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Old 10th June 2003, 07:59 PM   #1
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Default amplifier which uses MJ11032/MJ11033

Hi,

Does anybody have schematics of an amplifier which uses the MJ11032/33?

Other comments on the use of these transistors are welcome, too!
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Old 10th June 2003, 10:45 PM   #2
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those transistors are darlington 120v 50amp 300 watt puppies and are complimentary pair.....good for a decent amp

DIRT®
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Old 11th June 2003, 01:09 AM   #3
ted is offline ted
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The Marshall 3315 used a mj11015/mj11016.
Your mj11032/mj11033 are a little better in power and current
but likly a dropin based on the schematic.

http://www.drtube.com/schematics/mar...15-5150-pa.gif
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Old 11th June 2003, 02:14 AM   #4
djk is offline djk
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The MJ11032/33 have terrible SOA above 30V, and they are expensive.
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Old 11th June 2003, 07:38 AM   #5
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Quote:
Originally posted by djk
The MJ11032/33 have terrible SOA above 30V, and they are expensive.
Now I have also got some MJ21193/94. You mentioned them to be very good for amp purposes in an other thread.

Do you have a schematic for an amp with them either using +/-45V or +/-90V?
I know you described such a circuit to me, but I´d like a circuit which already has been built and works safely...or did you built the described circuit?
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Old 11th June 2003, 11:42 AM   #6
AJT is offline AJT  Philippines
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these power darlingtons are great, i used them as output for my leach superamps, i built two of them and the sound is just as good...as with the originals....
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Old 12th June 2003, 03:44 PM   #7
naldy is offline naldy  France
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I have couples of MJ11015/16 power darlington and I will be using it for my next project - the superleach amp. Do I need to change any values or just plug and play?

I'm currently building (60%done) my Rod's P3A with MJ15024/25 as OPT. Once done and working, I will change the OPTs to darlingtons - just for experiment.... bad idea???
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Old 13th June 2003, 06:29 AM   #8
djk is offline djk
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"Now I have also got some MJ21193/94. You mentioned them to be very good for amp purposes in an other thread.

Do you have a schematic for an amp with them either using +/-45V or +/-90V?
I know you described such a circuit to me, but I´d like a circuit which already has been built and works safely...or did you built the described circuit?"

The basic Leach design has been around for more than 25 years. You can run it as is from about ±40V~±70V.

The Super Leach has been around for more than 20 years. You can run it as is from about ±70V~±100V.

It is one of the best amplifiers I have ever heard. You do need to pay some attention to the quality of the parts, Leach discusses this in the construction notes.

The Crest 8000 is one of the most respected pro-sound amps made. If you look at the schematic it looks the same as the Super Leach, just more outputs and higher voltage.
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Old 13th June 2003, 08:10 AM   #9
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Quote:
Originally posted by djk

The basic Leach design has been around for more than 25 years. You can run it as is from about ±40V~±70V.

The Super Leach has been around for more than 20 years. You can run it as is from about ±70V~±100V.
Thanks for these circuits.
I probably will give it a try.

But output power doesn´t seem very high - for the basic Leach design a power rating of 120W/8Ohm by using +/-56V...You should get approx. 180W/8Ohm from such a power supply.

I couldn´t find any hints on using lower power supplies, e.g. with +/-45V which mine is - hopefully this isn´t too low for this design
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Old 13th June 2003, 09:52 AM   #10
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naldy,
if you want to use power darlingtons for the leach superamps, just omit the drivers for the output transistors and you should be fine...can you give me an idea of how much these power darlingtons cost? i can give minor modifications on the circuit if you want them.....in my case, i used the tip41c/tip42c transistors as replacement for the 2n34449/2n5412 transistors.....
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