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?
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?
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 ! 🙂
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
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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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!
Eric
Eric
I agree with Zen Mod - Aleph JX or BA-3 Balanced with lot of outputs.
Or a 'straight' Aleph, like the 5.
Or a 'straight' Aleph, like the 5.
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 =)
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 =)
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?
BA3, thought that was a small amp, is the sound of it better than the aleph jx?
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Six sinks at 0.35c/w each provides a total heat sink capacity of about 0.06c/w per chassis. This is right on target for an amp that will provide 100w into 8 ohms. You should see final thermal rise of 25-30c with this level of sinking. You want to make sure that you have an equal number of mosfets on each sink to evenly spread the heat. If you can't arrange things this way, think of mounting the mosfets on a thick copper bar that spans your sinks on each side of the amp.
And plugging both channels into a 15 A outlet will leave you with 1A headroom.
A 20A circuit or multiple circuits for the system will become a necessity.
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Yep, I installed a length of 10ga wire to a dedicated 30A breaker in my electric panel for my system... Though a 100w monoblock (24v rails * 7A bias * 2 sides = 336w) pulls just under 3A from the AC socket at 120v.
I just can't decide what to build!?
I want to try SuSy, yet still I want to try a design which is single ended as NP speaks good about, yep, both..
I have access to 14pcs of 0,368c°/w, so I can use 7 on each monoblock.
I'm thinking of starting a poll as I just cant decide..
Thé Alephs are the most interesting, and there are a few, A2, A4, A-X, AJ-X and then there is the BA3 and the F5V3..
Is there someone who have heard both the AJ & the AJ-X? I'm wondering if there are differences in how they sound.
Someone who have listened to both the F5V3 and the AJ-X??
Someone that has listened to the A2 and the AJ-X, Or the F5TV3?
The BA3, I haven't even read anything about it, so might need to check it up..
Oh, a last question, the reason the SuSy Aleph's don't give as much is because it essentially is two bridged channels, right? That's a negative thing.. I might build a pair of 4R speakers sometime, and then I would need to build a new one. BUT, it does still put out the same wattage in 8/6/4R, right? It just don't increase the output into lower loads, right? That, i might be able to live with assuming I'm correct in that it would still put out the same wattage, am I right?
You are right, as I have the PSU built, it is quite universal so I could try lots of amps, but I would like to build the sweetest sounding amp from the beginning..
Please, decide for me, as I can read and read and read and then read some more and I'm just getting more and more trouble deciding what topology/design & S-E or P-P.. So much to choose between, you gotta love the contribution Nelson has given us. It's so generous! But it gives me headache.. HeHe..
I want to try SuSy, yet still I want to try a design which is single ended as NP speaks good about, yep, both..
I have access to 14pcs of 0,368c°/w, so I can use 7 on each monoblock.
I'm thinking of starting a poll as I just cant decide..
Thé Alephs are the most interesting, and there are a few, A2, A4, A-X, AJ-X and then there is the BA3 and the F5V3..
Is there someone who have heard both the AJ & the AJ-X? I'm wondering if there are differences in how they sound.
Someone who have listened to both the F5V3 and the AJ-X??
Someone that has listened to the A2 and the AJ-X, Or the F5TV3?
The BA3, I haven't even read anything about it, so might need to check it up..
Oh, a last question, the reason the SuSy Aleph's don't give as much is because it essentially is two bridged channels, right? That's a negative thing.. I might build a pair of 4R speakers sometime, and then I would need to build a new one. BUT, it does still put out the same wattage in 8/6/4R, right? It just don't increase the output into lower loads, right? That, i might be able to live with assuming I'm correct in that it would still put out the same wattage, am I right?
You are right, as I have the PSU built, it is quite universal so I could try lots of amps, but I would like to build the sweetest sounding amp from the beginning..
Please, decide for me, as I can read and read and read and then read some more and I'm just getting more and more trouble deciding what topology/design & S-E or P-P.. So much to choose between, you gotta love the contribution Nelson has given us. It's so generous! But it gives me headache.. HeHe..
I've got an Aleph 4 and it is really a delight to listen to. I find my F5 quite tiresome after a short time.
I would put in a vote for a 32V BA-3 Complimentary with lots of outputs or an Aleph 5 or 4.
Any version of F5 with parallel devices (F5C or any F5T) helps with the 'tiring' aspect that some people talk about with the F5.
Any version of F5 with parallel devices (F5C or any F5T) helps with the 'tiring' aspect that some people talk about with the F5.
my decision for you is build the AlephJ
...but i think all here know your dilema to much amps to build and all are good 😀😀😀
but if you listen much to metal hard rock techno (fast musik) then you maybe should also think about the f5
my experience was the alephJ was to relaxed for to fast music
god thanks i have both so i can switch😀
...but i think all here know your dilema to much amps to build and all are good 😀😀😀
but if you listen much to metal hard rock techno (fast musik) then you maybe should also think about the f5
my experience was the alephJ was to relaxed for to fast music
god thanks i have both so i can switch😀
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