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Old 19th January 2014, 07:31 PM   #1
sibbeli is offline sibbeli  Sweden
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Exclamation What to do.. Build Aleph JX or F5T V3 monoblocks?

Hey guys!

I have a problem. I was so certain the F5T was the amp I needed.
But, then I saw Peter Daniels old thread where he built a Aleph X. Then I start reading about supersymmetry and really really liked the idea and workings of it.. It is what NP uses in his commercial amps, and that can't be neglected, so what should I build?

I want the best. I want 100w monoblocks that works with and atleast gives as much in 4R as my speakers are 6R right thru the spectrum.

I want detailed sound, yet laidback and relaxing to listen to, not fatiguing sound.

Thé F5T v3 is an easy build, the aleph jx a bit more challenging but still achievable for me.


WHAT TO DO MY DEAR PASS FRIENDS?
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Old 19th January 2014, 07:38 PM   #2
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JX.
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Old 19th January 2014, 09:21 PM   #3
Zen Mod is offline Zen Mod  Serbia
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either JX or BA3 Bal
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Old 20th January 2014, 07:04 PM   #4
juma is offline juma  Serbia
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Quote:
Originally Posted by sibbeli View Post
... I want the best. I want 100w monoblocks that works with and atleast gives as much in 4R ...
If you choose any of the SuSy topologies, you should know that SuSy, in essence, means a bridged amp. To fulfill your demand (100W@4R) each side of the bridge has to be designed so to run comfortably at 2 Ohms load.
Since you want the best, that means class A all the way. Most favorable numbers (clean push-pull) tell us this:
For 100W at 4R we need 14V_peak of clean swing at each side of the bridge and 3.53A bias
For 100W at 8R we need 20V_peak of clean swing at each side of the bridge and 2.5A bias.
So, to achieve both (100W at 8R and 100W at 4R, all class A) we need each mono block to have +/24V PS voltage and 3.5A bias per side of the bridge (meaning 7A per channel) which gives us (together with PSU losses) a bit more than 350W of heat per one mono block.
Think of thermal and physical dimensions of that project - it's far from undoable but you should know what are you facing with.

Have fun !
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Old 20th January 2014, 08:58 PM   #5
gl is offline gl  United States
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I have built and currently use a 100 watt Aleph X with JFET inputs - two monoblocks actually. They drive a pair of MG3.6's which have a nominal impedance of 6 ohms. There is a thread on this site detailing the amps (search for "AX100" - the JFET update is near the end of the thread). I have been very happy with the sound. IMO the Aleph X is easy to build especially considering the wealth of information on this site. I did not blow up a single transistor in the process. Keep in mind that the Aleph X topology will put out fewer watts into 6 or 4 ohms than it does into 8 ohms.

A year or so ago I started to build a pair of 150W F5 Turbo monoblocks but after some experimenting I decided that scaling the design up was riskier than I was comfortable with.

I ditched the project in favor of building two BA-3B monos (150W-250W). The output sections will be followers and I'm much more comfortable building and experimenting with those. The BA-3B's will replace the AXJ's and like most of the builders here on DIYA, I anticipate that the new amps will sound better than the old ones.

I hope this helps.

Graeme
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Old 23rd January 2014, 12:52 PM   #6
Eric is offline Eric  United States
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Yep, what Juma says - be aware of the size and expense of the chassis you are building. See my Aleph-X building notes in my signature - they are big and heavy and eat lots of power. But they sound so very nice!

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Old 23rd January 2014, 04:16 PM   #7
6L6 is offline 6L6  United States
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I agree with Zen Mod - Aleph JX or BA-3 Balanced with lot of outputs.

Or a 'straight' Aleph, like the 5.
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Old 23rd January 2014, 05:26 PM   #8
OllBoll is offline OllBoll  Sweden
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Why build one when you can build both?

The cost is in the psu, heat sinks and box. As long as you can reuse those parts the cost to build 2 of each amp is insignificant.

Then you can build one of each and compare them, then build the amp you liked the least into another one of the one you liked =)
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Old 26th January 2014, 02:39 PM   #9
sibbeli is offline sibbeli  Sweden
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I am about to buy 42kg of heatsinks, each of the 12 sinks has 0,350c°/w rating and is 30*17*12 hwd so 6 on each block, 3 on each side, that should be more than enough, right?

BA3, thought that was a small amp, is the sound of it better than the aleph jx?
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Old 26th January 2014, 02:41 PM   #10
6L6 is offline 6L6  United States
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BA3 is as large as you want to build it. It's a very fluid design.
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