That is one way.
Another is to cascode like Borbely using JFETs, which is much simpler.
In this case, because of the 4mA or so bias, I would recommend using J111 / J174 as cascode devices (instead of 2SK246 / 2SJ103).
You should get a good 5V Vds on the Toshiba's then.
And yes, have done that many times in various circuits, including my AX-J 100W.
Patrick
Another is to cascode like Borbely using JFETs, which is much simpler.
In this case, because of the 4mA or so bias, I would recommend using J111 / J174 as cascode devices (instead of 2SK246 / 2SJ103).
You should get a good 5V Vds on the Toshiba's then.
And yes, have done that many times in various circuits, including my AX-J 100W.
Patrick
Attachments
slr 5000 said:
It wont be an F5 anymore, and the sound you like may be gone too
I fear the same even with just double output pairs
I suppose that just the slightest change, and it will sound different
Maybe you need a good 60-100watt, class AB and 1ohm stable
I will probably get shot for saying that
In my opinion, the best way to increase power is to use an electronic crossover and as many F5 as there are voices.
Ehh, in some cases sure, but I would say that really depends
Anyway, that could be a lot of power consumption, and still 25watt
Anyway, that could be a lot of power consumption, and still 25watt
tinitus said:
Not true, and there are many other advantages to go this way.
Though this is quite a long story...
http://sound.westhost.com/bi-amp.htm
See all the article and specially go to:
1.4 - Actual vs Effective Power
My main system, with a 50W gainclone on the low (12" W 300 hz) and a trans 10W zenV4 on the high(5 1/4 full range) , active crossover and 92 db efficiency, sounds loader then 100W 90 db 2 way loudspeaker
if music were a single frequency, then multiple amps and multiple speakers would be no louder than a single amp and speaker.tinitus said:
But we all know that music is not a single frequency.
I use a 3 way active crossover.
1 x F5 for highs from 2khz
1 x F5 for mids /low mids from 120hz to 2khz
2x150w class ab for closed subs under 120hz.
Average efficiency is 92db
I can -in my home- hardly reach the power limits.
...I was forgetting: that sounds fantastic!
1 x F5 for highs from 2khz
1 x F5 for mids /low mids from 120hz to 2khz
2x150w class ab for closed subs under 120hz.
Average efficiency is 92db
I can -in my home- hardly reach the power limits.
...I was forgetting: that sounds fantastic!
bobodioulasso said:
I know
And sounds like impressive setup
But you also admit to use 150watt AB on woofer, which was my point, sort of 😉
Though. when I suggested paralel output transitors with slightly raised bias, it was turned down with " no more power and still 25watt"
Kind of same thing
As would be a more powerful power supply, mono amps etc.
Though I understood it was about having more power to drive ESL
And thats what I relate to
I asked for impedance specs, but no reply
I dont know if active crosssover and multiple amps is a possible option with ESL
We may misunderstand each other
I plan to do 2way, and use F5 to drive a compression driver/horn, and AB amp to drive 18" woofer
So we do agree, sort of
Dont worry
It was interesting
Must be because we dont have the 100% clean answer to it anyway
It was interesting
Must be because we dont have the 100% clean answer to it anyway
bobodioulasso said:
Starts from post 4366 😉
ESL
Isnt the problem having very low to infinite impedance
I don't think so. A current feedback is good for an impedende as much flat is possible. With an infinite impedence, the voltage swing will clip at very low volume.
Such as a voltage feedback amp will give zero current into an infinite load.
Aren't Quad amplifiers current feedback?
Aren't Quad amplifiers current feedback?
I don't know if we mean the same thing. If current feedback means transconductance or very high output impedence, then as the load goes up (at risonance for exemple) the current remains constant, while the voltage follows the impedence.
Or not
Or not
yes, output current is proportionnal to input voltage in a C.F. amp.
Some amplifier designs mix the two kinds of feedback.
http://pagesperso-orange.fr/jm.plantefeve/systeme.html
see: Voie "médium" à contre-réaction mixte
Some amplifier designs mix the two kinds of feedback.
http://pagesperso-orange.fr/jm.plantefeve/systeme.html
see: Voie "médium" à contre-réaction mixte
pro said:
If you read the article, you may discover "current feedback" is
misnamed, and really is more like low impedance voltage feedback.
😎
Hi Nelson,
We were not saying that the F5 is a current feedback amp but discussing about the benefits of such an amp (CFB) driving ESL speakers.
We were not saying that the F5 is a current feedback amp but discussing about the benefits of such an amp (CFB) driving ESL speakers.