🙄 🙄 🙄 🙄wuffwaff said:
that´s correct
william
The 0% current gain (i.e. constant current source) means that the current source delivers no current at idle…?!?!
Please save me.
JH
0% current gain is the same as a 'normal' constant current source in that it delivers the same current at all times ...
AudioFreak
Just one more question.
What could be the meaning if with the 90% current gain?
JH
Just one more question.
What could be the meaning if with the 90% current gain?
JH
jh6you said:
0% gain on the current source means constant current
from the current source at the bias level. The AC value
of this current will be 0 since it doesn't change.
Let's say you bias the current source at 1 amp. If the
current gain is 50% in an Aleph circuit, then the current
through the source will vary from 1 amp at idle to 2 A
at maximum positive output current to 0 A at maximum
negative output current.
If the gain is 0, then the current is always 1 amp
if the gain is .9, then the current is +10 A at maximum
positive and 0 at maximum negative output current.
Nelson,
I guess I have been missing the mark but I was thinking that 50% gain of 1 A would put it it at 1.5 A at max pos and .5 A at max neg.
That what I get for using the wrong tool for the job. Thinking... get it!.
I guess I have been missing the mark but I was thinking that 50% gain of 1 A would put it it at 1.5 A at max pos and .5 A at max neg.
That what I get for using the wrong tool for the job. Thinking... get it!.
Thanks, Nelson Pass.
I've got the full picture now.
Sorry for my troublesome questions, AudioFreak and William. 😉
JH
I've got the full picture now.
Sorry for my troublesome questions, AudioFreak and William. 😉
JH
Yeah!!! if the gain is 0.8, then the current is +5 A at maximum positive...Nelson Pass said:
Now it seems I am on the right track.
🙂
JH
Thanks for your kind confirmation, AudioFreak.
I am happy in having removed a headache just at the door into our 3-day lunar new year holidays. Happy New Lamb Year!!!
JH
I am happy in having removed a headache just at the door into our 3-day lunar new year holidays. Happy New Lamb Year!!!
JH
Aleph-X unbalanced?
Dear all,
I am in the difficult position upon to decide on which will be my next amp. After 3 years with my beloved aleph3 clone mated with my Tannoy HPDs, I am about to built an aleph2 or an aleph X. My target requirement is about 60W on my 6,5 ohm loudspeakers.
So, I wanted to ask if I use my aleph L clone for preamp is it better to build an aleph2 or X? To my eyes an x would be valid only if my cd player and pre was balanced. Is this a correct assumption, or an X is working equaly well with unbalanced sources as an aleph2 does? To my eyes it seems tha driving an X with unbalanced sources I only get to work half the circuit, while in an aleph2 I do not.
Any help would be greately appreciated.
Sincerely,
Panos
Dear all,
I am in the difficult position upon to decide on which will be my next amp. After 3 years with my beloved aleph3 clone mated with my Tannoy HPDs, I am about to built an aleph2 or an aleph X. My target requirement is about 60W on my 6,5 ohm loudspeakers.
So, I wanted to ask if I use my aleph L clone for preamp is it better to build an aleph2 or X? To my eyes an x would be valid only if my cd player and pre was balanced. Is this a correct assumption, or an X is working equaly well with unbalanced sources as an aleph2 does? To my eyes it seems tha driving an X with unbalanced sources I only get to work half the circuit, while in an aleph2 I do not.
Any help would be greately appreciated.
Sincerely,
Panos
Panos,
the Aleph X works well with a single ended unbal signal .
Each half of the circuit will work.
A balanced source will improve the performance but this is true for your Aleph 3 too.
After this why not try a balance line stage as a nice converter?😉
the Aleph X works well with a single ended unbal signal .
Each half of the circuit will work.
A balanced source will improve the performance but this is true for your Aleph 3 too.
After this why not try a balance line stage as a nice converter?😉
Aleph-X with j-fet input
It took some time, but I am finaly able to keep my promise.
Here is a simulated ALEPH-XJ. Enclosed are some simulation
results. I am looking forward to read any comments.
Regards.
It took some time, but I am finaly able to keep my promise.
Here is a simulated ALEPH-XJ. Enclosed are some simulation
results. I am looking forward to read any comments.
Regards.
rtirion
What is the use for R36 and R38 tied together and at the sources of the jfet diff pair?
What is the use for R36 and R38 tied together and at the sources of the jfet diff pair?
I have just recieved the Aleph x boards from hi fi zen...they look super...where in the thread is there a bill of materials and some instruction on how to hook up the boards.
Audionut,
I'll make up something tonight. You should be aware that there is a whole lot of freedom of choice considering the overall number of components. I experimented only with a limited number of variations, other people have done more tweaking and came up with very different sound impressions. Some of these tweaking include different CS, different feedback and input resistor values.
By far the most important thing is that you should get some Mills resistors from the bulk purchase thread I started, just kidding. 😉
I'll make up something tonight. You should be aware that there is a whole lot of freedom of choice considering the overall number of components. I experimented only with a limited number of variations, other people have done more tweaking and came up with very different sound impressions. Some of these tweaking include different CS, different feedback and input resistor values.
By far the most important thing is that you should get some Mills resistors from the bulk purchase thread I started, just kidding. 😉
r36 and r38 from aleph-xj
r36 and r38 are the famous Ian MacMillan resistors.
These help to control the absolute offset. This is the
offset from one output to ground. The differential offset
(offset between + and - output) is not affected by these.
Regards
r36 and r38 are the famous Ian MacMillan resistors.
These help to control the absolute offset. This is the
offset from one output to ground. The differential offset
(offset between + and - output) is not affected by these.
Regards
Idss classification V type would be better if I would be able to get
them. V type would mean little higher transconductance, and
more feedback, so little lower distortion. For this to work you
would need to bias the frontend harder (let us say 15mA per
side of the diff pair), hence this would mean at least two V(iolets)
in parallel to deal with the increased dissipation. The current
source for the frontend would need to deliver more current,
means more dissipation, so a different type would be needed as
well. I remember Mr. Dieckmann recommending a 2sj77.
Your schematic shows 2SK109G. Did you mean 2SJ109GR?
These would be the lowest Idss class.
The 1k drain resistors R23R and R25R in your schematic suggest
a bias of only 4 to 5mA. Good for GR type, not so good for V type.
them. V type would mean little higher transconductance, and
more feedback, so little lower distortion. For this to work you
would need to bias the frontend harder (let us say 15mA per
side of the diff pair), hence this would mean at least two V(iolets)
in parallel to deal with the increased dissipation. The current
source for the frontend would need to deliver more current,
means more dissipation, so a different type would be needed as
well. I remember Mr. Dieckmann recommending a 2sj77.
Your schematic shows 2SK109G. Did you mean 2SJ109GR?
These would be the lowest Idss class.
The 1k drain resistors R23R and R25R in your schematic suggest
a bias of only 4 to 5mA. Good for GR type, not so good for V type.