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Old 10th August 2010, 10:37 AM   #1
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Default Monster amp :-)

Hello. I have a monster transformer, 2x40V 60A, weighs 15kg, and some huge cooling fins lying. Does anyone have an idea for an amp where it can be used? I mean, the transformer provides 2400W, and it will be a bit overkill to use it on something that provides 2x100W. This is normally the most expensive parts in an amplifier, so it might be the beginning of a spectacular project. Someone who has good ideas?
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Old 11th August 2010, 03:46 AM   #2
Jay is offline Jay  Indonesia
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With 2400W application, the transformer will not be the most expensive part. Yes, the transformer will be overkill to use for 2x100W. But for 2x1000W the speaker (or heat sinks), the transistors and worse the electricity bill will be overkill.

You can build a block of power supply where you can hook up 6 mono-blocks of class-A amplifiers for active crossover system. Cool... )
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Old 11th August 2010, 04:38 AM   #3
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Originally Posted by petter-p View Post
Hello. I have a monster transformer, 2x40V 60A, weighs 15kg, and some huge cooling fins lying. Does anyone have an idea for an amp where it can be used? I mean, the transformer provides 2400W, and it will be a bit overkill to use it on something that provides 2x100W. This is normally the most expensive parts in an amplifier, so it might be the beginning of a spectacular project. Someone who has good ideas?
My toriod , which is just 12kg , is rated for 1500KVA / 55-0-55VAC or about 1600w , it runs 2 -250 watt class AB amps just fine with about 1-2V peak ripple @ 100,000uf total capacitance. 2400W really is not overkill , although over-rated , you will have a "stiffer" power supply allowing for "crazy" peak power dissipation (headroom galore). Rectified ,you will have about 55-0-55VDC rails.

Your lower voltage would be nice for driving low impedance loudspeakers with a 6-8 pair OPS - MJL21193/4's. (400w/ 4R) Be warned, this power does not come cheap. My new amp to be used with this level of supply will cost me $171 .. that is only for 4 pair per channel , caps and all.
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Old 11th August 2010, 04:40 AM   #4
tinitus is offline tinitus  Europe
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Originally Posted by petter-p View Post
Hello. I have a monster transformer, 2x40V 60A, ............... provides 2400W,
2x 40V/60A usually means 60A each secondary
thats 2x 2400watt = 4800watt
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Old 11th August 2010, 04:57 AM   #5
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Originally Posted by tinitus View Post
2x 40V/60A usually means 60A each secondary
thats 2x 2400watt = 4800watt
I have a hard time believing that level of amperage. @ 12kg my toriod is truely rated for about 15A per secondary. At only 3kg more ,120A and 4800w is unrealistic , even at the lower voltages.

The biggest 40-0-40VAC antek toriod at 30lbs (13.6Kg)..
Antek - AN-15440
is only rated at 18.8A per secondary.

Is this trafo a EI or a toriod , BTW ??
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Old 11th August 2010, 09:48 AM   #6
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Well. I just have to believe what is written on the label. It is a transformer that I have picked out of a scrapped battery charger. The charger was 24V 50A. It is a Toroid

I go away for a few days. I can post some pictures when I'm home again.
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Old 15th August 2010, 11:11 PM   #7
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Back again. Well, the transformer is not in 60A, but 58A. It weighs 14.9 kg.

The point is not how large and heavy transformer is, but what kind of amp it is useful to. I have seen many good amplifier projects here, but most will have a voltage of 2x50V and up. Just for fun, just to see what is possible. It could be a future project.
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Old 15th August 2010, 11:59 PM   #8
wahab is online now wahab  Algeria
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Originally Posted by petter-p View Post
Back again. Well, the transformer is not in 60A, but 58A. It weighs 14.9 kg.

The point is not how large and heavy transformer is, but what kind of amp it is useful to. I have seen many good amplifier projects here, but most will have a voltage of 2x50V and up. Just for fun, just to see what is possible. It could be a future project.
The two secondaries are connected in paralele mode..
So it s surely a 2 X 40V 29A transfo, i.e, 58A as connected.
Still, an impressive toroid...

Perfect with four amps bridged by pairs...
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Old 16th August 2010, 12:19 AM   #9
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Perfect with four amps bridged by pairs...
Some good suggestions about what kind of amplifiers that can be Bridged?
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Old 16th August 2010, 01:49 AM   #10
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Some good suggestions about what kind of amplifiers that can be Bridged?
Ones that have MANY output pairs (BJT). MOSFET output stage would be perfect to unleash that kind of amperage onto the world.
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