Aleph 2 transformer power rating

lawka · 22nd December 2003, 02:47 AM

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.

jleaman · 22nd December 2003, 04:47 AM

Im using a single 1000 va Victoria Magnetics Toroidal per Aleph 2 Mono Block.

mefinnis · 22nd December 2003, 04:48 AM

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

wuffwaff · 22nd December 2003, 06:35 AM

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 it´s 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 can´t get more than twice the bias as peak output current.

william

trigon · 23rd December 2003, 11:59 PM

I have used 1500W for each channel in my Aleph 4s.

Very relaxed and efortless soundwise, meaning good.

Trigon

jrsun · 24th December 2003, 02:30 PM

Trigon

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

Alain Dupont · 24th December 2003, 03:26 PM

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.

moe29 · 24th December 2003, 05:47 PM

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.

trigon · 24th December 2003, 06:37 PM

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

jrsun · 25th December 2003, 05:00 PM

Thanks ! Guys

22nd December 2003, 02:47 AM	#1
lawka diyAudio Member Join Date: Nov 2003 Location: Hong Kong	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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22nd December 2003, 04:47 AM	#2
jleaman Banned Join Date: Apr 2002	Im using a single 1000 va Victoria Magnetics Toroidal per Aleph 2 Mono Block.

22nd December 2003, 04:48 AM	#3
mefinnis diyAudio Member Join Date: Feb 2001 Location: Adelaide, Australia	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

23rd December 2003, 11:59 PM	#5
trigon diyAudio Member Join Date: May 2002 Location: Canada	I have used 1500W for each channel in my Aleph 4s. Very relaxed and efortless soundwise, meaning good. Trigon

24th December 2003, 02:30 PM	#6
jrsun diyAudio Member Join Date: Sep 2003 Location: North NJ	Trigon Where did you get them ? What is the secondary voltage? Thanks !

24th December 2003, 03:26 PM	#7
Alain Dupont diyAudio Member Join Date: Sep 2003 Location: Paris - France	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.

24th December 2003, 05:47 PM	#8
moe29 diyAudio Member Join Date: Dec 2002 Location: Florida	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.

25th December 2003, 05:00 PM	#10
jrsun diyAudio Member Join Date: Sep 2003 Location: North NJ	Thanks ! Guys

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