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Old 19th April 2011, 10:42 PM   #1
NYCOne is offline NYCOne  United States
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Default Suggestions for SemiSouth R100s

I'm getting a set of Semi South R100s (four) and I'm seeking suggestions for amps. It seems like folks have had the best outcome with the Aleph J. The J2 is intriguing, but the designs floating around seem immature.

What have folks been most satisfied with?
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Old 19th April 2011, 10:49 PM   #2
Zen Mod is offline Zen Mod  Serbia
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well

I tried them in J , but J2 is better ...... even if bastard between these two should certainly have own merits

I presume my , still untested , Big Donut amp is interesting ...... but I'm biased
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Old 20th April 2011, 04:47 AM   #3
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You can pretty much put R100's as a drop in for N ch mosfets, keeping in mind the differences in Vgs values, which are on the order of a volt and a half.

You should expect lower distortion and wider bandwidth without any effort.

Keep in mind that there are some DC gate currents on the order of 10 microamps or so, and you should confirm the value If the source impedance is high.

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Old 20th April 2011, 08:22 AM   #4
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Default Aleph JX experience

I'm sure folks have tried the Semi Souths in an Aleph JX. Can I elicit opinions on the outcome vs the stock Aleph JX, Aleph J?
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Old 20th April 2011, 02:09 PM   #5
qusp is offline qusp  Australia
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well i intend on trying it with jx, but from what i gather some more drive is needed from the input stage when using them. anyone care to offer a solution? is it as simple as paralleling more fuses and using little heatsinks? finding the illusive j109v?
or must we keep jx rather than jjx by using a different device like small mosfet or bipolar (or little linear tech ref) and losing mosfet for r100? these are things i intend to find out, but i also would like to hear from those who have tried it.
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Old 20th April 2011, 02:35 PM   #6
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Quote:
Originally Posted by Nelson Pass View Post
You can pretty much put R100's as a drop in for N ch mosfets, keeping in mind the differences in Vgs values, which are on the order of a volt and a half.

You should expect lower distortion and wider bandwidth without any effort.

Keep in mind that there are some DC gate currents on the order of 10 microamps or so, and you should confirm the value If the source impedance is high.

Do the SS jfets have a different sonic signature than the mfets. I know there is a different sound, but is this a result of lower distorion or is it a combination of lower distortion and all together different sound. Kind of like different kt88 tubes.

Last edited by buzzforb; 20th April 2011 at 02:55 PM.
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Old 20th April 2011, 05:49 PM   #7
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Old 20th April 2011, 10:27 PM   #8
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Quote:
Originally Posted by buzzforb View Post
Do the SS jfets have a different sonic signature than the mfets. I know there is a different sound, but is this a result of lower distortion or is it a combination of lower distortion and all together different sound. Kind of like different kt88 tubes.
When I get lower distortion out of a part I tend to use it as
an excuse for less feedback, so the net result is often not
less measured distortion.

I like the sound of the Jfets - it's more relaxed and organic
in quality, and of course this reflects my taste. If I listened
to punk or metal, or if I am watching TV or driving the car,
then these things wouldn't be important.

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Old 20th April 2011, 10:34 PM   #9
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Quote:
Originally Posted by Nelson Pass View Post
When I get lower distortion out of a part I tend to use it as
an excuse for less feedback, so the net result is often not
less measured distortion.

I like the sound of the Jfets - it's more relaxed and organic
in quality, and of course this reflects my taste. If I listened
to punk or metal, or if I am watching TV or driving the car,
then these things wouldn't be important.

THanks.
Needed an good explanation for my wife to buy 6 of them to put in my 3 pair AJ mono blocks. As if they aren't good enough..... I think i may have a problem.
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Old 20th April 2011, 10:38 PM   #10
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