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Old 3rd August 2010, 01:09 PM   #121
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Quote:
Originally Posted by destroyer X View Post
Replacement suggestions.

This BC840 is the one reduces a lot distortion..but you can try a bigger one, alike MJE340/350....also i think 2N5401/5551 may work too.

To the drivers and CCS, you can use other transistors able to dissipate 10 watts and units that can face 200 volts or more from colector to emitter..there are millions of units you can use....current will not be the problem...and even the smaller one in To220 case will be able to face that current or more.

To the drivers you can even use the same transistors you use in the ouput..they can work fine there too, despite some small loss in gain...also i have used the power transistor as CCS to drivers.

BC546/556 can be substituted by 2N5401/5551 and other million of models, ancient and new models.

The output transistor may be units that can operate with more than 200 volts from colector to emitter, units able to face 5 amperes or more from colector to emitter, units to dissipate 100 watts or more.... so, these one you mentioned will fit...and other millions of transistors will fit too.

I am not the best one to suggest options of transistors, but at least i have tried to help...let's listen others....wait a little bit to see if other suggestions will be posted...as these guys are crazy to help..you see how they have jumped in the thread?... crazy to help maybe...we gonna see that soon.

Discussions man...people do not read the thread and come to discuss....i was already very damned with my amplifier and was screaming with the amplifier..saying why he have not burned when Mr. Soa arrived.

ahahahahahah!

Here we do not earn money..but at least we have lots of fun!

Dear Eesbiboi, i have a lot to do, and i cannot stay here for too long..will let you with these folks that for sure will work hard to help you.

Carlos

daghan salamat sir carlos,

so this means...
BC840 = MJE340/350 = 2N5401/5551
BC546/556 = 2N5401/5551
output tranny = 2sc5200/a1943
drivers = output trannies...

id rather say CONSULTANTS/ADVICERS...
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Old 3rd August 2010, 01:22 PM   #122
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Quote:
Originally Posted by eesbiboi View Post
daghan salamat sir carlos,

so this means...
BC840 = MJE340/350 = 2N5401/5551
BC546/556 = 2N5401/5551
output tranny = 2sc5200/a1943
drivers = output trannies...

id rather say CONSULTANTS/ADVICERS...
TOTALLY wrong advice , those devices are as different as cars and trucks , night and day.

MR. SOA = "This is only a starting point, because we must have a safety margin. Remember that the peak dissipation into a reactive load with a 45 phase angle is almost double that calculated above, about 1900W. If the transistors can be maintained at 25C (not likely), that's fine, but we need to add more to allow for elevated temperature. I have elected to use 9 output devices, with a tenth device used as a driver. This maintains worst case peak dissipation at 212W - not much of a safety margin, but it should be ok in practice - in part because the supply voltage will collapse under load. "

quote from Rob elliot - ESP audio

This is not a toy amp , like DX original this is a BOMB!!
OS
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Old 3rd August 2010, 01:37 PM   #123
Krisfr is offline Krisfr  United States
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Having built and tested a design more than 20 years ago that had plus and minus 120 volt rails, I am finding it hard to understand what the danger is here.

Is it the DESIGN or the voltages being worked with?

I used TWO Dunlap Clarke transformers to develop the voltages above.

I used 6 GE caps, three for each rail that where rated at 150 volts and either 20,000 or 40,000 uf each, (sorry my memory is not what it used to be).

This was for a SINGLE channel of a 746 watts @ 8 ohms design using mj15003 and mj15004 ( do not trust my memory on this) but I used 9 driven by 1 on each rail of these devices.

I knew the dangers, but practiced safety and used a 25 amp variac.

IT worked then and I am going there again soon, I hope.

Dangerous? YES, doable YES, but so is driving down the street and going to a airport to climb on a plane to fly across an Ocean at night with one engine. THINK Lindbergh...

I encourage ALL to LIVE LIFE and BE CAREFUL....enjoy the results...
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Old 3rd August 2010, 01:40 PM   #124
Krisfr is offline Krisfr  United States
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Quote:
Originally Posted by ostripper View Post
TOTALLY wrong advice , those devices are as different as cars and trucks , night and day.

MR. SOA = "This is only a starting point, because we must have a safety margin. Remember that the peak dissipation into a reactive load with a 45 phase angle is almost double that calculated above, about 1900W. If the transistors can be maintained at 25C (not likely), that's fine, but we need to add more to allow for elevated temperature. I have elected to use 9 output devices, with a tenth device used as a driver. This maintains worst case peak dissipation at 212W - not much of a safety margin, but it should be ok in practice - in part because the supply voltage will collapse under load. "

quote from Rob elliot - ESP audio

This is not a toy amp , like DX original this is a BOMB!!
OS
Funny how we agree on number of devices, I wrote my post while you were posting yours and did not see your post first... Thanks
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Old 3rd August 2010, 01:50 PM   #125
Krisfr is offline Krisfr  United States
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The outputs transistors where MJ15024 and MJ15025 what ever 250 volt devices available at that time where. The total swing was 240 volts plus a little.....
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Old 3rd August 2010, 01:59 PM   #126
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Quote:
Originally Posted by Krisfr View Post
Having built and tested a design more than 20 years ago that had plus and minus 120 volt rails, I am finding it hard to understand what the danger is here.

Is it the DESIGN or the voltages being worked with?
Both ... this is a butchered linn topology amp using drivers in the voltage amp to avoid using a proper triple output stage. VERY crude.
It should have a low current precision VAS (6-8 Ma) with at least a capacitance multiplier for and a proven current stage (triple with MJL21193/4's or TO-3 devices)

The voltages are VERY lethal , I am more experienced than some but even I treat voltages as low as 77-0-77VDC (my amp) as I would a BOMB.

My issue is that a hobbyist's who do not know how to determine the suitability of transistor substitutes should not listen to someone who tells them all transistors are the same. Also , I would not suggest they even attempt to build a 1KW amplifier.
OS
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Old 3rd August 2010, 02:09 PM   #127
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Originally Posted by Krisfr View Post
The outputs transistors where MJ15024 and MJ15025 what ever 250 volt devices available at that time where. The total swing was 240 volts plus a little.....
Those are REAL output devices ... lower Ft as well (less prone to oscillation), the only plastic device I would even consider is the MJL21193/4 with over 2A Mr. SOA per device.
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Old 3rd August 2010, 02:23 PM   #128
AndrewT is online now AndrewT  Scotland
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Quote:
Originally Posted by Krisfr View Post
...................Is it the DESIGN or the voltages being worked with?
the proposal shown at the beginning of this thread is not a design.
It is little more than a cobbled together collection of circuits with almost random selection of components and values. Many of it's values are simply wrong, many of the devices are simply wrong.
The assembler of this proposal does not recognise how little they know and from such a lack of knowledge cannot even respond to suggestions for corrections/substitutions/replacements or simply to give up and accept the proposal cannot and should not be in the Forum.
It is irresponsible to promote this as a designed amplifier.
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Last edited by AndrewT; 3rd August 2010 at 02:33 PM.
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Old 3rd August 2010, 02:33 PM   #129
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Carlos, I -again- strongly advice to learn to accept criticism. To ALL parties, leaving the emotions out and stick to technical facts and figures will improve S/N and finally SOA.

/Hugo
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Old 3rd August 2010, 03:11 PM   #130
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I'll make it official:
Play the ball, not the man.

/Hugo

ostripper: please save your post and repost without the personal stuff. Your current post will be gone in five minutes.
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