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Old 25th March 2013, 09:02 AM   #1
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Default Arch Nemesis - High voltage version

Hi,

I was just looking around at the Arch Nemesis amplifier.

I am aware of the thread of this article, however it seems that the biggest challenge is the transformer will have to be made out of a core of unobtanium and wires of expensium. Normal transformers for SETs would not do due to the wrong DC current ratings and turnings.

I wonder if anybody has ever sucessfully built a high voltage, low current version based on normal SET transformers?

My guess is the semisouth part other than having gone in the way of the DoDo is also less suited for low current performance. The current of a few tens of mA would put Vgs pretty much at Vt, which is not where it would like to be.

I was wondering if there is anybody out there who has sucessfully implemented a high voltage low current Nemesis like circuit using a normal SET transformer...

Oon
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Old 25th March 2013, 09:16 AM   #2
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I'm not aware of it, but it's an interesting idea, worth pursuing.

jan
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Old 25th March 2013, 11:07 AM   #3
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Possibly the R550 would be more suited to your idea? Or maybe some of those expensive RF devices.
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Old 25th March 2013, 11:55 AM   #4
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This may have some useful information :
"SiC Puppy SE Amp Using Semisouth 085 JFET
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Old 25th March 2013, 01:07 PM   #5
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Hey Kasey,

Looks interesting. Too bad the semisouth has gone the way of the Dodo, even if you can get the circuit to work decently, still have to substitute the transistor.

I was thinking of something hare brained... putting about 40 of these in parallel.

http://sg.element14.com/diodes-inc/z...line/dp/259718

Back to transistors...

But it is still castle in the air. But it is good to know somebody got the semisouth to work...

Oon
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Old 25th March 2013, 04:54 PM   #6
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That sure is a funcky part???
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Old 25th March 2013, 04:59 PM   #7
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Try to find some of the HF SiTs. I searched but ??? I know I've seen some that look good but don't have the current capability of an output part. Can't remember where I saw these things. Maybe the Sic threads??? The ZV9/F3 threads??? There are some nice parts for RF that you might be interested in but I can't find 'em myself now
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Old 25th March 2013, 05:57 PM   #8
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flg, search for threads by member "vladimirk". I think I saw a SIT amp schem based on SIT used for radar. Hope I didn't dream that, but I think that's what it was based on.
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Old 25th March 2013, 06:04 PM   #9
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SIT amp idea
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Old 26th March 2013, 12:32 AM   #10
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I was thinking off the old type of circuit. Something like this. Look under transformer coupled.

http://www.electronics-tutorials.ws/...ier/amp_5.html

I was thinking of using 50 pcs of the transistor to replace the main transistor. The resistor at the emitter will be about 1k. The will have 1mA through each of them running a power supply of about 300V.

It will only be single stage.

Any thoughts on that...?


Oon
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