Mattsoft is operated by DAN FRASER, Costa Mesa - California
The wonderfull United States of America!........ Bush is the exception of that wonderfull country, made of a lot of people from wide world...but this one, the Mr. President, is not eternal....one day i will be free of him....other will took his place.
regards,
Carlos
The wonderfull United States of America!........ Bush is the exception of that wonderfull country, made of a lot of people from wide world...but this one, the Mr. President, is not eternal....one day i will be free of him....other will took his place.
regards,
Carlos
🙂 🙂
sir Carlos;
actually I got no scanner around but well then I'll post pictures of mine soon .
before anything else, thanks for your accomodation.
And do you mean the YAMAHA P2200 original sheme?
If so, I'll be very happy to this to diy friends here at home. So they will not be spending much effort thinking about what this thing (P2200) really is. whats its kind ? real performance? etc.
regards;
macweb (for short)
😀 😀
sir Carlos;
actually I got no scanner around but well then I'll post pictures of mine soon .
before anything else, thanks for your accomodation.
And do you mean the YAMAHA P2200 original sheme?
If so, I'll be very happy to this to diy friends here at home. So they will not be spending much effort thinking about what this thing (P2200) really is. whats its kind ? real performance? etc.
regards;
macweb (for short)
😀 😀
Re: No, i personally do not believe it can hold so big voltage.
Hi Carlos !
Hmm, ft of a transistor is something else, not the 3db roll off.
The rolloff is mainly dominated by the outputcapacity and the size
of the resistors at collector and so on.
ft is the frequency where the transistor reaches currentgain of 1.
That's why it's called "current-gain bandwidthproduct"
Cortez, of yourse you can't use the bc546/556 in vas with supply
voltage above ~30volt. Like Carlos said, in diffamp voltageswing
is minimal (~inputvoltage).
The choice of transistors here depend on the current in the vas.
In my tripledarlingtons i use currents below 2ma, this enables the
use of 2n5401/2n5551.
But without tripledarlington you need at least 10ma, that would cook
these transistors at such high voltages.
Mike
destroyer X said:
Hi Carlos !
Hmm, ft of a transistor is something else, not the 3db roll off.
The rolloff is mainly dominated by the outputcapacity and the size
of the resistors at collector and so on.
ft is the frequency where the transistor reaches currentgain of 1.
That's why it's called "current-gain bandwidthproduct"
Cortez, of yourse you can't use the bc546/556 in vas with supply
voltage above ~30volt. Like Carlos said, in diffamp voltageswing
is minimal (~inputvoltage).
The choice of transistors here depend on the current in the vas.
In my tripledarlingtons i use currents below 2ma, this enables the
use of 2n5401/2n5551.
But without tripledarlington you need at least 10ma, that would cook
these transistors at such high voltages.
Mike
This gives increased current through the driver with rising output.
But i'm not sure if this is good, as the current on other side decreases.
You need to sim to check if this is helpful.
The feedback is not strange, it's an inverting amplifier.
But i'm not sure if this is good, as the current on other side decreases.
You need to sim to check if this is helpful.
The feedback is not strange, it's an inverting amplifier.
Hienrich, sorry, the amplifier i found is not Yamaha 2200
The one i found was Harman Kardon PA2200.
I am very sorry, i think this Yamaha is more difficult to find.
Carlos
The one i found was Harman Kardon PA2200.
I am very sorry, i think this Yamaha is more difficult to find.
Carlos
p2200
🙂 🙂 🙂
no, no,no,
Sir Carlos,
it's ok. it's just alright for me.
most important is the hospitality youve shown to us. 😀
your 0% distortion accomodation for newbees.
going back to the Ampslab cousin. what about raising the value of the
two output driver's 33ohm resistors higher, the scheme I've shown,
in first place I've also used 33ohm with the drivers but the sonic
production was harsh and agressive even with the exact bias currents.
But when I replaced this with a higher value until I reached 150ohm
the sonic output was clean and dynamic (for me).
But raising more further seems weakens the bass, raising more than 220ohms.
All this things are different when using the DEEP DARLINGTON topology
For me, because I have also experienced the LEACH amp,
I found it weak in bass.
but its really different with ROTEL RB991 (which I've also cloned maybe 95% of it becuase I removed the DC offset and not use the original parts stated in the scheme).
Sonic output was involving.
so then becuase we are still capable of brewing new designs,
Jan Dupont's LYNX amp might be my next project.(in which I have already prepared its PCB's).
also thanks to Jan, he's just open my mind more wider.
macweb
rotels RB991 link:
http://www.zero-distortion.com/downlaod/extra_dl.htm
🙂 🙂 🙂
no, no,no,
Sir Carlos,
it's ok. it's just alright for me.
most important is the hospitality youve shown to us. 😀
your 0% distortion accomodation for newbees.
going back to the Ampslab cousin. what about raising the value of the
two output driver's 33ohm resistors higher, the scheme I've shown,
in first place I've also used 33ohm with the drivers but the sonic
production was harsh and agressive even with the exact bias currents.
But when I replaced this with a higher value until I reached 150ohm
the sonic output was clean and dynamic (for me).
But raising more further seems weakens the bass, raising more than 220ohms.
