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β24: A discrete, cascoded, fully-differential power amplifier - Page 7

post #91 of 309
5/19/08 at 11:11am
I started populating my boards last night. I now know the horror that is desoldering and soldering the JFET quads in their proper configuration. I read the warnings a thousand times, but I still followed the silk screen :slaps forehead:

I've ordered the rest of the parts for the β24 with the exception of the Panasonic electrolytics and the big MOSFETS. Those add up really fast, so I'm waiting for payday ;-)

I've got several ideas for casing and power supply options, but nothing definite yet.

Here's some camera phone eye candy:


My boards were waiting for me at home when I got home from VA yesterday. AMB really went all out on these. As I get more and more familiar with them, it becomes more and more apparent that they are works of art within themselves. It's apparent from the get-go that a LOT of time and effort went into this design, and for that I am truly thankful to AMB and the DIY community.
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post #92 of 309
5/19/08 at 2:19pm
Quote:
Originally Posted by amb View Post
Great news amb. Keep up the good work!
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post #93 of 309
6/13/08 at 5:32pm
06/13/2008 update:



Two nearly completed β24 boards (missing MOSFETS and rail caps)

Two nearly completed σ22 boards (missing MOSFETS and a few caps)

Two Plitron transformers

One more Digikey order and these will all be fully populated. Avel transformers for unregulated rails will be ordered at the end of the month.

Enclosure design nearly finalized.
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post #94 of 309
6/13/08 at 6:09pm
Awesome stuff The Rob.....
How much did the whole shebang cost you so far?
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post #95 of 309
6/13/08 at 6:22pm
Estimating roughly off the top of my head, you're looking at about half a G there.

My estimates have total build cost (including two enclosures, monster heat sinks, two more transformers, ε24 boards/parts, Front Panel Express work, speaker binding posts, XLR and RCA connectors, etc.) at around $1200.
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post #96 of 309
6/13/08 at 6:33pm
Thanks, not too bad then.
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post #97 of 309
6/23/08 at 10:01am
Thread Starter 

The first β24 is born!

It's alive and ready for this coming weekend's NorCal meet!

A lot more pictures and details are at headwize:
HeadWize: View Post [DIY Workshop > β24: A discrete, cascoded, fully-differential power amplifier]



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post #98 of 309
6/23/08 at 10:16am
Quote:
Originally Posted by amb View Post
It's alive and ready for this coming weekend's NorCal meet!
Awesome looking amplifier!
Seems like a lot of amplification for $1200..
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post #99 of 309
6/23/08 at 10:23am
Thread Starter 
Quote:
Originally Posted by krmathis View Post
Awesome looking amplifier!
Seems like a lot of amplification for $1200..
I actually spent quite a lot more than that on mine, because of the Hifi2000 case (expensive with all the options, and $$$ FedEx shipping from Italy to California), all the Front Panel Express work, and a very pricey Plitron transformer. I honestly don't know exactly how much I spent on this amp, because of the prototype nature of it, I bought many more parts than needed.
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post #100 of 309
6/23/08 at 10:36am
That is seriously impressive AMB. Everything about it is just a cut above anything I've ever seen before!

I very much look forward to listening impressions
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post #101 of 309
6/23/08 at 10:59am
Wow! That really looks great Amb!
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post #102 of 309
6/23/08 at 11:07am
Quote:
Originally Posted by amb View Post
I actually spent quite a lot more than that on mine, because of the Hifi2000 case (expensive with all the options, and $$$ FedEx shipping from Italy to California), all the Front Panel Express work, and a very pricey Plitron transformer. I honestly don't know exactly how much I spent on this amp, because of the prototype nature of it, I bought many more parts than needed.
I see!
But it still don't take the glory away...
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post #103 of 309
6/23/08 at 11:12am
Quote:
Originally Posted by amb View Post
I honestly don't know exactly how much I spent on this amp, because of the prototype nature of it, I bought many more parts than needed.
And I'm sure like many of us you probably didn't track expenses intentionally!

Amazing work as always, Ti.
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post #104 of 309
6/23/08 at 5:21pm
Quote:
Originally Posted by amb View Post
It's alive and ready for this coming weekend's NorCal meet!

A lot more pictures and details are at headwize:
HeadWize: View Post [DIY Workshop > β24: A discrete, cascoded, fully-differential power amplifier]
As I suggested earlier, you should be the first person who completed this amp. Congratulations, Ti. It's simply a masterpiece!

Mine is not so far due to moving from a custom made enclosure to a black 5U HiFi-2000 Pesante Dissipante and my crazy work schedule lately. I'm more or less finished the electronics part but the the mechanical work -the lions share of this build to my opinion- still need to be done. But sooner or later, I will surely complete my β24.
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post #105 of 309
6/23/08 at 5:27pm
So clean-looking... I'd almost be afraid to use it. I wonder what others' builds will look like, and if anyone will be selling completed versions.

What is the final weight of yours, amb?
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