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Old 22nd December 2003, 02:47 AM   #1
lawka is offline lawka  Hong Kong
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Default Aleph 2 transformer power rating

Anyone can help to advise the selection of Transformer rating of above item.

Sometimes, the manuals of High End components always indicated likely 100 W at 8[, 200 W at 4[ & 400 W at 2[. It supposed that the power rating of transformer would lead to the end result?

Someone use the 1000 VA for single chanel but I heard most people to choose >=1300 VA. Could anyone advise the caluation to formulate the final result.
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Old 22nd December 2003, 04:47 AM   #2
jleaman is offline jleaman  Belgium
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Im using a single 1000 va Victoria Magnetics Toroidal per Aleph 2 Mono Block.
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Old 22nd December 2003, 04:48 AM   #3
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Transformer (VA) = 2-3 x constant power dissipation of amp

So, for Aleph2 = 3 x 300W

1kVA will be fine.

Regards

Mark

See: http://www.passlabs.com/pdf/powersupply.pdf
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Old 22nd December 2003, 06:35 AM   #4
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Default Re: Aleph 2 transformer power rating

Quote:
Originally posted by lawka

Sometimes, the manuals of High End components always indicated likely 100 W at 8[, 200 W at 4[ & 400 W at 2[. It supposed that the power rating of transformer would lead to the end result?

well it does help but in the first place the amp must be able to double its power output when you halve the load. This is only possible if the output current doubles. With an Aleph (X or not) the max. output current is a function of the bias and the ac-current gain. Normally you cant get more than twice the bias as peak output current.

william
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Old 23rd December 2003, 11:59 PM   #5
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I have used 1500W for each channel in my Aleph 4s.


Very relaxed and efortless soundwise, meaning good.


Trigon
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Old 24th December 2003, 02:30 PM   #6
jrsun is offline jrsun  United States
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Trigon

Where did you get them ?
What is the secondary voltage?
Thanks !
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Old 24th December 2003, 03:26 PM   #7
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On the PassLab site, go to

http://www.passdiy.com/gallery/aleph2-p1.htm

You have 3 projects on Aleph 2

1)- Use Toroids 1,5kW 33+33V per channel

2)- Use a 1KVA, 35-0-35 transformer with shielding from Victoria Magnetics. per channel

3)- Used Plitron 1000VA toroids with 33+33V secondaries, this gives about 46 VDC on the power rails per monobloc

Merry X-mas to all...

Alain.
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Old 24th December 2003, 05:47 PM   #8
moe29 is offline moe29  United States
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Check out my Aleph 2: LINK

If you build a CLC power supply - Get a transformer with 37v secondaries.
Not hard to get exspecially if you are having one built by Victoria Magnetics.
With a CL-60 thermistor on the mains for inrush protection, this
will give you 45 volt rails.
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Old 24th December 2003, 06:37 PM   #9
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Quote:
Originally posted by jrsun
Trigon

Where did you get them ?
What is the secondary voltage?
Thanks !

Hi jrsun

I've got them from Plitron and they are with ground wire and with shieldind cage as well. Primaries are 2 x 100 and 120 and secondaries are 2 x 40V before rectifier.

Here is the pic. and link of my Aleph 4

Trigon
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Old 25th December 2003, 05:00 PM   #10
jrsun is offline jrsun  United States
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Thanks ! Guys
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