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Old 25th March 2012, 06:03 PM   #1141
oiphy is offline oiphy  Norway
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artmachine thats sweet nice all the way.
whar are those heatsink, how much and where to buy?
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Old 25th March 2012, 07:44 PM   #1142
Horio is offline Horio  United States
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Very nice build!
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Old 25th March 2012, 08:05 PM   #1143
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Oiphy..I'll take the heat sinks from this Italian company
I choose the profile and they cut them for me.
872 DISSIPATORI DI CALORE - HEAT SINK
216x220x83 5kg piece x4


thanks Horio
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Old 26th March 2012, 08:31 PM   #1144
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aleph 5 with cases hi fi 2000Click the image to open in full size.

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amplifier built with pieces of recoveryClick the image to open in full size.

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Bosoz prototype
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Old 27th March 2012, 04:18 AM   #1145
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Quote:
Originally Posted by Salomon View Post
Hallo Aleph-X friends,

my new Aleph-X is ready.
I needed one year to build it. The magic eye shows the temperature of the heatsinks.
I use speaker protection pcbs to control the offset of each output against ground and switch the speaker outputs to ground if their is a high offset and immediately it switches the amp completely off. There is no relais in series of the signal path.
I start with 0,6V from each output to ground. Half an hour later you can measure under 100mV
This is only possible with a special thermal offset correction.

On my homepage you find a german description of the Amp and more pictures.
Maybe someone can translate it for the forum here. I think my english is not really good.

Aleph-X - HorstWolf.de
Wow! really impressive!

How many output devices per channel did you use? What caps are those (the big fat ones )

Ciao!
Do
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Old 27th March 2012, 09:48 AM   #1146
Salomon is offline Salomon  Germany
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Quote:
Originally Posted by pinnocchio View Post
Wow! really impressive!

How many output devices per channel did you use? What caps are those (the big fat ones )

Ciao!
Do
Hello pinnocchio,

I use 8 pieces of the EPCOS Sikorel 125C B41554 series long-life grade capacitors.
Each capacitor has 100.000F /25V
The supply ripple is 5mV with CLC filters

An info for the other readers:
The photos you find here in post #389
Pictures of your diy Pass amplifier

All together I use 16 FETs in the stereo configuration
The power consumption is about 600W
The supply ripple is 5mV with CLC filters

Its a high current amplifier with only +-16V DC Voltage, because I use it with Martin Logan Request Electrostatic speakers. They have 1,2 Ohm @ 20 Khz
To drive this speaker with a Aleph-X is only possible with low voltage and high current. With a higher supply voltage it is not possible to get it cool enough.


regards

Horst
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Old 27th March 2012, 12:17 PM   #1147
a.wayne is offline a.wayne  United States
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Sweet .......
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Old 2nd April 2012, 01:09 AM   #1148
Eric is offline Eric  United States
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Quote:
Originally Posted by Salomon View Post
All together I use 16 FETs in the stereo configuration
The power consumption is about 600W
The supply ripple is 5mV with CLC filters

Its a high current amplifier with only +-16V DC Voltage, because I use it with Martin Logan Request Electrostatic speakers.
WOW -so your running an Aleph-X with 16VDC rails and what looks like about 18A bias setting?!?

Isn't the amp running in "voltage starved" mode at this point? I thought you needed higher rails to push bias that high...
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Old 2nd April 2012, 05:36 PM   #1149
Salomon is offline Salomon  Germany
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Quote:
Originally Posted by Eric View Post
WOW -so your running an Aleph-X with 16VDC rails and what looks like about 18A bias setting?!?

Isn't the amp running in "voltage starved" mode at this point? I thought you needed higher rails to push bias that high...
Eric it is a stereo amplifier, not a mono block! See my pictures at #389 Pictures of your diy Pass amplifier
So you have to calculate it with 16V Rail voltage x4
Additional there a losses over the coils of the CLC filters and over the rectifiers.
Because this you have to calculate 16V (Rail voltage) + 1,5V (softrecovery rectifier losses) + 1V (Coil losses) x 4 x 7,5A = 555W.
You have additional losses in the two power transformers and a little bit on the front end board. So you get nearly 580W
If you would take a higher voltage and less current you have only little power driving 1,2 Ohm speakers. You need the high current for the eletrostatic speakers for the high frequencies. The sensitivity of of the electrostatic speakers is not bad. So I do not need very high output power and so I do not need high rail voltages. It sounds amazing and much better than most of the high power amps on the market.

Last edited by Salomon; 2nd April 2012 at 05:47 PM.
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Old 2nd April 2012, 05:44 PM   #1150
a.wayne is offline a.wayne  United States
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Quote:
Originally Posted by Salomon View Post
Eric it is a stereo amplifier, not a mono block! See my pictures at #389
So you have to calculate it with 16V Rail voltage x4
Additional there a losses over the coils of the CLC filters and over the rectifiers.
Because this you have to calculate 16V (Rail voltage) + 1,5V (softrecovery rectifier losses) + 1V (Coil losses) x 4 x 7,5A = 555W.
You have additional losses in the two power transformers and a little bit on the front end board. So you get nearly 580W
If you would take a higher voltage and less current you have only little power driving 1,2 Ohm speakers. You need the high current for the eletrostatic speakers for the high frequencies. The sensitivity of of the electrostatic speakers is not bad. So I do not need very high output power and so I do not need high rail voltages.
This is correct ....!!!
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