Aleph 4 Strickly DIY Project Build - Page 2 - diyAudio
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Old 28th August 2010, 02:37 PM   #11
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Anyone interested in producing their own PCBs I have just listed 2 x 10W UV tubes on E-Bay (Item No. 300460872551). These are 14" long and have 15mm pin spacing. They will fit any tube fitment that will accept 14" tubes, or, just use end caps.
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Old 29th August 2010, 05:24 PM   #12
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Anyone watching the build.

I am waiting for delivery of the resistors. I've had to buy over quantity on many of them so, anyone that needs some of the stranger values, I'll be getting lots of DALE 0.1% Resistors for the Aleph 4.
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Old 31st August 2010, 05:15 PM   #13
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Originally Posted by Andy5112405 View Post
After many requests I am now starting a thread to show how easy it is to build a STUNNING PassLabs Aleph 4 on a reasonable budget.

A quick visit to the http://www.kk-pcb.com/index.html web site will demonstrate where it all started.

I looked at the Aleph 2 - a stunning amplifier in its own right.
I looked at the Aleph 5 - which you would imagine to be better than the Aleph 4.

They are all EXCELLENT amplifiers, the choice is yours.

I chose the Aleph 4 as it had rave reviews in the Press and I already had one 35-0-35V 500VA Toroidal transformer going spare.

You have to appreciate that there are three main areas where all High-End amplifier construction can get VERY expensive.

1. HEATSINKS - ALL Class A Amplifiers need MASSIVE heatsinks.
2. TRANSFORMERS - ALL Class A Amplifiers need MASSIVE transformers.
3. PSU CAPACITORS - ALL Class A Ampliers need MASSIVE PSU capacitors.

NEW, these components alone can add up to well over £1000.

SECOND HAND, this is a completely different ball game.

So, the thread is a build project for an Aleph 4, within a shoestring budget.
Where appropriate I will give the source and cost of the new components for those that "Would never use Second Hand Stuff".
The links to the articles and service manuals no longer function. Is there somewhere I can see them, or where I can get a rundown of what these different Alphe amps are about.

I love my F-5, but would like a pass amp with more gain, perhaps one of these alphes?

Thanks,

russellc
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Old 1st September 2010, 06:05 PM   #14
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Try just entering KK-PCB into your search engine. The links are still perfectly valid.
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Old 1st September 2010, 06:07 PM   #15
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The PCBs are almost complete now.

Click the image to open in full size.

Note the different approach to mounting the input differential pair. My hunting found threads to indicate that these two need to be kept in close thermal equillibrium with each other. I have mounted a block of aluminium between them.

Any comments about the choice of component types would be much appreciated at this stage.
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Old 2nd September 2010, 08:49 AM   #16
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Hi Russell,

Here is the schematic of the Aleph 4.

Cheers

Andy

Click the image to open in full size.
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Old 2nd September 2010, 09:24 AM   #17
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Eeer gov, how many quids down the hatch so far ?
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Old 2nd September 2010, 10:49 AM   #18
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As I said at the start, if you build using BRAND NEW components you will spend literally £1000s of GBP.

I've been very patient and have just kept on searching the second hand market.

The only components that I have bought NEW are the 24 x IRFP244s and 6 x IRF9610s and the components for the larger circuit boards. So far I have only spent about £100 on NEW components and £200 on second hand bits.

The most difficult components to source second hand are the heatsinks. I was VERY LUCKY here and bought 7 x RF amplifier modules that were defective. They're all different colours but will all either be sprayed or anodized at the end of the build.
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Old 2nd September 2010, 11:27 AM   #19
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Thanks, I'll try the links the way you say. I've noticed a lot of older posts having Pass links no longer work since the trojan problems the site was having some time ago. Hopefully the info is still there.

Thanks,

russellc
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Old 2nd September 2010, 12:42 PM   #20
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Does this kk-pcb guy have the master's blessings?
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