Hi Jay!
Did you try and test the FO1.4? Don't make a mistake comparing the sound to FO1.2 or 1.3.
I did try and I must say that FO1.4 gives the best bass I had at home, deep strong, articulated, tuneful, easy to follow.. I also did test with some other reputable designs with regulated and non-regulated designs. Most of them were with bipolar transistors. Naim NAP250.2, NAP200, LM3886 designs, Nuforce...
My speakers, Thiel CS3.7, go down to 33 Hz and have 10 inch bass.
FO1.4 had me to rethink the way I listen to the music, because I hear so much more than before.
Yes, I think that's possible. I have never heard the FO but I am interested to get the best amplifier by using similar topology (CFA) with LATFET. Imo, parallel latfet is a must to get the "best amplifier, ever" predicate 😉
FO SEMELAB output devices is inside engine room 2 parallel connected devices (dual die) so compared to other brands FO is configured with 4x output devices, look page 2 in attached SEMELAB application note.
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Ah, that explains the good review of the FO. Still, more will be better (a lot of increase in cost but may be only a few select ears that can hear the difference). May be later version of FO (tho commercially not too feasible, unless it comes with power, which is not what I have in mind)...
FO 1.4 L
It is posible that bass can be improved. LC just sent me these pics of the new freshly baked L modules where the output transistors are in paralell.
Since they are prototypes there are yet to be installed. Probably till the end of week. Then we shall hear the product (hopefully the LC's ban will be lifted by then).
It is posible that bass can be improved. LC just sent me these pics of the new freshly baked L modules where the output transistors are in paralell.
Since they are prototypes there are yet to be installed. Probably till the end of week. Then we shall hear the product (hopefully the LC's ban will be lifted by then).
Attachments
Not sure how related it is for sound stream but all versions prior to v1.4 including VSSA had feedback cap topology, with no feedback cap beside better linear amplitude response from down DC and up bass speed will also improve.
Attachments
Your statement that one pair is not sufficient, that is my conclusion too.
I'm trying to design amplifier that gathers all of the objective parameters that I believe related to subjective good sound. When aiming for this high objective, I found that LATFET is problematic (requires expensive solutions) especially in a CFA. May be easier using certain HEXFET.
Regarding latfet in a CFA, I believe that FO is the leader so far...
Jay,
If you want to build a high powered amplifier yourself and want it to be a CFA go over to the Slewmaster thread. They are obviously not designed as compact as what LC has created but there are designs with up to 5 pairs of mosfet if that is what you are looking to do.
If you want to build a high powered amplifier yourself and want it to be a CFA go over to the Slewmaster thread. They are obviously not designed as compact as what LC has created but there are designs with up to 5 pairs of mosfet if that is what you are looking to do.
Hi, thanks.
I have my own design "philosophy". From many of his designs, OS doesn't even favor his latfet output. I'm not looking for power. I'm after the best amp, whatever the topology or the amplifying device.
Break from daunting work week to give thanks...
I figured I had better give my thanks to everyone, before we get lost in what I am thanking about!
I like your ideas with both the Teflon and the multi strand wire. Aluminum foil or even aluminum tape are more accessible and affordable for most builders.
Yes, I was lost there awhile too. 😱
Thanks, Kindhornman, You are incredibly knowledgeable of the workings of different metals. I am sure if I had used any kind of oil, I could have prevented the tap breaking. 😱 given all the research I done on tapping, I am surprised I missed this! 😱
This amp continues to Amaze me. I can not believe an M-Audio DAC and my Cheap and Cheerful line arrays ($60 speakers) sound this good! I will have no problem picking out the drivers I want to use for my All Aspiring Array project! 😀
Right now, I am drooling over that Large version of First One v1.4. My Subs are seeming pretty slow compared to the arrays 😉
I figured I had better give my thanks to everyone, before we get lost in what I am thanking about!
I like your ideas with both the Teflon and the multi strand wire. Aluminum foil or even aluminum tape are more accessible and affordable for most builders.
Yes, I was lost there awhile too. 😱
Thanks, Kindhornman, You are incredibly knowledgeable of the workings of different metals. I am sure if I had used any kind of oil, I could have prevented the tap breaking. 😱 given all the research I done on tapping, I am surprised I missed this! 😱
This amp continues to Amaze me. I can not believe an M-Audio DAC and my Cheap and Cheerful line arrays ($60 speakers) sound this good! I will have no problem picking out the drivers I want to use for my All Aspiring Array project! 😀
Right now, I am drooling over that Large version of First One v1.4. My Subs are seeming pretty slow compared to the arrays 😉
Thank you very much for posting.
It seems the height of the modules is respected. Can you post the dimensions?
Cheers,
M.
IMHO using s-type Mosfet (like semelab and old Hitachi 2sk135 2sj50) is the way to get really good sounding amplifiers. The problem here is the highish internal impedanz.
So you have to use double fets or multiple in parallel.
i , for one , think the reason the F5 is not sounding as good as the First One, Goldmund, Bow Tech , Fetzilla aso... is that F5 uses d-types and all the others uses s-types.
When I was consultant @ Bow, we changed the ZZ-1 output S-types to D-types in Wazoo ( a better type than the Hex-Fets ) and got the same hazyness, vieling and a bit unnatural timbre as I hear in F5. Bass was better though as expected.
So you have to use double fets or multiple in parallel.
i , for one , think the reason the F5 is not sounding as good as the First One, Goldmund, Bow Tech , Fetzilla aso... is that F5 uses d-types and all the others uses s-types.
When I was consultant @ Bow, we changed the ZZ-1 output S-types to D-types in Wazoo ( a better type than the Hex-Fets ) and got the same hazyness, vieling and a bit unnatural timbre as I hear in F5. Bass was better though as expected.
I like your ideas with both the Teflon and the multi strand wire. Aluminum foil or even aluminum tape are more accessible and affordable for most builders.
🙂
I tried 3 aluminum tapes and the thinnest is the best, my tape was too wide (5cm) so I cut a piece of 2cm wide and the length of the cat5 cable.
You need to have the alu tape in one piece otherwise it's possible it's not electrical conductive because of the adhesive.
Cat5 cable, teflon plumber tape, aluminum tape: all cheap stuff from the local hardware store that makes a great cable 😀