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Hiraga super class A with SJEP120R100A?
Hiraga super class A with SJEP120R100A?
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Old 18th September 2012, 03:56 AM   #1
rhythmsandy is offline rhythmsandy
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Default Hiraga super class A with SJEP120R100A?

I want to build a Hiraga class A amp but using semi south SJEP120R100A. Can we use this? This transistor has very low distortion figures..
love to use that..

Last edited by rhythmsandy; 18th September 2012 at 04:08 AM.
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Old 18th September 2012, 05:55 AM   #2
kasey197 is offline kasey197
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Hiraga super class A with SJEP120R100A?
which hiraga in particular ?
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Old 18th September 2012, 06:11 AM   #3
rhythmsandy is offline rhythmsandy
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super class A 30Watts
Jean Hiraga's Super Class-A Amplifier
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Old 18th September 2012, 06:11 AM   #4
rhythmsandy is offline rhythmsandy
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i dont think there are complimentary pairs so the design would change...
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Old 18th September 2012, 08:22 AM   #5
kasey197 is offline kasey197
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Hiraga super class A with SJEP120R100A?
Quote:
Originally Posted by rhythmsandy View Post
i dont think there are complimentary pairs so the design would change...
yep no complementary pairs for the semisouth SIC FETs, so M. Hiraga's designs are probably out - except the push-pull nemesis I guess but that needs an output transformer. Maybe he has a quasi-complementary design out there - I guess someone can point that out.

One of Kaneda's amps may suit (schema below) but I'd probably go for one below which is off a japanese guru's site (i forget where i got the link but for sure it was from this forum) - link is: http://www.geocities.jp/mutsu562000/...m/e/hp179e.htm


Little knowledge is a dangerous thing but i *think* youd be able to get to the right ballpark by yanking out (for both fets) the 150R thermistor+100R resistor and replacing with maybe a 500R pot to get the bias correct.....
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Old 18th September 2012, 08:26 AM   #6
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Hiraga super class A with SJEP120R100A?
6L6 started thread about sort of Aleph J with Semisouths

Pa gave him both Jfets and explained sch , on last year's BAF
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