I started the following thread that really went nowhere:
Scaling Aleph-X up to 200w
What I did conclude though was that "for all intents and purposes" a 200w Aleph-X is the equivalent of an Aleph 1.2 for the purposes of power supplies and heatsinks. I don't see the need to complicate things more than that.
Comments anyone?
Regards,
Dan
Scaling Aleph-X up to 200w
What I did conclude though was that "for all intents and purposes" a 200w Aleph-X is the equivalent of an Aleph 1.2 for the purposes of power supplies and heatsinks. I don't see the need to complicate things more than that.
Comments anyone?
Regards,
Dan
It will generally have 1/2 the rail voltages, and twice the
current draw, otherwise the amount of hardware tends
to be about the same. The XA200 also has twice as much
capacitance, in an RCLC filter set.
And of course, a blue light on the meter. 😎
current draw, otherwise the amount of hardware tends
to be about the same. The XA200 also has twice as much
capacitance, in an RCLC filter set.
And of course, a blue light on the meter. 😎
Following Nelson's previous 'advice' I'm assuming that'll whether it's an Aleph 1.2 or a 200W Aleph-X. The beg, borrow, and or otherwise apply as much heatsink as you can find rule will apply!
The lower rail voltages may make it easier to find large doses of capacitance 'lying around'. I still have 28 of the 68,000uf Stubby's leftover from my Aleph 5 project. As soon as I complete my Aleph ala Kristijan's board and power supply design I'll see how the CLC works and go from there.
Regards,
Dan
P.S. Thanks for the input Nelson.
The lower rail voltages may make it easier to find large doses of capacitance 'lying around'. I still have 28 of the 68,000uf Stubby's leftover from my Aleph 5 project. As soon as I complete my Aleph ala Kristijan's board and power supply design I'll see how the CLC works and go from there.
Regards,
Dan
P.S. Thanks for the input Nelson.
Following Nelson's previous 'advice' I'm assuming that'll whether it's an Aleph 1.2 or a 200W Aleph-X. The beg, borrow, and or otherwise apply as much heatsink as you can find rule will apply!
The lower rail voltages may make it easier to find large doses of capacitance 'lying around'. I still have 28 of the 68,000uf Stubby's leftover from my Aleph 5 project. As soon as I complete my Aleph ala Kristijan's board and power supply design I'll see how the CLC works and go from there.
Regards,
Dan
P.S. Thanks for the input Nelson.
The lower rail voltages may make it easier to find large doses of capacitance 'lying around'. I still have 28 of the 68,000uf Stubby's leftover from my Aleph 5 project. As soon as I complete my Aleph ala Kristijan's board and power supply design I'll see how the CLC works and go from there.
Regards,
Dan
P.S. Thanks for the input Nelson.
Dan,
If 68,000uF caps are used in pi CLC filter, what values of
bypass capacitor and indcctor should be used for Alpeh 2 PSU ? still 4.7 uF and 2.2 mH ? Thanks !
Rus
If 68,000uF caps are used in pi CLC filter, what values of
bypass capacitor and indcctor should be used for Alpeh 2 PSU ? still 4.7 uF and 2.2 mH ? Thanks !
Rus
I being a 'novice' will for the most part follow other people's designs (i.e. Krisitjan's) until I get alittle more experience under my belt. That's the best answer I can offer at this time.
Regards,
Dan
Regards,
Dan
Back to the Aleph-X 200w for a second.... after alittle preliminary research I can see that 1.2-1.5kva 28v Plitron toroid would be expensive. Probably a custom job. Anyone care for a quote?
Regards,
Dan
Regards,
Dan
1.5kva is one of the standard model. voltage change does not counted as custom job as I know. Magnetic shelding might be expensive or n/a as told.
After finishing my Aleph 5 in the near future. I may be enticed into starting to prototype a 200W Aleph-X power supply. It looks like the 1500VA Plitron toroid will be about $200CAN/$155USD. I think I have enough surplus capacitance and heatsinks to mock up a single monoblock. Anyone interested this particular experiement?
Regards,
Dan
Regards,
Dan
question is :
Is Aleph-x matured enough to compete with NP authorized Aleph ? I own both factory A 5 and 2, 2 is very good if you drive
effecient speakers.
Is Aleph-x matured enough to compete with NP authorized Aleph ? I own both factory A 5 and 2, 2 is very good if you drive
effecient speakers.
I assumed the Aleph 2 could drive fairly non-efficient speakers with 100-ish watts. Why do you specify efficient speakers?
Sandy.
Sandy.
What I would like to know is how does N.P. get double the power at 4 ohms out of the production amps? I would assume that they must be designed to deliver however much power at 4 ohms and then you just end up with less, or about half that at 8 ohms. He's got to be building huge high current supplies, much larger than anyone here has thought about building as of yet.......
Doesnt his 200 WPC XA use two 1.5 kva trannies?
Mark
Doesnt his 200 WPC XA use two 1.5 kva trannies?
Mark
I think the trick used by many amp producers is to under state the 8 ohm power so it is half of the 4 ohm power. Except for pure class A and amps with fully regulated power supplies, there will always be some voltage sag.
With SE class A amps, the voltage sag is already there at idle. As long as the bias current is there, the amp will double its output when the imp is halfed.
With SE class A amps, the voltage sag is already there at idle. As long as the bias current is there, the amp will double its output when the imp is halfed.
Mark,
In the case of the XA 200 my understanding from the literature is that it will not deliver more power into an impedance lower than 8 ohms.
You would need to refer to Passlabs for for specific information regards power/load deliver factors.
This issue is however not the case with the Aleph series which driver more power into lower impedances, but not double the power for 1/2 the load.
My your own point of view, design the class A bias/max volts output aound your speaker parameters and be a little conservative so as to allow for losses in the design.
There are plently of refererences and useful spreadsheets in the various X Aleph threads to assist here.
macka
In the case of the XA 200 my understanding from the literature is that it will not deliver more power into an impedance lower than 8 ohms.
You would need to refer to Passlabs for for specific information regards power/load deliver factors.
This issue is however not the case with the Aleph series which driver more power into lower impedances, but not double the power for 1/2 the load.
My your own point of view, design the class A bias/max volts output aound your speaker parameters and be a little conservative so as to allow for losses in the design.
There are plently of refererences and useful spreadsheets in the various X Aleph threads to assist here.
macka
To counter Mark's statement. I am seriously thinking of pursuing a 200W Aleph-X and I see the power supply as the least of my challenges. The 1.5kva transformers are readily available at Plitron who are only 30 minutes from where I live. I have enough surplus capacitance kicking around to get going. I would probably get some of the 68A IXYS bridge rectifiers from Percy Audio (ouch! $100USD). I have access to some nice oscilloscopes and mult-kilowatt load resistors. And I'm sure Nelson would keep dropping crumbs along the trail to make sure we wouldn't get too lost in the woods. He's already 'hinted', and I quote,
The power supply aside. The 200w Aleph-X facinates me for a number of reasons. Not the least of which being it is well beyond my particular abilities at this time. To complete just such a project by I would need a number of things including the support of the forum. It would be a risky personal challenge thing for myself. I would setting a goal well above anything I've done before and rolling the dice. But, I guess that's the part that intrigues me the most. Without taking any risks I will never find out just how far I can go.......
Regards,
Dan
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