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Old 6th December 2017, 05:34 PM   #371
marconi118 is offline marconi118  Germany
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Quote:
Originally Posted by Zen Mod View Post
done zillion times

Iron Pumpkin is pretty much exactly that , two buffers driving autoformer ....... common mode choke , center tapped choke , call it however you want
Any link or schema of it ?
Cant' find any
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Old 6th December 2017, 05:47 PM   #372
Ralph G is offline Ralph G  Netherlands
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Zenmod his own website.
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Old 6th December 2017, 05:55 PM   #373
Zen Mod is offline Zen Mod  Serbia
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I believe that's schematic of Magura's Big Donut amp

sort of "see what I have , correct that for me " schematic ....... few bits and pieces I would do differently nowadays , but there was some sweet music .......
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Old 7th December 2017, 07:50 AM   #374
Ralph G is offline Ralph G  Netherlands
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Click the image to open in full size.

or

Click the image to open in full size.

The whole article from John Broskie:
index

I wanted to go this route. But I was advised to use rather big transformers (to get enough inductance and a low resistance). This is also expensive. Plus you will need to adjust the whole system to a nicely balanced current (as written in ZV7). I don't have this equipment.

So in the end I was lazy and bought a Hammond 159ZC. No regrets.
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Old 7th December 2017, 09:47 AM   #375
Zen Mod is offline Zen Mod  Serbia
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search for Zeus amp here
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Old 7th December 2017, 12:05 PM   #376
xrk971 is offline xrk971  United States
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Yes, I have always liked that Zeus design by Susan Parker. The custom trafos however are hard to get past. Would love to hear that driven with the Aksa Lender pre.

Zero Feedback Impedance Amplifiers

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Zero Feedback Transformer Audio Power Amplifier - About

This is interesting though. Use of standard toroidal power trafos for output instead of custom audio trafos.

Zeus Amp - Toroid Transformer Version
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Last edited by xrk971; 7th December 2017 at 12:30 PM.
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Old 7th December 2017, 12:46 PM   #377
Ralph G is offline Ralph G  Netherlands
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In the Broskie article is this Zeus amp also mentioned. The special transformers scared me off.

The two schematics I've copied, use normal "choke" like transformers. Easier to get.
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Old 7th December 2017, 01:33 PM   #378
marconi118 is offline marconi118  Germany
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zeus with only double choke (toroidal double primary) at the output

no transformer at the input, bias and driving la MoFo
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Old 7th December 2017, 01:42 PM   #379
Ralph G is offline Ralph G  Netherlands
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Quote:
Originally Posted by marconi118 View Post
zeus with only double choke (toroidal double primary) at the output

no transformer at the input, bias and driving la MoFo
I would go for a transformer and use the double secondaries (lower resistance). I think the Zeus does this too.

And use a transformer at the input and bias a la F6. You can drive it SE or balanced with this.

Of course you don't have a lot of MoFo left......
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Old 7th December 2017, 01:46 PM   #380
Zen Mod is offline Zen Mod  Serbia
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same

as

Buddha

everywhere

is

MoFo


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