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Old 17th August 2011, 12:09 AM   #31
kevinh is offline kevinh  United States
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On the Semisouth site they have a couple of devices identified as being for audio use:

SJEP120R100A & SJEP120R063A The specs seem the same as for the devices without the audio designation.

Are the devices in the 6 moons article different from these FETs?
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Old 17th August 2011, 12:34 AM   #32
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Yes. The ones in the article were made for Nelson, I believe.
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Old 17th August 2011, 01:09 AM   #33
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Quote:
Originally Posted by wrenchone View Post
Interesting. Have you compared curves?
Thumb-nailing the performance, they are pretty comparable in gain and
distortion for single-ended Class A in the 10 watt category. The 2SK77
has a bigger die and more capacitance, which is both an advantage and
disadvantage, depending on what you are looking for. Certainly that is
an advantage for higher power, not an advantage for single-stage amps.

A very nice part, though.

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Old 23rd August 2011, 08:22 PM   #34
Blues is offline Blues  United States
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Page 4 is up...http://www.6moons.com/audioreviews/f...4.html...looks like another exciting FW model to look forward to!
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Old 23rd August 2011, 08:32 PM   #35
Zen Mod is offline Zen Mod  Serbia
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naah ......

just go to first page , and read again :

6moons audio reviews: Nelson Pass' NewWatt
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Old 23rd August 2011, 09:45 PM   #36
Blues is offline Blues  United States
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Sorry can't edit anymore, this is the correct link... 6moons audio reviews: Nelson Pass' NewWatt

ZM, naah can't afford those...I'm NP so an FW product will come of it...
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Old 23rd August 2011, 09:58 PM   #37
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Thanks, I had not seen the latest.

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Old 24th August 2011, 04:07 AM   #38
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I'm curious - what sort of topology was used for this part to make manifest its character? I'm not asking for the schematic, mind you - just a broad-brush description of topology, From the 6 Moons pictures, there appears to be not a whole lot going on. I would guess a simple SIT stage with active loading. I may guess wrong...
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Old 24th August 2011, 05:35 AM   #39
Zen Mod is offline Zen Mod  Serbia
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Quote:
Okay, you've had your initial impression so here's the poop. 10 watts/ch into 8 ohms. 47Kohm input impedance, damping factor of about 3, bandwidth is 1Hz to 300KHz. Gain is 19dB. The distortion is 2nd harmonic at about 0.5% at 1 watt and a mix of 2nd and 3rd at about 4% at 10 watts. The amplifier circuit has a single stage consisting of the SIT biased by a Jfet set up as a mu follower. There is no feedback loop and the SIT has no degeneration. It draws slightly less than 200 watts. I hope you are enjoying it! - np
there is it ....

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Old 24th August 2011, 06:02 AM   #40
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I stand chastened... I went back to the 6 Moons review and bored back through it, managing to find the tidbit quoted above. Food for thought, anyway.

I'm SIT-less at present, but the simple topology mentioned could possibly be duplicated with a pair of Ixys depletion mode fets or an Ixys fet plus Semisouth 085 (or a pair of Semisouths, if you're feeling flush). It wouldn't likely have the same characteristics as Nelson's SIT amp but it would have [U]some sort of characteristic[/U], perhaps worth looking into.... A nudge, perhaps, to turn loose of papa's coat-tails for a bit (admitting freely that they're rewarding coat-tails) and forge off on one's own tangent. Even though the results might not be as quite as nice, they may still be pretty good.
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