Few evening hours spent on the first serious listening session with the First One V1.2 from this group buy (exactly the ones from post #1) and can surely confirm that it is clearly over performances of the First One V1.1 from exhibitions presentations. Sound is a bit more refined, scarly realistic vocals, even greater insight into recording material and all of these in a very polite way. Completely satisfied with the result. 
At this occasion I would like to express my gratitude to each and all of you, following this thread and also placing the orders, many thanks.
At this occasion I would like to express my gratitude to each and all of you, following this thread and also placing the orders, many thanks.
LC, I don't know how can you achieve that such low THD.
I assume you still uses input like VSSA because you do not like diamond buffer. But even I do in simulation, with cascode VSSA input and VAS using Hawksford cascode, I still get THD 0,0004% at 1kHz 😕
I assume you still uses input like VSSA because you do not like diamond buffer. But even I do in simulation, with cascode VSSA input and VAS using Hawksford cascode, I still get THD 0,0004% at 1kHz 😕
My guess would be an added driver stage between the VAS and the output.?...😉
I have already done that last year and used old medium Lateral MOSFET for the driver stage . The sound was good but I have damaged the amp and have not repaired it since then...
Your implementation is of course awesome .
Mine was done using modified boards with wiring....Fab
LC, I don't know how can you achieve that such low THD.
I assume you still uses input like VSSA because you do not like diamond buffer. But even I do in simulation, with cascode VSSA input and VAS using Hawksford cascode, I still get THD 0,0004% at 1kHz 😕
Will post tomorrow the plot from 1 W/8 Ohm/1 kHz, now is 4 AM here lol. 😉
I will place an order for a full kit for 2 channels , once it´s available , cause i hate looking for parts here and there .
Few evening hours spent on the first serious listening session with the First One V1.2 from this group buy (exactly the ones from post #1) and can surely confirm that it is clearly over performances of the First One V1.1 from exhibitions presentations. Sound is a bit more refined, scarly realistic vocals, even greater insight into recording material and all of these in a very polite way. Completely satisfied with the result.
Congratulations, that sounds very good. 🙂
I'm longing to hear them in my home
My audio system is ready for The First One 🙂
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LazyCat,is it possible to buy modules in a later stadium or is it a only once in a life time oppertunity?
OK guys, no problem, just a little patience for me to prepare the cases and SMPS-s. Please send an e-mail noted in post #1, so I will record the info and put you on the list.
Congratulations, that sounds very good. 🙂
I'm longing to hear them in my home
My audio system is ready for The First One 🙂
hehe nice
For lab testing KEF Cresta and Zu audio Soul Supreme.
For sound comparison Avantgarde Trio + Avantgarde Sub horn + two separate subs
and active K+H O 300. 😎
As I already explained in post #40, #45, there's no rush, nothing will be delivered before output mosfets received here and installed to PCB-s.
Regulary observe post #1 for the updated info, anyway you can send an e-mail just to have you on the GB list for the record.
As promised yesterday here's the measurement result for 1 Wrms (2,83 Vrms)/8 Ohm at 1 kHz.
1. Input sine signal 0,11 Vrms, THD1k=4,8 ppm, best what I can get from the card's signal generator
2. Output signal 2,83 Vrms/8 Ohm, THD1k=16 ppm
As seen from plots, input signal artefacts generated by audio card faithfully transferred to the output plus some distortions added. With better input signal we could just get to single digit ppm. 😎
Post #1 technical specifications updated according to measuring results. 😉
1. Input sine signal 0,11 Vrms, THD1k=4,8 ppm, best what I can get from the card's signal generator
2. Output signal 2,83 Vrms/8 Ohm, THD1k=16 ppm
As seen from plots, input signal artefacts generated by audio card faithfully transferred to the output plus some distortions added. With better input signal we could just get to single digit ppm. 😎
Post #1 technical specifications updated according to measuring results. 😉
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Yesterday, Andrej (LC) finnally bring new First One amplifier prototype to my home. I am sure it is the best amplifier ever tested in my system and probably one of the best I have ever heard. It is huge step forward from VSSA in terms of space, less distorsion and completely loss of grain, which VSSA have a fraction of it 😉
Fantastic job LC 😎
Fantastic job LC 😎