The Master must be building F2's during a coffee break...
Since we started "assuming" how F2 is made, then let's move further...
For example, I assume that F2 uses lower supply voltage (between 25-30 v) and a higher bias (3 A perhaps?). It is yet unclear whether it uses a buffer or nor, but I have some indications that is built without a buffer, one mosfet only. Now, it makes me think which device Nelson employed :IRFP044. Or maybe something else, like 2SK1529??
Am I wrong?
Regards,
Vix
Since we started "assuming" how F2 is made, then let's move further...
For example, I assume that F2 uses lower supply voltage (between 25-30 v) and a higher bias (3 A perhaps?). It is yet unclear whether it uses a buffer or nor, but I have some indications that is built without a buffer, one mosfet only. Now, it makes me think which device Nelson employed :IRFP044. Or maybe something else, like 2SK1529??
Am I wrong?
Regards,
Vix
Vix said:For example, I assume that F2 uses lower supply voltage (between 25-30 v) and a higher bias (3 A perhaps?). It is yet unclear whether it uses a buffer or nor, but I have some indications that is built without a buffer, one mosfet only. Now, it makes me think which device Nelson employed :IRFP044. Or maybe something else, like 2SK1529??
24V
2.7A
no buffer
IRFP240 (gain) / IRFP9240 (ccs)
5 watts into 8 ohm
15.5 dB gain
-1 dB @ 100 KHz
20 uV noise
Hi Nelson
I am currently driving with a modified balanced v7 with ccs, 30V, 2.8amp per side, input caps of 10uf. I am using 3 pair of CCS per side. All the mosfet used were 044N. Got myself the 9140 few months back, intend to change the two CCS each side. But never got the time.
Even as it is, comparied to zenlite (unbalanced), this amp sound as good. But different in presentation
Can you please kindly comment on using p-channel for the CCS?
Would love to try these P-channel CCS and the no-feed back thingy.
Hock Hua
I am currently driving with a modified balanced v7 with ccs, 30V, 2.8amp per side, input caps of 10uf. I am using 3 pair of CCS per side. All the mosfet used were 044N. Got myself the 9140 few months back, intend to change the two CCS each side. But never got the time.
Even as it is, comparied to zenlite (unbalanced), this amp sound as good. But different in presentation
Can you please kindly comment on using p-channel for the CCS?
Would love to try these P-channel CCS and the no-feed back thingy.
Hock Hua
Hi!
Nelson is being really generous
With all these numbers provided, we can safely start assembling...
It's a bit weird that IRFP9240 was used, but hey, that's just CCS, so it shouldn't matter whether we use it or IRFP240 (or a lightbulb, if you wish). And no, I assume there's no Aleph CCS...
It seems that Nelson's goal was to show us how marevelous the original Zen was, and how little is needed to make another marvelous amp. Keep it simple....
I can't stop making questions. Since there's no buffer,what is puzzling me now is the input impedance of that circuit. So, Nelson, what value of the input resistor do you use?
(referring to R5 4,75 Kohm in the original Zen)
Thanks,
Vix
Nelson is being really generous
With all these numbers provided, we can safely start assembling...
It's a bit weird that IRFP9240 was used, but hey, that's just CCS, so it shouldn't matter whether we use it or IRFP240 (or a lightbulb, if you wish). And no, I assume there's no Aleph CCS...
It seems that Nelson's goal was to show us how marevelous the original Zen was, and how little is needed to make another marvelous amp. Keep it simple....
I can't stop making questions. Since there's no buffer,what is puzzling me now is the input impedance of that circuit. So, Nelson, what value of the input resistor do you use?
(referring to R5 4,75 Kohm in the original Zen)
Thanks,
Vix
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