacitors etc and if u know of any shop selling used equipment for testing as, osciloscopes signal generators etc
Regards,
Panos
Dear SDF,
Let me try to explain things a bit for u.
first of all lets clear the relay part which is there just to mute any poping sound when u first turn on the preamp. Meaning that the relay is shortcircuiting the input to ground only for a few seconds after turn on and emmediately again when u turn off the preamp.
About the volume control is a very smart setup since until vr6 it only controls the volume directly from the input to output without using the active circuitry, working as a passive preamp, after vr6 the preamp becomes an active peamplifier.
The preamp works very well and I have it working for a years or so but without this volume control, i use the electronic volume control from aleph p. If u like to built it I can post also the pcb I am using designed by muself, not that R115 and R106 should be 2W resistors.
Moreover since I am coming to Paris in 2 weeks I would very thankfull if u could provide me with some info concerning any shops selling quality audio components as resistors from vishay-holco, capacitors etc and if u know of any shop selling used equipment for testing as, osciloscopes signal generators etc
Regards,
Panos
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