Hi, analog_sa,
Offcourse...How silly of me. I just never heard of Electrocompaniet name, I never know what series they are making, I tought they only make that 25W amp.
So, they make alot of models. Is the basic topology the same as the 25W or different?
The company itself still exist (can look at the website), but it seems they do not make audio power amps anymore.
At least now I know there is series AW180 and AW250. What watt rating are they?
Offcourse...How silly of me. I just never heard of Electrocompaniet name, I never know what series they are making, I tought they only make that 25W amp.
So, they make alot of models. Is the basic topology the same as the 25W or different?
The company itself still exist (can look at the website), but it seems they do not make audio power amps anymore.
At least now I know there is series AW180 and AW250. What watt rating are they?
I've just built an amp quite similar, at least similar for the vas.
It uses normal ccs-fed singlediffamp, this kind of currentmirrored
vas and my standard tripledarlingtonout. I can post schematic later...
The results from this were surprising, the quality overwhelmed me,
it's definitely the best amp i've ever heard. It has some warm and
natural sound, but is extremely detailed with superb separation,
and a real asskicking bass !
Seems, that this kind of topology has very much potential !
Sims showed that the amp is very fast, polefreq is at ~27Mhz.
Mike
It uses normal ccs-fed singlediffamp, this kind of currentmirrored
vas and my standard tripledarlingtonout. I can post schematic later...
The results from this were surprising, the quality overwhelmed me,
it's definitely the best amp i've ever heard. It has some warm and
natural sound, but is extremely detailed with superb separation,
and a real asskicking bass !
Seems, that this kind of topology has very much potential !
Sims showed that the amp is very fast, polefreq is at ~27Mhz.
Mike
"Snubbers", T:s and Z:s
I thought I'd just point out that the schematic shown is snubberized with 0.68µF in series with 1ohm, all in parallel with 0.1µF.
Also, it uses an inverting configuration with a T network feedback. and a classic Zobel on the output.
Interestingly, there's no Miller cap, all the compensation is emitter-emitter on the diff pairs, plus an input roll-off.
What do we make of al that?
Judging from the schematics, there might have been issues with idle current run-away when the bias trim pot gets old.
Rune
I thought I'd just point out that the schematic shown is snubberized with 0.68µF in series with 1ohm, all in parallel with 0.1µF.
Also, it uses an inverting configuration with a T network feedback. and a classic Zobel on the output.
Interestingly, there's no Miller cap, all the compensation is emitter-emitter on the diff pairs, plus an input roll-off.
What do we make of al that?
Judging from the schematics, there might have been issues with idle current run-away when the bias trim pot gets old.
Rune
I remember hearing a EC amp with the SEAS Thor at a DIY speaker shop here in norwy some time ago. i had my favourite cd with me for the occation. that's how i got the bug.
I almost cried like a litle baby, the music sounded so damn beautiful, natural and rich.
I wont be satesfied untill i'v managed to build something that sound so damn beautiful, or better.
I almost cried like a litle baby, the music sounded so damn beautiful, natural and rich.
I wont be satesfied untill i'v managed to build something that sound so damn beautiful, or better.
Hmm, i like it simple ! After having bypassed the electrolytic with
a 100nF filmcap the sound was ... perfect !
I think this is the one for me, still need to test with higher supply
of 36volts, but i have no suitable torid yet. Hopefully sound doesn't
get much changed with higher voltage.
DC is ~2mv, so i see no need for DC-servo.
Mike
a 100nF filmcap the sound was ... perfect !
I think this is the one for me, still need to test with higher supply
of 36volts, but i have no suitable torid yet. Hopefully sound doesn't
get much changed with higher voltage.
DC is ~2mv, so i see no need for DC-servo.
Mike
> Hmm, i like it simple !
> After having bypassed the electrolytic with
> a 100nF filmcap the sound was ... perfect !
> DC is ~2mv, so i see no need for DC-servo.
A cap is also a solution, i know this, but maybe you should try a DC servo later with LF411.
(Just as a test, to give a chance for alternative solutions !
)
> I think this is the one for me, still need to test with higher supply
> of 36volts, but i have no suitable torid yet. Hopefully sound doesn't
> get much changed with higher voltage.
Waiting for the results !
And why do U used MPSA-s in the input instead of BCs ?
> After having bypassed the electrolytic with
> a 100nF filmcap the sound was ... perfect !
> DC is ~2mv, so i see no need for DC-servo.
A cap is also a solution, i know this, but maybe you should try a DC servo later with LF411.
(Just as a test, to give a chance for alternative solutions !
)> I think this is the one for me, still need to test with higher supply
> of 36volts, but i have no suitable torid yet. Hopefully sound doesn't
> get much changed with higher voltage.
Waiting for the results !
And why do U used MPSA-s in the input instead of BCs ?
anybody actualy built this?
http://users.otenet.gr/~athsam/electrocompaniet.htm
i am realy tempted now
http://users.otenet.gr/~athsam/electrocompaniet.htm
i am realy tempted now
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