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Old 30th June 2011, 06:59 PM   #1
JZatopa is offline JZatopa  United States
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Default Semisouth power jfet question

Ok two questions.

1. Since these are high V devices could you just drop them in place of a tube in a tube amp? I am sure that you would have to tweek a few things but would it work or would it be a major overhaul of a circuit and not worth the time.

2. Could I replace my IRFP240 and IRFP9240 with SJEP120R100 and SJEP120R100A or SJEP120R063 and SJEP120R063 in my F5 amp? If so I think that power jfets may be the next evolution in audio since solid state.
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Old 30th June 2011, 07:12 PM   #2
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no

no


horses for courses ; in first case - major overhaul - different OPT is needed for SS instead of tube

in second case - F5 is made with complementary devices , and you don't have complementary SS-es
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Old 30th June 2011, 07:28 PM   #3
JZatopa is offline JZatopa  United States
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SJEP120R100 and SJEP120R100a aren't complimentary?
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Old 30th June 2011, 07:57 PM   #4
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nope
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Old 30th June 2011, 07:59 PM   #5
JZatopa is offline JZatopa  United States
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disappointing.

Whats the difference between SJEP120R100 and SJEP120R100A and a regular complimentary pair?
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Old 30th June 2011, 08:36 PM   #6
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rephrase question

writing War & Peace isn't exactly purpose of public forum

edit :

main difference with these two is that they aren't complimentary pair , at all
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Old 30th June 2011, 08:50 PM   #7
qusp is offline qusp  Australia
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Quote:
Originally Posted by DJNUBZ View Post
disappointing.

Whats the difference between SJEP120R100 and SJEP120R100A and a regular complimentary pair?
everything, they arent complimentary
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Old 1st July 2011, 12:47 AM   #8
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The SemiSouth Jfets are N channel parts only. I am unaware of a
company making complementary (N and P channel) power Jfets since
Sony in the 70's.

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Old 1st July 2011, 02:48 PM   #9
JZatopa is offline JZatopa  United States
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Sorry guys I totally misread something on semisouth's site.


Is Semisouth working on complementary pairs?


I am still a newbie with amp design.

There aren't complementary pairs of semisouth power jfets; does that mean that you can only build single ended ouput amplifiers with what is currently available?
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Old 1st July 2011, 02:58 PM   #10
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No. You still have the ability to build quasi-complimentary amps Like the J2 or Aleph J. THink tube topologies. THere are only N channel equivalent tubes. I have not been doing this long, so i feel for you, but you need to take some time and do some reading. Go to the firstwatt site and read the articles, starting with the Zen amp. Don't breeze through them. Read them until you understand them. If you don't understand something, ask. There are many here to help, even if they do poke fun at you while doing so. Good Luck.
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