Ultima-1 cascode LS-844+MOS 150W amp - diyAudio
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Old 19th November 2003, 02:38 AM   #1
mtlin12 is offline mtlin12  Taiwan
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Default Ultima-1 cascode LS-844+MOS 150W amp

My cascode JFET + MOSFET 150W power amp THD<0.04% at 159W.

Ultima-1 150W

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And my Diamond Buffer Structure DB-01 pre-amp anounced at Head-Fi,

DB-01 on Head-Fi
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Old 19th November 2003, 04:25 AM   #2
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mtlin12,

Nice work. Like the protection circuit you added. And you changed to the Hitachi 2SK214 / 2SJ77. Q9 and Q10 are the LS844. And Q7 and Q8 is also a LS844, I guess.

What is Q1 and Q2? What will you do next? Make more improvements, make something new, or just enjoy the music?



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Old 19th November 2003, 09:16 AM   #3
mtlin12 is offline mtlin12  Taiwan
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JF,

Thank you. The first virsion Q7,Q8 are 2SK246BL as Erno Borbely
suggested, but since
1. 2SK246BL is now lack in Taiwan,
2. 2SK246BL should be matched manually,
so next version you're right ,Q7,Q8 would be LS-844,too.

Ultima-1 is a normal SEPP structure, Q1 and Q2 I use matched
MPS8599, but if you like transistor pair such as 2SA1349,it is no
problem.

In the next version , I will use diamond buffer structure instead of
MOSFET 2SK214/2SJ77, to lower the input capacitance and higher
drive current, to make the amplifier's speed more fast,and of course
to enjoy the music.
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