Tea-Bag's IXYS Depletion Mosfet Group and SemiSouth R100 JFET group buy. - Page 2 - diyAudio
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Old 17th February 2010, 12:58 PM   #11
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I'm quite confused:

Magura made the semisouth group buy, we still have to wait, now there will be another group buy for semisouth devices???

Shouldn't we put the semisouth devices to magura, because the higher the numbers of devices, the lower our prices????

Regs, Dirk
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Old 17th February 2010, 01:12 PM   #12
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dirk - One word: Paypal.

Magura's GB was bank transfer only, and left a number of us out in the cold.
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Old 17th February 2010, 01:28 PM   #13
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His GB is closed as well.
Just trying to help people get strange output devices at a reasonable cost.
Well reasonable is subjective here with the SiC Jfets
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Old 18th February 2010, 05:03 PM   #14
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Current status report, looking for 50 pairs of each about to close GB.

SemiSouth IXTH50 IXTH65

pairs 23 20 29

Looking good I would say. Although those darn 50's come in 30 packs. Guess I will have to figure that out.
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Old 20th February 2010, 09:48 PM   #15
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Default F2 with SS.

I was inspired by another member to try these on the F2.
Poped it in, needed to pump up the bias. It dropped down about 4v. The sound is different, have not gotten around to analyzing it yet. Listened to my Fostex FF85ks. It seems to be a 'cleaner' sounding F2.
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File Type: jpg f2SS.jpg (167.2 KB, 780 views)
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Last edited by Tea-Bag; 20th February 2010 at 09:49 PM. Reason: forgot pic
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Old 21st February 2010, 07:04 AM   #16
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Question power jfet amps

I noted in another thread, possibly too old now, that i had ordered a half dozen Lovoltech power jfets from ebay source for only a few dollars. I have some tiny tube amps in low voltage space charge mode operation, I intend to interface to it. But, can anyone tell me, source of explicit power jfet circuits, rather than circuits which suggest that power jfets could be used? For example something similar to the De Lite amp, but using power jfets? I myself decided to stick to space charge tubes and jfets, no high voltages for this hobbyist Thanks
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Old 21st February 2010, 05:28 PM   #17
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Zen version 8 on the passdiy.com site is just what you're looking for.

Measures better than the De-Lite too.
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Old 21st February 2010, 06:22 PM   #18
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Check out this section of the DeLite article.
If you can substitute a IRFP240, you can use the SemiSouth as well.

De-Lite Amplifier
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Old 22nd February 2010, 07:59 PM   #19
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Hi Tea-Bag,

Thanks for your time and your help. I hope i am not not too late for joining the group buy, i did it a couple of minutes ago. Paypal seems just fine !

Dominique
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Old 23rd February 2010, 05:29 PM   #20
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No one is too late yet. We have met the pricing mark for the 65N Depletion Fets. Just need to gain some momentum on the SouthSemi JFets. They are pricey little critters, so I can understand the hesitation. As soon as we get close with the JFET's I will close the group buy with ~ 7-10 days to pay.

Papa did share the F2 Clone changes on that thread.

http://www.diyaudio.com/forums/pass-...-new-post.html

Here is the message that has just been posted:
***************

The F2's that I have updated with the JFETs need the
following changes:

R6 = 47k

C1 = 10 uF

Z1 removed

The potentiometer must be re-adjusted for minimum
distortion at 4.5 watts (symmetric clipping) and readjusted
after an hour.

The distortion results are typically a reduction from about 1%
at 1 watt to .3% at 1 watt


_____
So I am populating what I can on my PD F2 boards. I will salvage most the existing F2 parts. Getting ready to hear the first 'available' SouthSemi Papa approved design.

Wish I had a bunch of 1000uf Elna Silmic's for the output.
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