All this things are different when using the DEEP DARLINGTON topology
For me, because I have also experienced the LEACH amp,
I found it weak in bass.
but its really different with ROTEL RB991 (which I've also cloned maybe 95% of it becuase I removed the DC offset and not use the original parts stated in the scheme).
Sonic output was involving.
so then becuase we are still capable of brewing new designs,
Jan Dupont's LYNX amp might be my next project.(in which I have already prepared its PCB's).
also thanks to Jan, he's just open my mind more wider.
macweb
rotels RB991 link:
http://www.zero-distortion.com/downlaod/extra_dl.htm
Yes hienrich, that 33 ohms seems to be trouble, as it is a very strange value there.
And the value have influence in the bass...yes!
In special when that resistor is "floating"....not connected in output line...alike two 220 ohms from each driver emitter to output line.
I am looking to that amplifier, with my soul full of dark suspections.
That's the reason i came here and post it to see what the guys will tell me, and also, the reason why i did not make nothing more than separate parts.
But i did not start anything, and is possible not to assemble this one.
regards,
Carlos
And the value have influence in the bass...yes!
In special when that resistor is "floating"....not connected in output line...alike two 220 ohms from each driver emitter to output line.
I am looking to that amplifier, with my soul full of dark suspections.
That's the reason i came here and post it to see what the guys will tell me, and also, the reason why i did not make nothing more than separate parts.
But i did not start anything, and is possible not to assemble this one.
regards,
Carlos
A new forum appeared, diyhifi.org, and many friends are there too.
I laugh when i saw the Mr. Till Pape avatar with the same wooden twetter cone he used..... it seems a Christmas bell.
And there, he is called "One more northern victim"...ahahahaha
I laugh with all strengh i had.... was funny those banish people call themselves as victim. This means a good sense of humor.
hehe
Carlos
I laugh when i saw the Mr. Till Pape avatar with the same wooden twetter cone he used..... it seems a Christmas bell.
And there, he is called "One more northern victim"...ahahahaha
I laugh with all strengh i had.... was funny those banish people call themselves as victim. This means a good sense of humor.
hehe
Carlos
first post
Hello every one,
I make this post because I would like to ask destroyer X a couple of questions about a amp which he has modified and has posted about in this thread. I think it is the
HX350 by Audio Labs. Unfortunately the system doesent let me email him before I post something so I this is my first post here. =)
Im looking for a mosfet power amp- may be a kit- which is really strong and stable,
for electric Bass.
I would also appreciate any info on comercial pa like power amps with mostfet technology. For some reason bipolar and class D types dont sound and feel as good when you play with a Instrument over it.
Regards Bass-or-drums
Hello every one,
I make this post because I would like to ask destroyer X a couple of questions about a amp which he has modified and has posted about in this thread. I think it is the
HX350 by Audio Labs. Unfortunately the system doesent let me email him before I post something so I this is my first post here. =)
Im looking for a mosfet power amp- may be a kit- which is really strong and stable,
for electric Bass.
I would also appreciate any info on comercial pa like power amps with mostfet technology. For some reason bipolar and class D types dont sound and feel as good when you play with a Instrument over it.
Regards Bass-or-drums
I do not remember, even that i have opened this thread... so, i have to read it once
again.... give me some time, and then i will answer you.
regards,
Carlos
again.... give me some time, and then i will answer you.
regards,
Carlos
Re: I do not remember, even that i have opened this thread... so, i have to read it o
Im not sure if you opened the thread
dont worry about the thread,
I have some questions regarding the amps labs type of amplifier
if you could email me your email =)
I found some other thread which discusses that kind of amp too.
=)
by the way, very very cool forum =)
Im not sure if you opened the thread
dont worry about the thread,
I have some questions regarding the amps labs type of amplifier
if you could email me your email =)
I found some other thread which discusses that kind of amp too.
=)
by the way, very very cool forum =)
destroyer X said:
I cannot tell you nothing about FET... i have small experience with FET
I have only tested 2 units..... one was great...other not.
I have some ideas about FET sonics, some friends say it is mine ignorance, but for sure my ideas about are not the same as yours.
I have not a conclusion, not experienced with Fets to formulate evaluations those days.
I have many Fets here now a days...but i have some resistance to use them.... so... i am not the one to talk about those kind of transistors.... Nelson Pass...into his thread, for sure can talk about fets...also one of the "always oppened" discussions about the subject we have into the solid stage main page.
here:
http://www.diyaudio.com/forums/showthread.php?postid=1206980#post1206980
regards,
Carlos
I have only tested 2 units..... one was great...other not.
I have some ideas about FET sonics, some friends say it is mine ignorance, but for sure my ideas about are not the same as yours.
I have not a conclusion, not experienced with Fets to formulate evaluations those days.
I have many Fets here now a days...but i have some resistance to use them.... so... i am not the one to talk about those kind of transistors.... Nelson Pass...into his thread, for sure can talk about fets...also one of the "always oppened" discussions about the subject we have into the solid stage main page.
here:
http://www.diyaudio.com/forums/showthread.php?postid=1206980#post1206980
regards,
Carlos
Re: I cannot tell you nothing about FET... i have small experience with FET
I see thanks any way =)
I see thanks any way =)
destroyer X said:
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