I have a danish manual on Hiraga, contains spec sheet on all devices etc
It was available as "kit" and 100% copy of original, supply and everything, excl case
I built it too
dates back from 1984
I have articles from danish "HighFidelity"
Careful study and explaining of 8watt "Monster"
History, background, schematics, the whole lot
Dates back from 1987
It was available as "kit" and 100% copy of original, supply and everything, excl case
I built it too
dates back from 1984
I have articles from danish "HighFidelity"
Careful study and explaining of 8watt "Monster"
History, background, schematics, the whole lot
Dates back from 1987
Attachments
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Just got a mail that my 1meter heatsink is ready to be shipped
Expencivebut the best I could find
45kilo shipped weight, man thats one heavy chunk of aluminium
is that going to be big enough? maybe you should order a few more just in case
So the temperatures (Celsius) results with bias 1,17 to 1,2 A for my amp after 3 hours:
Big heatsink - 45 ;
small sink - 60;
trafo - 32;
bridge 42.
I think i should buy mica instead of silicon pads.
yes - and it sounds great.
picture of 32000Hz sin wave, square i cant get from old generator - its looks like drunk square
Big heatsink - 45 ;
small sink - 60;
trafo - 32;
bridge 42.
I think i should buy mica instead of silicon pads.
yes - and it sounds great.
picture of 32000Hz sin wave, square i cant get from old generator - its looks like drunk square
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Tone generator.
Tone Generator Software - Audio Test Tone Generator Download
There are many others.
I use wavelab by Steinberg
Tone Generator Software - Audio Test Tone Generator Download
There are many others.
I use wavelab by Steinberg
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posts #4 , #14 , #20 , #23 , #28, #31 .... and even more further in thread ;
read what is said and be aware that Profet probably had more internet hits tnx to Nelson and greedy boyz at DiyA than before that .....
I'm Roger & Over of that issue - feel free to think what you want
Wahab,
have you ever built or/and listened to a Profet?
Have you ever built or/and listened to an F5?
Or did you run simulations only?
Had you the opportunity to compare them by listening?
Or did you just look at the schematics?
What are the things that make your opinion?
We would like to know.
have you ever built or/and listened to a Profet?
Have you ever built or/and listened to an F5?
Or did you run simulations only?
Had you the opportunity to compare them by listening?
Or did you just look at the schematics?
What are the things that make your opinion?
We would like to know.
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hi, bobo,
well, in france, where i live, the profet was(and still is) seen as a high end audio amp, and i didn t escape the thing, as i did built a sample using
2SJ48/2SK133 , the T03 120V version of hitachi s lateral fets.
I went as far as testing it with 6 case/channel , to balance
the high RDSon of these devices..
the sound was good, but i found it not as good than the
complementary differential using the same fets as output devices...
nowadays, i didn t say that these amps are bad, moreover, i think that
they sound very good in respect of the very simple designs..
all i can say is that push pull designs without enough negative feedback produce a lot of third harmonics even in class A, thus, rendering the harmonic 2 canceling useless...
in my tries, the simple topologies work well in class A, but they can t match
a complementary differential with push pull biased in class A or even deep
class AB...
all the best
wahab
Its ok, and we wont try to convince you of anything else by suggesting to build F5
Thats what its about
Im sure you will find good AB amps around here too
If not, it might be a chance to start a thread with your amp
These HEXFETs have 7 times more transconductance than Hitachi's laterals so you can't make such a direct comparison.
The F5's measurement results can be seen here:
http://www.firstwatt.com/downloads/F5 Power Amplifier for PassDIY.pdf
(H3 at 1W at 8 Ohms load at 1Khz is about -97dB)
If you are after measured results this is not bad, right?
