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Old 5th February 2007, 09:29 PM   #1
K-amps is offline K-amps  United States
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Default What Toroid in Mackie M1400

I just picked up a Toroid for a Mackie M1400. Does anyone know what VA rating it is?

Mackie says it is a 250wpc RMS into 8 ohmpower amp, but it has a +/- 90vdc tap... With that you could design a 350 watter... Does the Mackie use MOSFET's? Why such low OP rating?

It does have dual supplies i.e. 65-60-0-60-65vac so either it is MOSFET with the higher supply feeding the inputs/Drivers and the lower feeding the OP stage... or a Class-H BJT design... which is it?


regardless, whats the VA of it's Toroid, anyone know?

K-thanks!
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Old 5th February 2007, 09:59 PM   #2
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Hi,

Visit
http://www.eserviceinfo.com/download...kie_M1400.html
for schematic. That's not a mosfet amp. Uses the popular Onsemi MJL BJT parts.

And this page for output powers of the amp: http://www.mackie.com/products/m1400/

Here
http://cgi.ebay.com/TOROIDAL-POWER-T...QQcmdZViewItem
the xformer looks me to small for an 1400W amp...
Measures about 13*5cm's... That means 300-400VA transformer...

Regards
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Old 6th February 2007, 01:37 PM   #3
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Thanks but the service manula link does nothing, i get to a page where there is no link to download the file.

Can you email it to me?

Thanks.
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Old 6th February 2007, 03:08 PM   #4
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Just scroll down a little. The word 'Download' points to the link. Twice!
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Old 6th February 2007, 03:35 PM   #5
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Yup... I am growing too old...

By the way, do you guys think the 65vac tap on the Toroid, is high current enough to be used with an OP stage?

i.e. is it a piggy back from the 60vac tap with the same gauge wire?
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Old 6th February 2007, 03:47 PM   #6
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If the amp is rated at 250w into 8 ohms then with the common 4 ohm load it could be upto 500w, which would tally up with the number of output devices employed.

Only you with the toroid in front of you can determine if the wire gauge of the higher volt winding is thick enough.
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Old 6th February 2007, 03:53 PM   #7
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True: But I wanted to have that determination made before I bought 4 of them. I do not have posession of any one right now.
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Old 6th February 2007, 05:39 PM   #8
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Wildly guessing from the schematic, it's likely not the same gauge.

In the PSU section, the 90V rails are stacked on top of the 80V rails with 25V capacitors (and not smoothed with reference to ground separately). This was done because cost was an issue. If quality was the main concern, the 90V rails would have gotten 100V capacitors to ground.

If they skimp on the second most expensive part in the PSU, why not on the most expensive? We're talking "the new" Mackie, after all...

I could be wrong, though.

Cheers.
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Old 6th February 2007, 06:04 PM   #9
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Actually then I would speculate that it IS the same gauge wire. As it's a lot easier, quicker and cheaper to wind a few extra turns onto the end of a winding than do a whole new one even with thinner wire.

To be honest with the windings as they are and assuming the worst about wire gauge, it's a useful transformer anyway - the higher voltage pre stage is a good way to gain a bit better efficiency.
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Old 6th February 2007, 06:25 PM   #10
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Why is it easier? Primary and secondary windings are already of different gauge, so changing wire (or rather winding rig) between windings is not an issue. But cost, weight and size are.

And I didn't intend to say the transformer is actually bad.
I just said that cost is a higher issue in this amplifier design (as it always is in the professional world!).

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