Aleph 4 Amp parts for Sale - New - unused

[gaudio12]

Hello everyone,

I have a variety of parts available that I originally purchased for 2 Aleph 4 amplifiers but I have never got around to build the amps. I can supply pics if anyone is interested. I am located in USA.

Update: See below for links to ebay and prices for each item.

1) 2 28V 650VA custom made toroidal transformers
2) 50 IRFP240 FETS
3) 2 sets of Aleph 4 PCBS (for 2 channels)
4) A box full of high qaulity audio electrolytic caps, diodes, heatshrink tubing, etc. All parts are orginally ordered for Aleph 4
5) 4 1.5mH inductors for power supply pi filter
6) 2 sets of beautiful heatsinks

I hand picked all of the parts. Why pay retail when you can get the parts with a huge discount.

[gmant123]

PM Sent!!

[KatieandDad]

Whoever buys these parts - you are in for a stunning amplifier.

Be careful with selection of C11, the 220uF electrolytic. I eventually used an Elma Simic II to get rid of some awful sibilance caused by a lesser component.

Other than that, match your MOS-FETs carefully and its a real breeze to build and a real joy to listen to.

The transformers seem a bit undervoltage though. The Aleph 4 uses 48V rails which would come from 35-0-35V transformers. And indeed I uses 35-0-35V.

Mines got 8 heatsinks. Two for each bank of 6 MOS-FETs. And it still runs at about 55 Degrees C with fan cooling.

[gaudio12]

Thanks KatieandDad for your comments. You are correct about the transformer being on the low side for the Aleph 4. I believe at one point, I was going to build the Aleph 5 which has a lower rail voltage.

[KatieandDad]

To give you an idea of the heatsinking for a fully specified Aleph 4.

The heatsinking needs to be HUGE.

You can see my finished Aleph 4 at Project | Homebuilt Hi-Fi - A user submitted image showcase of high quality home built hi-fi components.

Since I've aquired the amp from my now-in-laws. I've added a couple of 50mm fans above the capacitor banks.

Sorry about the photo, but this is just TOO HEAVY to lift - almost 50Kg.

The photo shows the 50mm fan at the front, there is another at the rear - each one above the capacitors banks. They are 12V fans run in series (ie 6V each) Therefore they run slowly and are VERY QUIET in operation.

[KatieandDad]

Bump - At the right price this is a real Gem.

[gaudio12]

Hello everyone. I've received a lot of inquiries about the parts so I decided to list them on ebay. I will not be selling all of the parts together but break them into smaller pieces similar to how I broke out parts in my original post. The first item I have listed on ebay is the power transformers. I originally purchased these for the Aleph 5 but you can use them for other designs as long as the rail voltage is correct. See listing here and let me know if you have any questions...

650VA 2x28VAC transformers | eBay

Greg

[gaudio12]

Hello again, I've listed all items except the the "box full of misc parts"..small caps, resistors etc... I will list that in the next couple of days. Everything else is listed on ebay here...

Transformers:
eBay - New & used electronics, cars, apparel, collectibles, sporting goods & more at low prices

IRFP240 FETs:
eBay - New & used electronics, cars, apparel, collectibles, sporting goods & more at low prices

Aleph 4 PCBs:
eBay - New & used electronics, cars, apparel, collectibles, sporting goods & more at low prices

Hammond 1.5mH 5A inductors:
eBay - New & used electronics, cars, apparel, collectibles, sporting goods & more at low prices

Heatsinks with fan:
eBay - New & used electronics, cars, apparel, collectibles, sporting goods & more at low prices

Greg