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Project for Semisouth R100A and 085
Project for Semisouth R100A and 085
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Old 3rd January 2018, 05:32 PM   #1
316a is offline 316a  England
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Default Project for Semisouth R100A and 085

I have a pair of each and was thinking that I should really put these rather expensive parts to use . What springs to mind is a Zen type amp with R100A underneath a R085 top load .

May I hear tour suggestions , please?



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Old 3rd January 2018, 05:33 PM   #2
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Project for Semisouth R100A and 085
SJEP or SJDP ?
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Old 6th January 2018, 07:32 PM   #3
316a is offline 316a  England
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The parts I have are

SJDP120R085
SJEP120R100A

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Old 6th January 2018, 07:43 PM   #4
dady is offline dady  Balearic Islands
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Send a message via MSN to dady Project for Semisouth R100A and 085
Are they different between them?
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Old 6th January 2018, 08:43 PM   #5
Nelson Pass is offline Nelson Pass  United States
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Project for Semisouth R100A and 085
Different enough. The DP is a depletion mode part which typically has
Vgs voltage at -3 to -5V, and the EP is enhancement mode at about +1 to
+2V.

After that, they are somewhat similar.

The DEF amps discussed elsewhere in this forum used the R085's for the
depletion mode device.
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Old 6th January 2018, 08:45 PM   #6
Nelson Pass is offline Nelson Pass  United States
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Project for Semisouth R100A and 085
Quote:
Originally Posted by 316a View Post
What springs to mind is a Zen type amp with R100A underneath a R085 top load .
Maybe R100 follower with R085 self biased current source,

or

R100 operated Common Source mode like in J2 with R085 on the top as
mu follower.
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Old 6th January 2018, 08:45 PM   #7
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Project for Semisouth R100A and 085
with pair of SJEP , say Aleph Jango (Aleph J iteration , one of Most Greedy Boyz made by Papa's hints)
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Old 6th January 2018, 08:48 PM   #8
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Project for Semisouth R100A and 085
with pair of SJDP , maybe DEF amp , even if that one is for more faint in heart , needing lesser amount of watts and more romance



you can always send them in OPLDF , for proper treatment

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Old 6th January 2018, 09:04 PM   #9
316a is offline 316a  England
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Quote:
Originally Posted by Nelson Pass View Post
R100 operated Common Source mode like in J2 with R085 on the top as
mu follower.
That's the sort of thing I was thinking of . For this project I intend to only purchase the heatsinks and output capacitors and really splurge out using some of the parts from 'the mountain' .

It will be built on a piece of wood and be a perpetual prototype so almost anything goes I have 97dB sensitive speakers (15"+TPL150H) so only need a clean watt .

The J2 thread is a beast . Is there a go-to post that has a schematic or can you share something ?

What about the Amp Camp Amp with Semisouth devices top and bottom ?

Thanks to all who responded

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Old 6th January 2018, 09:24 PM   #10
res07njc is offline res07njc  United States
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I was going to say use the R100 in an ACA, adjust for lower Vgs of the R100 as some have done previously with a 1 pair aleph mini (you can search DIYA, member "teabag" even made an article), except with ACA mu follower as irfp240.. and maybe use the 085 for something else.. (obviously that DEF amp).
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