Patrick, I am very very happy with the result🙂🙂
The amplifier is .... SUPER!!!
Thanks very much for your help!🙂
Vitali
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Freaking nice build.
All I can say is I'm Jealous. Thats one of my favorite builds I have seen.
Freaking nice build.
All I can say is I'm Jealous. Thats one of my favorite builds I have seen.
looks great! that is how i'm building mine actually (the heatsink orientation). have you run into any problems w/ it overheating since air cannot flow vertically through the fins?
The heatkins is 400x160x83mm.
U = 15V, Bias = 2A (4A total)
Maximum temperature heatkins - 48...50 degrees (room is 26 degrees)
Transformer - 2x13V/800W
MUR 3060
CRC : 2x47000-0,15R-2x47000
Regards,
Vitali
It's balanced amplifier Patrik (EUVL)
I thank you very much!
I measured the power, but I certainly have 50W / 8
vitalica
50watt@8ohm for class A is awesome!
Your build is following exactly on this?
2X13V? isn't the supply of the Vac should be around 16+/- to get a +/-23Vdc?
can u explain more in this? i just need to learn more. 😀
50watt@8ohm for class A is awesome!
Your build is following exactly on this?
2X13V? isn't the supply of the Vac should be around 16+/- to get a +/-23Vdc?
can u explain more in this? i just need to learn more. 😀
He built according to a circuit EUVL talked about a while back. Its a different voltage than original F5. Less voltage = Less heat. Then its biased up a lot which probably brings it back to the same amount of heat lost in original F5, or close.
Uriah
Uriah
vitalica
50watt@8ohm for class A is awesome!
Your build is following exactly on this?
2X13V? isn't the supply of the Vac should be around 16+/- to get a +/-23Vdc?
can u explain more in this? i just need to learn more. 😀
I agree with Uriah🙂
To get 2A bias voltage must be smaller - 15 ...16V.
The maximum I run parts like this is 50W each, assuming
that there's lots of heat sinking. This means that at +/- 21V
rails, you could try for 2.5 amp bias.
Lots of heat sinking...
😎
that there's lots of heat sinking. This means that at +/- 21V
rails, you could try for 2.5 amp bias.
Lots of heat sinking...
😎
I want to share some more impressions for the f5.
As I said I use large skins, so after many hours the temperature stays to about 40oC, so after reading I started playing with the bias...
0.60v >>> 40oC >>> 65oC (mosfet)
0.71v >>> 43oC >>> 80oC (mosfet after 30min)
The weird is that the two of this positions gives a different sound!
The big difference was in the bass area and the mids (I beleive highs were the same)
So my results,
in 0.60v I had a huge, great bass (the midbass was thin), the mids were little behind and the highs were very good
in 0.71v the bass gone away but the midbass became huge, the mids left the veil and became huge (I liked them, but where is the bass), the highs also had a little better volume.
now 0.65v and here are all, perfect balance for all.
Anyone with the same experience?
As I said I use large skins, so after many hours the temperature stays to about 40oC, so after reading I started playing with the bias...
0.60v >>> 40oC >>> 65oC (mosfet)
0.71v >>> 43oC >>> 80oC (mosfet after 30min)
The weird is that the two of this positions gives a different sound!
The big difference was in the bass area and the mids (I beleive highs were the same)
So my results,
in 0.60v I had a huge, great bass (the midbass was thin), the mids were little behind and the highs were very good
in 0.71v the bass gone away but the midbass became huge, the mids left the veil and became huge (I liked them, but where is the bass), the highs also had a little better volume.
now 0.65v and here are all, perfect balance for all.
Anyone with the same experience?
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The bass doesn't go away. Your perceptions are shifted by
the emergence of midrange and top end. Usually this will
be corrected after your ears acquire some more experience
with the sound.
😎
the emergence of midrange and top end. Usually this will
be corrected after your ears acquire some more experience
with the sound.
😎
My english is not good enough, in addition I can not express my thoughts correctly... I agree with "are shifted by the emergence of midrange and top end" everything is around balance and I tried to describe it, my speakers are ob (bass rolloff )
Yes I get excited with small changes!
Yes I get excited with small changes!
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Thanks for sharing. That is really good information. I dont recall anyone posting listening impressions based on
0.60v >>> 40oC >>> 65oC (mosfet)
0.71v >>> 43oC >>> 80oC (mosfet after 30min)
0.60v >>> 40oC >>> 65oC (mosfet)
0.71v >>> 43oC >>> 80oC (mosfet after 30min)
Ok, Mr. Pass, are you saying that the "sound" of the amp changes with bias setting?
Is this a measurable change in frequency response?? Or?
_-_-bear
Is this a measurable change in frequency response?? Or?
_-_-bear