Pictures of your diy Pass amplifier

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#1,144
aleph 5 with cases hi fi 2000
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amplifier built with pieces of recovery
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Bosoz prototype
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#1,145
Salomon said:
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
Click to expand...

Wow! really impressive!

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

Ciao!
Do
 
#1,146
pinnocchio said:
Wow! really impressive!

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

Ciao!
Do
Click to expand...

Hello pinnocchio,

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

An info for the other readers:
The photos you find here in post #389
http://www.diyaudio.com/forums/pass-labs/166784-pictures-your-diy-pass-amplifier-39.html

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
 
#1,148
Salomon said:
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.
Click to expand...

WOW -so your running an Aleph-X with 16VDC rails and what looks like about 18A bias setting?!? :hot: 😱 :hot:

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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#1,149
Eric said:
WOW -so your running an Aleph-X with 16VDC rails and what looks like about 18A bias setting?!? :hot: 😱 :hot:

Isn't the amp running in "voltage starved" mode at this point? I thought you needed higher rails to push bias that high...
Click to expand...

Eric it is a stereo amplifier, not a mono block! See my pictures at #389 http://www.diyaudio.com/forums/pass-labs/166784-pictures-your-diy-pass-amplifier-39.html
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.
 
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#1,150
Salomon said:
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.
Click to expand...

This is correct ....!!!
 
#1,151
Huh...i googled pass amps...f5.. aleph...firstwatt...pass zen...etc and i do not get it. all these builds and talk of how but no schematics. a schematic is not a theory 4electure or a simplified inference. where are these elusive kept secret schematics?
after reading 1000 pages and having built an amp or two what is the deal?
 
#1,156
jacco vermeulen said:
One day someone may post some in braille.
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Here's one for F5. In TubeCad go to: File->Import->Braille

Edit: Apologies; It's actually the newer, larger one - F5TurboV3
 
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#1,157
An externally hosted image should be here but it was not working when we last tested it.


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Zen v4 - http://www.passdiy.com/pdf/zen-v4.pdf

F5 - http://www.firstwatt.com/pdf/prod_f5_man.pdf
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F3 -

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F4 -
80669d1173133405-f4-power-amplifier-f4-power-amplifier.jpg


Burning Amp 1 - http://www.passdiy.com/pdf/BA1 r1.pdf

Burning amp 2 - http://www.passdiy.com/pdf/BA2 r1.pdf

Burning Amp 3 - http://www.diyaudio.com/forums/diyaudio-com-articles/194809-burning-amplifier-ba-3-a.html
 
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