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Old 2nd March 2005, 08:54 PM   #11
jleaman is offline jleaman  Belgium
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Maybe we could ask jen's to do so : O ) and see if any one else agree's or wants that version instead ...
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Old 3rd March 2005, 06:09 AM   #12
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I go to work this evening

I guess it will only take an hour or so to make the data ready.

Are PDFs ok to start with?

\Jens
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Old 3rd March 2005, 06:40 AM   #13
rodolfo is offline rodolfo  Mexico
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Quote:
Originally posted by jleaman
So is any one interested ?
I interested too
please
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Old 3rd March 2005, 10:17 AM   #14
IlyaMK is offline IlyaMK  Russian Federation
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I'll take at least 2, depending on the price
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Old 3rd March 2005, 10:57 AM   #15
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You may look at the power capabillity of output stages compared to rated power in 8 ohm of commercial amplifiers.
I did that, (did it way too long, actually), i like numbers.

Most commercial amplifiers have a 4 to 6 ratio, only the very pricy ones go deep.
ML at 12 with class AB amps.
To me it makes more sense too to build an amplifier with abundant output devices, such an amplifier can drive more uncommon speakers.
More important, Class A bias can be set a lot higher, i think any decent amplifier should go 5 watts class A minimum.

But, if you think 10 is OK for the extended Leach, then 4 is OK for this one.
53 Volts will deliver between 100 and 125 in 8.
With regular 150W output devices as the 1302/3281 you have a ratio of 4.8 to 6.
Go for the 230 watt MJL's Jens mentioned on the extended leach thread and the numbers are like 7.4 - 9.2
For a commercial amplifier that would be really impressive output stage numbers.

The Toshiba's i am going to use for Jens's extended Leach boards were used in the +$15.000 Luxman M07.
I have 50 of them, if i am not content with 10 in parallel i will need to buy Delta-Audio extension boards.
The M07 used 6 of those devices for a nominal 100w/8, and had a large portion class A use.
The M07 was the successor of the very succesfull Luxman M05.
Dieter Burmester used 8 per channel in his 850 mono amplifiers, but that were fully symmetrical amps.(and pricy)

i know, i am crazy.
I am out of here, i've got no business on this thread.
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Old 3rd March 2005, 03:03 PM   #16
LOEP is offline LOEP  Netherlands
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Default 4-6-10 transistors

Hi Jens, in this thread :redesign of leach amp pcb for integrated TO-247 output devices, post 130 you placed a design what is my preferred design( because it fits on my heatsink.)
Here you made a little more space between the driver and power stage.
But I will wait and see what is coming out the smaller discussion.
Greetings, Loek
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Old 3rd March 2005, 04:55 PM   #17
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Loek,

I decided that I needed 40mm in diameter for the on board caps.
This meant that the spacing between drivers had to be smaller.

\Jens
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Old 3rd March 2005, 05:12 PM   #18
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Default 6 transistor version

See if you like this

\Jens
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File Type: gif leach ver 5.9.6.gif (34.9 KB, 5041 views)
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Old 3rd March 2005, 05:20 PM   #19
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If you wanted to go a little overboard you could use 3 pairs per channel. Bryston gets 150W into 8ohms and 200 into 4ohms with 2 pairs of plastic case MJL 21193/94 transistors.
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Old 3rd March 2005, 07:25 PM   #20
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It could be these old eyes, but it looks like he has 3 pair in that last pic.

Blessings, Terry
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