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Old 15th December 2011, 08:39 AM   #11
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Default So, it is the same MKIII Hx made in small power version

Economic version, to save your money, to use the power transformer you have, to update and upgrade a former amplifier.... adjusted to use smaller voltage, using a single pair in the output or using two pairs...this completes the line of MKIII Hx.

The MKIII Hx, the high power unit, can operate with several different voltages from 4.5 plus 4.5 volts till 70 plus 70 volts without modifications...but.... have to use the long and big board offered.... several transistors...if you do not install them the board looks that something was missed there...ugly solution.... then i have made a smaller version and asked folks to offer pcboard layout, Alex mm did it for us...now you have another option that was adjusted (currents) to work with lower voltage and can use my prefered transistors (BD139/140) as drivers and VAS.

These transistors operates fine from 20 to 40 volts supplies...it seems it works better with 30 volts supplies.... i do think they are unbeatable...the best units i have assembled have used these folks....i do not think they sound better....i do think they are more linear at this range of frequency.

These transistors are being used by Brazilian industry (and European industry too) since the seventies.... a general use transistor, more dedicated to audio amplifiers.... it was the main substitution transistors to VAS and driver position to imported amplifiers along a couple of decades.... reliable, something you can trust... they are cousin of MJE340/350 but they do not oscilate the same way...they are more stable than MJE340/350... also they where made to lower supply voltages.

Dx Blame MKIII - Hx, home unit ready - YouTube

regards,

Carlos
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Dx Blame ST with a tube preamp. recorded with Xperia cell phone, https://www.youtube.com/watch?v=Qjs32J0gdj0; https://www.youtube.com/watch?v=nhrZ...vDnDhEpNv_XVxg
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Old 15th December 2011, 11:06 AM   #12
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Default We have layout.... this turns our life easier

I will eat the amplifier if someone say that is not satisfied with sonics.

But first, in advance, the guy must prove he is not crazy or have any kind of brain damage, or deaf, or retarded.... a registered Psychologist or Psychiatrist document is enough (Mental health).

About ears i will ask a Doctor of hearing, (ENT or Otorrinolaringologista) document too.

If they guy bring me these documents...even this way i will be thinking he use to drink too much.

regards,

Carlos
Attached Images
File Type: jpg We have layout.jpg (390.9 KB, 413 views)
File Type: jpg Retarded.jpg (77.1 KB, 400 views)
File Type: jpg Or a drunk guy.jpg (160.1 KB, 403 views)
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Dx Blame ST with a tube preamp. recorded with Xperia cell phone, https://www.youtube.com/watch?v=Qjs32J0gdj0; https://www.youtube.com/watch?v=nhrZ...vDnDhEpNv_XVxg

Last edited by destroyer X; 15th December 2011 at 11:22 AM.
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Old 15th December 2011, 01:30 PM   #13
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Great! a "civilized" edition compared to the full blown Hx It's rather tempting to build this one as well.

My first observations are:
- No lifted ground anymore?
- The CCS seems to be running with a low current, so no need for a heatsink?
- The power transistors, is it possible to make them perpendicular to the board, just like the original Hx was? Or at least remove the traces behind them so both options are available.
- The same approach is used for the board and components will be pretty much all crammed together. Is it possible to make it larger? I foresee the same problems we got with the Hx: very "close to the other" solder pads; heatsink so tight that shorts are possible; output inductance squeezed... Let components breathe! Are the hole sizes reviewed?

I guess I'll raise my hand for a group buy!
Martin.
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Old 15th December 2011, 02:41 PM   #14
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... sorry wrong button.
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Old 16th December 2011, 12:55 PM   #15
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Carlos,
Can we reach 100Watts/8 ohm with 3 pairs output trannies.I would like that very much.
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Old 16th December 2011, 06:56 PM   #16
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Default Group buy + extras

I'm not any good at making circuit boards nor do I want to go thru the process. So I would like to see a proven thought out board with a group buy. I would also recommend making a few extra for the people to find this amp a couple months later..... I missed out on HX-III Super Charged and keep hoping to get some boards some day....
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Old 16th December 2011, 06:58 PM   #17
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Default More than a hundred Meanman.... all depends your supply

3 pairs will be enough.

2 pairs can hold 100 watts in a very confortable way.

Your amplifier is able to put out (MKIII Hx) much more than that in 8 ohms.

These ones shown, the small brothers, these new editions; the MKIII Hx - Home Edition and the MKIII Hx - Mini Edition (called Hx Home Edition and Hx Mini Edition) will give other range of power because other voltages in the supply, they are different from the MKIII Hx because of that... reduced versions.

Thes amplifiers use 2 pairs to the Home Edition (100 watts/ 8 ohms) and one pair to the Mini Edition... this last one, the Mini, use a single pair and the supply voltage is smaller..as a consequence the power is smaller too.

regards,

Carlos
__________________
Dx Blame ST with a tube preamp. recorded with Xperia cell phone, https://www.youtube.com/watch?v=Qjs32J0gdj0; https://www.youtube.com/watch?v=nhrZ...vDnDhEpNv_XVxg

Last edited by destroyer X; 16th December 2011 at 07:00 PM.
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Old 16th December 2011, 09:44 PM   #18
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Quote:
Originally Posted by crispycircuit View Post
I'm not any good at making circuit boards nor do I want to go thru the process. So I would like to see a proven thought out board with a group buy. I would also recommend making a few extra for the people to find this amp a couple months later..... I missed out on HX-III Super Charged and keep hoping to get some boards some day....
About the MKIII-HX high power still working on it.I'm trying some ideas and when I'm happy with the results it goes to Carlos for checking.
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Old 16th December 2011, 11:08 PM   #19
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Default Will be a great pleasure to see your work dear Patrick

I am waiting to see....new boards, new ideas, to the next year...MKIII Hx is too much fresh... people is still building...we must wait them do and the dust gonna come down and then we gonna start to make modifications.

You see that Alex mm already made a pcboard layout removing the vertical transistors that now are connected to the main heatsink....so.... we gonna try different ideas and new layouts too.

First we must know forum people interest to a group buy second round to next year..the we can study deeply new ideas.... board from Alex is fine...i will love to see yours too.

Alex board, with the modification is here for you all to see.... we are working... alex mm is always watching forum and following thread's progress.... the man is alike a oiled machine..works fast and softly... the only thing that slow the man is a flu.

regards,

Carlos
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File Type: jpg DX MK III REV 2.2 ALL COLOR.jpg (891.2 KB, 366 views)
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Dx Blame ST with a tube preamp. recorded with Xperia cell phone, https://www.youtube.com/watch?v=Qjs32J0gdj0; https://www.youtube.com/watch?v=nhrZ...vDnDhEpNv_XVxg
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Old 17th December 2011, 10:25 AM   #20
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by meanman1964 View Post
Carlos,
Can we reach 100Watts/8 ohm with 3 pairs output trannies.I would like that very much.
The very rough method I use for determining output stage specification relative to power is

Max output power ~ total Pmax of output devices / 5 or 6, for BJTs
Divide by 4 for FETs, (less affected by second breakdown, but not immune).

eg, 3pair of 1943/5200 is 6 * 150 =900W of Pmax.
Max output power is ~ 900/5 to 900/6, i.e. 150W to 180W
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